Selzentry Tablet, Film Coated
FDA Label NDC 49702-224

Hepatotoxicity has been reported with use of SELZENTRY. Severe rash or evidence of a systemic allergic reaction (e.g., fever, eosinophilia, or elevated IgE) prior to the development of hepatotoxicity may occur. Patients with signs or symptoms of hepatitis or allergic reaction following use of SELZENTRY should be evaluated immediately [see Warnings and Precautions (5.1)].

SELZENTRY is indicated in combination with other antiretroviral agents for the treatment of only CCR5-tropic human immunodeficiency virus type 1 (HIV-1) infection in patients 2 years of age and older weighing at least 10 kg.

Limitations of Use:

• SELZENTRY is not recommended in patients with dual/mixed- or CXCR4-tropic HIV-1 [see Microbiology (12.4)].

Prior to initiation of SELZENTRY, test all patients for CCR5 tropism using a highly sensitive tropism assay. SELZENTRY is recommended for patients with only CCR5-tropic HIV-1 infection. Outgrowth of pre-existing low-level CXCR4- or dual/mixed-tropic HIV-1 not detected by tropism testing at screening has been associated with virologic failure on SELZENTRY [see Microbiology (12.4), Clinical Studies (14.1)].

Monitor patients for ALT, AST, and bilirubin prior to initiation of SELZENTRY and at other time points during treatment as clinically indicated [see Warnings and Precautions (5.1)].

• SELZENTRY tablets and oral solution are taken twice daily by mouth and may be taken with or without food.
• SELZENTRY must be given in combination with other antiretroviral medications.
• The recommended dosage of SELZENTRY differs based on concomitant medications due to drug interactions.

Table 1 displays oral dosage of SELZENTRY based on different concomitant medications [see Drug Interactions (7.1)].

^a Noninteracting concomitant medications include all medications that are not potent CYP3A inhibitors or inducers.

The recommended dosage of SELZENTRY should be based on body weight (kg) and should not exceed the recommended adult dose. The recommended dosage also differs based on concomitant medications due to drug interactions (Table 2 and Table 3) [see Drug Interactions (7.1), Use in Specific Populations (8.4)].

Before prescribing SELZENTRY tablets, assess children for the ability to swallow tablets. If a child is unable to reliably swallow SELZENTRY tablets, the oral solution formulation should be prescribed. Administer the oral solution using the included press-in bottle adapter and oral dosing syringe.

^a Noninteracting concomitant medications include all medications that are not potent CYP3A inhibitors or inducers.

^a Noninteracting concomitant medications include all medications that are not potent CYP3A inhibitors or inducers.

Adults

Table 4 provides dosing recommendations for patients based on renal function and concomitant medications.

^a Noninteracting concomitant medications include all medications that are not potent CYP3A inhibitors or inducers.

^bThe dosage of SELZENTRY should be reduced to 150 mg twice daily if there are any symptoms of postural hypotension [see Contraindications (4), Warnings and Precautions (5.3)].

Pediatric Patients

There are no data to recommend specific doses of SELZENTRY in pediatric patients with mild or moderate renal impairment [see Use in Specific Populations (8.6)]. Additionally, SELZENTRY is contraindicated for pediatric patients with severe renal impairment or end-stage renal disease (ESRD) on regular hemodialysis who are receiving potent CYP3A inhibitors [see Contraindications (4)].

Tablets:

• 25-mg blue, oval, film-coated tablets debossed with “MVC 25” on one side and plain on the other.
• 75-mg blue, oval, film-coated tablets debossed with “MVC 75” on one side and plain on the other.
• 150-mg blue, oval, film-coated tablets debossed with “MVC 150” on one side and plain on the other.
• 300-mg blue, oval, film-coated tablets debossed with “MVC 300” on one side and plain on the other.

Oral Solution:

• 20 mg per mL clear, colorless, strawberry-flavored oral solution.

SELZENTRY is contraindicated in patients with severe renal impairment or ESRD (CrCl less than 30 mL per minute) who are concomitantly taking potent CYP3A inhibitors or inducers [see Warnings and Precautions (5.3)].

Hepatotoxicity with allergic features including life-threatening events has been reported in clinical trials and postmarketing. Severe rash or evidence of systemic allergic reaction including drug-related rash with fever, eosinophilia, elevated IgE, or other systemic symptoms have been reported in conjunction with hepatotoxicity [see Warnings and Precautions (5.2)]. These events occurred approximately 1 month after starting treatment. Among reported cases of hepatitis, some were observed in the absence of allergic features or with no pre-existing hepatic disease.

Appropriate laboratory testing including ALT, AST, and bilirubin should be conducted prior to initiating therapy with SELZENTRY and at other time points during treatment as clinically indicated. Hepatic laboratory parameters should be obtained in any patient who develops rash, or signs or symptoms of hepatitis, or allergic reaction. Discontinuation of SELZENTRY should be considered in any patient with signs or symptoms of hepatitis, or with increased liver transaminases combined with rash or other systemic symptoms.

When administering SELZENTRY to patients with pre-existing liver dysfunction or who are co-infected with hepatitis B and/or C virus, additional monitoring may be warranted. The safety and efficacy of SELZENTRY have not been specifically studied in patients with significant underlying liver disorders.

Severe, potentially life-threatening skin and hypersensitivity reactions have been reported in patients taking SELZENTRY, in most cases concomitantly with other drugs associated with these reactions. These include cases of Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and drug rash with eosinophilia and systemic symptoms (DRESS) [see Adverse Reactions (6.3)]. The cases were characterized by features including rash, constitutional findings, and sometimes organ dysfunction, including hepatic failure. Discontinue SELZENTRY and other suspected agents immediately if signs or symptoms of severe skin or hypersensitivity reactions develop (including, but not limited to, severe rash or rash accompanied by fever, malaise, muscle or joint aches, blisters, oral lesions, conjunctivitis, facial edema, lip swelling, eosinophilia). Delay in stopping treatment with SELZENTRY or other suspect drugs after the onset of rash may result in a life-threatening reaction. Clinical status, including liver aminotransferases, should be monitored and appropriate therapy initiated.

Eleven subjects (1.3%) who received SELZENTRY had cardiovascular events, including myocardial ischemia and/or infarction, during the Phase 3 trials in treatment-experienced subjects (total exposure 609 patient-years [300 on SELZENTRY once daily + 309 on SELZENTRY twice daily]), while no subjects who received placebo had such events (total exposure 111 patient-years). These subjects generally had cardiac disease or cardiac risk factors prior to use of SELZENTRY, and the relative contribution of SELZENTRY to these events is not known.

In the Phase 2b/3 trial in treatment-naive adult subjects, 3 subjects (0.8%) who received SELZENTRY had events related to ischemic heart disease and 5 subjects (1.4%) who received efavirenz had such events (total exposure 506 and 508 patient-years for SELZENTRY and efavirenz, respectively).

When SELZENTRY was administered to healthy volunteers at doses higher than the recommended dose, symptomatic postural hypotension was seen at a greater frequency than in placebo. However, when SELZENTRY was given at the recommended dose in HIV-1-infected adult subjects in Phase 3 trials, postural hypotension was seen at a rate similar to placebo (approximately 0.5%).

Patients with cardiovascular comorbidities, risk factors for postural hypotension, or receiving concomitant medication known to lower blood pressure, could be at increased risk of cardiovascular adverse events triggered by postural hypotension. Additional monitoring may be warranted.

Postural Hypotension in Patients with Renal Impairment

An increased risk of postural hypotension may occur in patients with severe renal insufficiency or in those with ESRD due to increased maraviroc exposure in some patients. SELZENTRY should be used in patients with severe renal impairment or ESRD only if they are not receiving a concomitant potent CYP3A inhibitor or inducer. However, the use of SELZENTRY in these patients should only be considered when no alternative treatment options are available. If adult patients with severe renal impairment or ESRD experience any symptoms of postural hypotension while taking 300 mg twice daily, the dose should be reduced to 150 mg twice daily [see Dosage and Administration (2.5)].

Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral therapy, including SELZENTRY. During the initial phase of combination antiretroviral treatment, patients whose immune systems respond may develop an inflammatory response to indolent or residual opportunistic infections (such as infection with Mycobacterium avium infection, cytomegalovirus, Pneumocystisjirovecii pneumonia [PCP], tuberculosis, or reactivation of Herpessimplex and Herpeszoster), which may necessitate further evaluation and treatment.

Autoimmune disorders (such as Graves’ disease, polymyositis, and Guillain-Barré syndrome) have also been reported to occur in the setting of immune reconstitution; however, the time to onset is more variable, and can occur many months after initiation of treatment.

SELZENTRY antagonizes the CCR5 co-receptor located on some immune cells, and therefore could potentially increase the risk of developing infections. The overall incidence and severity of infection, as well as AIDS-defining category C infections, were comparable in the treatment groups during the Phase 3 adult treatment-experienced trials of SELZENTRY. While there was a higher rate of certain upper respiratory tract infections reported in the treatment arm receiving SELZENTRY compared with placebo (23% versus 13%), there was a lower rate of pneumonia (2% versus 5%) reported in subjects receiving SELZENTRY. A higher incidence of Herpes virus infections (11 per 100 patient-years) was also reported in the treatment arm receiving SELZENTRY when adjusted for exposure compared with placebo (8 per 100 patient-years).

In the Phase 2b/3 trial in treatment-naive adult subjects, the incidence of AIDS-defining Category C events when adjusted for exposure was 1.8 for SELZENTRY compared with 2.4 for efavirenz per 100 patient-years of exposure.

Patients should be monitored closely for evidence of infections while receiving SELZENTRY.

While no increase in malignancy has been observed with SELZENTRY, due to this drug’s mechanism of action, it could affect immune surveillance and lead to an increased risk of malignancy.

The exposure-adjusted rate for malignancies per 100 patient-years of exposure in adult treatment-experienced trials was 4.6 for SELZENTRY compared with 9.3 on placebo. In treatment-naive adult subjects, the rates were 1.0 and 2.4 per 100 patient-years of exposure for SELZENTRY and efavirenz, respectively.

Long-term follow-up is needed to more fully assess this risk.

The following adverse reactions are discussed in other sections of the labeling:

• Hepatotoxicity [see Boxed Warning, Warnings and Precautions (5.1)]
• Severe Skin and Hypersensitivity Reactions [see Warnings and Precautions (5.2)]
• Cardiovascular Events [see Warnings and Precautions (5.3)]

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the rates observed in practice.

Adverse Reactions in Adult Subjects

Treatment-Experienced Subjects: The safety profile of SELZENTRY is primarily based on 840 HIV-1-infected subjects who received at least 1 dose of SELZENTRY during two Phase 3 trials. A total of 426 of these subjects received the indicated twice-daily dosing regimen.

Assessment of treatment-emergent adverse events is based on the pooled data from 2 trials in subjects with CCR5-tropic HIV-1 (A4001027 and A4001028). The median duration of therapy with SELZENTRY for subjects in these trials was 48 weeks, with the total exposure on SELZENTRY twice daily at 309 patient-years versus 111 patient-years on placebo each administered with optimized background therapy (OBT). The population was 89% male and 84% white, with mean age of 46 years (range: 17 to 75 years). Subjects received dose equivalents of 300 mg maraviroc once or twice daily.

The most common adverse events reported with twice-daily therapy with SELZENTRY with frequency rates higher than placebo, regardless of causality, were upper respiratory tract infections, cough, pyrexia, rash, and dizziness. In these 2 trials, the rate of discontinuation due to adverse events was 5% for subjects who received SELZENTRY twice daily + OBT as well as those who received placebo + OBT. Most of the adverse events reported were judged to be mild to moderate in severity. The data described below occurred with twice-daily dosing of SELZENTRY.

The total numbers of subjects reporting infections were 233 (55%) and 84 (40%) in the group receiving SELZENTRY twice daily and the placebo group, respectively. Correcting for the longer duration of exposure on SELZENTRY compared with placebo, the exposure-adjusted frequency (rate per 100 subject-years) of these events was 133 for both SELZENTRY twice daily and placebo.

Dizziness or postural dizziness occurred in 8% of subjects on either SELZENTRY or placebo, with 2 subjects (0.5%) on SELZENTRY permanently discontinuing therapy (1 due to syncope, 1 due to orthostatic hypotension) versus 1 subject on placebo (0.5%) permanently discontinuing therapy due to dizziness.

Treatment-emergent adverse events, regardless of causality, from Trials A4001027 and A4001028 are summarized in Table 5. Selected events occurring at greater than or equal to 2% of subjects and at a numerically higher rate in subjects treated with SELZENTRY are included; events that occurred at the same or higher rate on placebo are not displayed.

^a300-mg dose equivalent. 

^bPYE = Patient-years of exposure.

Laboratory Abnormalities: Table 6 shows the treatment-emergent Grade 3-4 laboratory abnormalities that occurred in greater than 2% of subjects receiving SELZENTRY.

^a Percentages based on total subjects evaluated for each laboratory parameter.

ULN=Upper limit of normal.

Treatment‑Naive Subjects: Treatment‑Emergent Adverse Events: Treatment‑emergent adverse events, regardless of causality, from Trial A4001026, a double‑blind, comparative, controlled trial in which 721 treatment‑naive subjects received SELZENTRY 300 mg twice daily (n = 360) or efavirenz 600 mg once daily (n = 361) in combination with lamivudine/zidovudine (COMBIVIR^®) for 96 weeks, are summarized in Table 7. Selected events occurring in greater than or equal to 2% of subjects and at a numerically higher rate in subjects treated with SELZENTRY are included; events that occurred at the same or higher rate on efavirenz are not displayed.

Laboratory Abnormalities:

^a n = Total number of subjects evaluable for laboratory abnormalities.

ULN=Upper limit of normal.

Percentages based on total subjects evaluated for each laboratory parameter. If the same subject in a given treatment group had greater than 1 occurrence of the same abnormality, only the most severe is counted.

Less Common Adverse Events in Clinical Trials: The following adverse events occurred in less than 2% of subjects treated with SELZENTRY or at a rate similar to the comparator. These events have been included because of their seriousness and either increased frequency on SELZENTRY or are potential risks due to the mechanism of action. Events attributed to the subjects’ underlying HIV-1 infection are not listed.

Blood and Lymphatic System: Marrow depression and hypoplastic anemia.

Cardiac Disorders: Unstable angina, acute cardiac failure, coronary artery disease, coronary artery occlusion, myocardial infarction, myocardial ischemia.

Hepatobiliary Disorders: Hepatic cirrhosis, hepatic failure, cholestatic jaundice, portal vein thrombosis, jaundice.

Infections and Infestations: Endocarditis, infective myositis, viral meningitis, pneumonia, treponema infections, septic shock, Clostridium difficile colitis, meningitis.

Musculoskeletal and Connective Tissue Disorders: Myositis, osteonecrosis, rhabdomyolysis, blood CK increased.

Neoplasms Benign, Malignant, and Unspecified (Including Cysts and Polyps): Abdominal neoplasm, anal cancer, basal cell carcinoma, Bowen’s disease, cholangiocarcinoma, diffuse large B-cell lymphoma, lymphoma, metastases to liver, esophageal carcinoma, nasopharyngeal carcinoma, squamous cell carcinoma, squamous cell carcinoma of skin, tongue neoplasm (malignant stage unspecified), anaplastic large cell lymphomas T- and null-cell types, bile duct neoplasms malignant, endocrine neoplasms malignant and unspecified.

Nervous System Disorders: Cerebrovascular accident, convulsions and epilepsy, tremor (excluding congenital), facial palsy, hemianopia, loss of consciousness, visual field defect.

Clinical Trials Experience in Pediatric Subjects

Trial A4001031 is an open-label trial in which 103 treatment-experienced, CCR5-tropic, HIV-1–infected pediatric subjects aged 2 to less than 18 years weighing at least 10 kg received SELZENTRY twice daily in combination with OBT. The dose of SELZENTRY was based on body surface area (BSA) and on whether the subject was receiving potent CYP3A inhibitors and/or inducers. The median duration of therapy with SELZENTRY was 131 weeks with 72% of subjects receiving study treatment for greater than 48 weeks and 62% of subjects receiving study treatment for 96 weeks.

In these 103 children and adolescents, the safety profile through 96 weeks was similar to that for adults. Most of the adverse reactions reported were mild to moderate; severe (Grade 3 and 4) adverse reactions occurred in 2% of subjects. The most common adverse reactions (all grades) reported with twice-daily therapy with SELZENTRY, were vomiting (12%), abdominal pain (4%), diarrhea (4%), nausea (4%), and dizziness (3%). Three subjects (3%) discontinued due to adverse events.

Maraviroc-related gastrointestinal adverse events through 48 weeks (nausea, vomiting, diarrhea, constipation, and abdominal pain/cramps) were observed more commonly in subjects who received the SELZENTRY oral solution (21%) compared with those who received SELZENTRY tablets (16%). Subjects were permitted to change formulations after Week 48.

The following adverse events have been identified during post-approval use of SELZENTRY. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Skin and Subcutaneous Tissue Disorders

Stevens‑Johnson syndrome (SJS), drug rash with eosinophilia and systemic symptoms (DRESS), toxic epidermal necrolysis (TEN).

Maraviroc is a substrate of CYP3A and P-glycoprotein (P-gp) and its pharmacokinetics are likely to be modulated by inhibitors and inducers of these enzymes/transporters. Therefore, a dosage adjustment may be required when maraviroc is coadministered with those drugs [see Dosage and Administration (2.3, 2.4)].

Concomitant use of maraviroc and St. John's wort (Hypericum perforatum) or products containing St. John's wort is not recommended. Coadministration of maraviroc with St. John's wort is expected to substantially decrease maraviroc concentrations and may result in suboptimal levels of maraviroc and lead to loss of virologic response and possible resistance to maraviroc.

Additional drug interaction information is available [see Clinical Pharmacology (12.3)].

Pregnancy Exposure Registry

There is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to SELZENTRY during pregnancy. Physicians are encouraged to register patients by calling the Antiretroviral Pregnancy Registry (APR) at 1-800-258-4263.

Risk Summary

Limited data on the use of SELZENTRY during pregnancy from the APR and case reports are not sufficient to inform a drug-associated risk of birth defects and miscarriage. In animal reproduction studies, no evidence of adverse developmental outcomes was observed with maraviroc. During organogenesis in the rat and rabbit, systemic exposures (AUC) to maraviroc were approximately 20 times (rats) and 5 times (rabbits) the exposure in humans at the recommended 300-mg twice-daily dose. In the rat pre- and post-natal development study, maternal systemic exposure (AUC) to maraviroc was approximately 14 times the exposure in humans at the recommended 300-mg twice-daily dose [seeData].

The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.

Data

Animal Data: Maraviroc was administered orally to pregnant rats (up to 1,000 mg per kg per day) and rabbits (up to 75 mg per kg per day) on gestation Days 6 to 17 and 7 to 19, respectively. No adverse effects on embryo-fetal development were observed at these dose levels, resulting in exposures (AUC) approximately 20 times (rats) and 5 times (rabbits) higher than human exposures at the recommended daily dose. In the rat pre- and post-natal development study, maraviroc was administered orally at up to 1,000 mg per kg per day on gestation Day 6 to lactation/post-partum Day 20, with development of the offspring (including fertility and reproductive performance) unaffected by maternal administration of maraviroc at an exposure (AUC) approximately 14 times higher than human exposure at the recommended daily dose.

Risk Summary

The Centers for Disease Control and Prevention recommend that HIV‑1-infected mothers in the United States not breastfeed their infants to avoid risking postnatal transmission of HIV‑1 infection.

There are no data on the presence of maraviroc in human milk, the effects on the breastfed infant, or the effects on milk production. When administered to lactating rats, maraviroc was present in milk [see Data]. Because of the potential for (1) HIV transmission (in HIV-negative infants), (2) developing viral resistance (in HIV-positive infants), and (3) serious adverse reactions in a breastfed infant similar to those seen in adults, instruct mothers not to breastfeedif they are receiving SELZENTRY.

Data

Maraviroc (and related metabolites) was excreted into the milk of lactating rats following a single oral dose of maraviroc (100 mg per kg) on lactation Day 12, with a maximal milk concentration achieved one hour post-administration at a milk concentration approximately 2.5 times that of maternal plasma concentrations.

The safety, pharmacokinetic (PK) profile, and antiviral activity of SELZENTRY were evaluated in treatment-experienced, CCR5-tropic, HIV-1-infected pediatric subjects aged 2 to less than 18 years weighing at least 10 kg in an open-label, multicenter clinical trial, A4001031 [see Adverse Reactions (6.1), Clinical Studies (14.2)]. Pharmacokinetics were evaluated in a total of 98 pediatric subjects: 85 subjects received SELZENTRY and concomitant medications that included potent CYP3A inhibitors with or without potent CYP3A inducers, 10 subjects received SELZENTRY and noninteracting medications (not containing potent CYP3A inhibitors or potent CYP3A inducers), and three subjects received SELZENTRY and medications that included potent CYP3A inducers without potent CYP3A inhibitors [see Clinical Pharmacology (12.3)].

See Dosage and Administration (2.4, 2.5) for dosing recommendations for pediatric patients aged 2 years and older and weighing at least 10 kg. The pharmacokinetics, safety, and efficacy of maraviroc in patients younger than 2 years have not been established. Therefore, SELZENTRY is not recommended in this patient population. Additionally, there are insufficient data to make dosing recommendations for use of SELZENTRY in pediatric patients concomitantly receiving noninteracting medications and weighing less than 30 kg or in pediatric patients concomitantly receiving potent CYP3A inducers without a potent CYP3A inhibitor [see Dosage and Administration (2.4, 2.5)].

There were insufficient numbers of subjects aged 65 and over in the clinical trials to determine whether they respond differently from younger subjects. In general, caution should be exercised when administering SELZENTRY in elderly patients, also reflecting the greater frequency of decreased hepatic and renal function, of concomitant disease and other drug therapy.

Recommended doses of SELZENTRY for adult patients with impaired renal function (CrCl less than or equal to 80 mL per minute) are based on the results of a pharmacokinetic trial conducted in healthy adult subjects with various degrees of renal impairment. Maraviroc has not been studied in pediatric patients with renal impairment. There are no data to recommend specific doses of SELZENTRY in pediatric patients with mild to moderate renal impairment [see Use in Specific Populations (8.4)]. SELZENTRY is contraindicated in pediatric patients with severe renal impairment or ESRD on regular hemodialysis who are receiving potent CYP3A inhibitors [see Contraindications (4)].

The pharmacokinetics of maraviroc in adult subjects with mild and moderate renal impairment was similar to that in subjects with normal renal function [see Clinical Pharmacology (12.3)]. A limited number of adult subjects with mild and moderate renal impairment in the Phase 3 clinical trials (n = 131 and n = 12, respectively) received the same dose of SELZENTRY as that administered to subjects with normal renal function. In these subjects there was no apparent difference in the adverse event profile for maraviroc compared with subjects with normal renal function.

If adult patients with severe renal impairment or ESRD not receiving a concomitant potent CYP3A inhibitor or inducer experience any symptoms of postural hypotension while taking SELZENTRY 300 mg twice daily, the dose should be reduced to 150 mg twice daily. No trials have been performed in subjects with severe renal impairment or ESRD co-treated with potent CYP3A inhibitors or inducers. Hence, no dose of SELZENTRY can be recommended, and SELZENTRY is contraindicated for these patients [see Dosage and Administration (2.3), Contraindications (4), Warnings and Precautions (5.3), Clinical Pharmacology (12.3)].

Maraviroc is principally metabolized by the liver; therefore, when administering this drug to patients with hepatic impairment, maraviroc concentrations may be increased. Maraviroc concentrations are higher when SELZENTRY 150 mg is administered with a potent CYP3A inhibitor compared with following administration of 300 mg without a CYP3A inhibitor, so patients with moderate hepatic impairment who receive SELZENTRY 150 mg with a potent CYP3A inhibitor should be monitored closely for maraviroc-associated adverse events. Maraviroc has not been studied in subjects with severe hepatic impairment or in pediatric patients with any degree of hepatic impairment [see Warnings and Precautions (5.1), Clinical Pharmacology (12.3)].

Population pharmacokinetic analysis of pooled Phase 1/2a data indicated gender (female: n = 96, 23.2% of the total population) does not affect maraviroc concentrations. Dosage adjustment based on gender is not necessary.

Population pharmacokinetic analysis of pooled Phase 1/2a data indicated exposure was 26.5% higher in Asians (n = 95) as compared with non-Asians (n = 318). However, a trial designed to evaluate pharmacokinetic differences between whites (n = 12) and Singaporeans (n = 12) showed no difference between these 2 populations. No dose adjustment based on race is needed.

The highest single dose administered in clinical trials was 1,200 mg. The dose-limiting adverse event was postural hypotension, which was observed at 600 mg. While the recommended dose for SELZENTRY in patients receiving a CYP3A inducer without a CYP3A inhibitor is 600 mg twice daily, this dose is appropriate due to enhanced metabolism.

Prolongation of the QT interval was seen in dogs and monkeys at plasma concentrations 6 and 12 times, respectively, those expected in humans at the intended exposure of 300-mg equivalents twice daily. However, no significant QT prolongation was seen in the trials in treatment-experienced subjects with HIV using the recommended doses of maraviroc, or in a specific pharmacokinetic trial to evaluate the potential of maraviroc to prolong the QT interval [see Clinical Pharmacology (12.3)].

There is no specific antidote for overdose with maraviroc. Treatment of overdose should consist of general supportive measures including keeping the patient in a supine position, careful assessment of patient vital signs, blood pressure, and ECG.

Administration of activated charcoal may also be used to aid in removal of unabsorbed drug. Hemodialysis had a minimal effect on maraviroc clearance and exposure in a trial in subjects with ESRD [see Clinical Pharmacology (12.3)].

SELZENTRY (maraviroc) is a selective, slowly reversible, small molecule antagonist of the interaction between human CCR5 and HIV-1 gp120. Blocking this interaction prevents CCR5-tropic HIV-1 entry into cells.

SELZENTRY film-coated tablets for oral administration contain 25, 75, 150, or 300 mg of maraviroc and the following inactive ingredients: dibasic calcium phosphate (anhydrous), magnesium stearate, microcrystalline cellulose, and sodium starch glycolate. The film coat (Opadry^® II Blue [85G20583]) contains FD&C blue #2 aluminum lake, soya lecithin, polyethylene glycol (macrogol 3350), polyvinyl alcohol, talc, and titanium dioxide.

SELZENTRY oral solution contains 20 mg per mL of maraviroc and the following inactive ingredients: citric acid (anhydrous), purified water, sodium benzoate, sodium citrate dihydrate, strawberry flavoring (501440T), and sucralose.

Maraviroc is chemically described as 4,4-difluoro-N-{(1S)-3-[exo-3-(3-isopropyl-5-methyl-4H-1,2,4-triazol-4-yl)-8-azabicyclo[3.2.1]oct-8-yl]-1-phenylpropyl}cyclohexanecarboxamide.

The molecular formula is C₂₉H₄₁F₂N₅O and the structural formula is:

Chemical Structure (Selzentry Spl Graphic 01)

Maraviroc is a white to pale-colored powder with a molecular weight of 513.67. It is highly soluble across the physiological pH range (pH 1.0 to 7.5).

Maraviroc is an HIV-1 antiviral drug [see Microbiology (12.4)].

Exposure-Response Relationship in Treatment-Experienced Adult Subjects

The relationship between maraviroc, modeled plasma trough concentration (C_min) (1 to 9 samples per subject taken on up to 7 visits), and virologic response was evaluated in 973 treatment-experienced HIV-1-infected subjects with varied optimized background antiretroviral regimens in Trials A4001027 and A4001028. The C_min, baseline viral load, baseline CD4⁺ cell count, and overall sensitivity score (OSS) were found to be important predictors of virologic success (defined as viral load less than 400 copies per mL at 24 weeks). Table 9 illustrates the proportions of subjects with virologic success (%) within each C_min quartile for 150-mg twice-daily and 300-mg twice-daily groups.

Exposure-Response Relationship in Treatment-Naive Adult Subjects

The relationship between maraviroc, modeled plasma trough concentration (C_min) (1 to 12 samples per subject taken on up to 8 visits), and virologic response was evaluated in 294 treatment-naive HIV–1-infected subjects receiving maraviroc 300 mg twice daily in combination with lamivudine/zidovudine in Trial A4001026. Table 10 illustrates the proportion (%) of subjects with virologic success less than 50 copies per mL at 48 weeks within each C_min quartile for the 300-mg twice-daily dose.

Eighteen of 75 (24%) subjects in Q1 had no measurable maraviroc concentration on at least one occasion versus 1 of 73 and 1 of 74 in Q3 and Q4, respectively.

Effects on Electrocardiogram

A placebo-controlled, randomized, crossover trial to evaluate the effect on the QT interval of healthy male and female volunteers was conducted with 3 single oral doses of maraviroc and moxifloxacin. The placebo-adjusted mean maximum (upper 1-sided 95% CI) increases in QTc from baseline after 100, 300, and 900 mg of maraviroc were –2 (0), -1 (1), and 1 (3) msec, respectively, and 13 (15) msec for moxifloxacin 400 mg. No subject in any group had an increase in QTc of greater than or equal to 60 msec from baseline. No subject experienced an interval exceeding the potentially clinically relevant threshold of 500 msec.

Table 11. Mean Maraviroc Pharmacokinetic Parameters in Adults

^aThe estimated exposure is lower compared with other trials possibly due to sparse sampling, food effect, compliance, and concomitant medications.

Absorption

Peak maraviroc plasma concentrations are attained 0.5 to 4 hours following single oral doses of 1 to 1,200 mg administered to uninfected volunteers. The pharmacokinetics of oral maraviroc are not dose proportional over the dose range.

The absolute bioavailability of a 100‑mg dose is 23% and is predicted to be 33% at 300 mg. Maraviroc is a substrate for the efflux transporter P-gp.

Effect of Food on Oral Absorption

Coadministration of a 300‑mg tablet with a high‑fat breakfast reduced maraviroc C_max and AUC by 33% and coadministration of 75 mg of oral solution with a high-fat breakfast reduced maraviroc AUC by 73% in healthy adult volunteers. Studies with the tablet formulation demonstrated a reduced food effect at higher doses.

There were no food restrictions in the adult trials (using the tablet formulation) or in the pediatric trial (using both tablet and oral solution formulations) that demonstrated the efficacy/antiviral activity and safety of maraviroc [see Clinical Studies (14.1, 14.2)].

Distribution

Maraviroc is bound (approximately 76%) to human plasma proteins, and shows moderate affinity for albumin and alpha‑1 acid glycoprotein. The volume of distribution of maraviroc is approximately 194 L.

Metabolism

Trials in humans and in vitro studies using human liver microsomes and expressed enzymes have demonstrated that maraviroc is principally metabolized by the cytochrome P450 system to metabolites that are essentially inactive against HIV‑1. In vitro studies indicate that CYP3A is the major enzyme responsible for maraviroc metabolism. In vitro studies also indicate that polymorphic enzymes CYP2C9, CYP2D6, and CYP2C19 do not contribute significantly to the metabolism of maraviroc.

Maraviroc is the major circulating component (~42% drug‑related radioactivity) following a single oral dose of 300 mg [¹⁴C]-maraviroc. The most significant circulating metabolite in humans is a secondary amine (~22% radioactivity) formed by N‑dealkylation. This polar metabolite has no significant pharmacological activity. Other metabolites are products of mono‑oxidation and are only minor components of plasma drug‑related radioactivity.

Excretion

The terminal half‑life of maraviroc following oral dosing to steady state in healthy subjects was 14 to 18 hours. A mass balance/excretion trial was conducted using a single 300‑mg dose of ¹⁴C-labeled maraviroc. Approximately 20% of the radiolabel was recovered in the urine and 76% was recovered in the feces over 168 hours. Maraviroc was the major component present in urine (mean of 8% dose) and feces (mean of 25% dose). The remainder was excreted as metabolites.

Special Populations

Hepatic Impairment: Maraviroc is primarily metabolized and eliminated by the liver. A trial compared the pharmacokinetics of a single 300‑mg dose of SELZENTRY in subjects with mild (Child‑Pugh Class A, n = 8) and moderate (Child‑Pugh Class B, n = 8) hepatic impairment with pharmacokinetics in healthy subjects (n = 8). The mean C_max and AUC were 11% and 25% higher, respectively, for subjects with mild hepatic impairment, and 32% and 46% higher, respectively, for subjects with moderate hepatic impairment compared with subjects with normal hepatic function. These changes do not warrant a dose adjustment. Maraviroc concentrations are higher when SELZENTRY 150 mg is administered with a potent CYP3A inhibitor compared with following administration of 300 mg without a CYP3A inhibitor, so patients with moderate hepatic impairment who receive SELZENTRY 150 mg with a potent CYP3A inhibitor should be monitored closely for maraviroc‑associated adverse events. The pharmacokinetics of maraviroc have not been studied in subjects with severe hepatic impairment [see Warnings and Precautions (5.1)].

Renal Impairment: A trial compared the pharmacokinetics of a single 300‑mg dose of SELZENTRY in adult subjects with severe renal impairment (CrCl less than 30 mL per minute, n = 6) and ESRD (n = 6) with healthy volunteers (n = 6). Geometric mean ratios for maraviroc C_max and AUC_inf were 2.4‑fold and 3.2‑fold higher, respectively, for subjects with severe renal impairment, and 1.7‑fold and 2.0‑fold higher, respectively, for subjects with ESRD as compared with subjects with normal renal function in this trial. Hemodialysis had a minimal effect on maraviroc clearance and exposure in subjects with ESRD. Exposures observed in subjects with severe renal impairment and ESRD were within the range observed in previous 300‑mg single‑dose trials of SELZENTRY in healthy volunteers with normal renal function. However, maraviroc exposures in the subjects with normal renal function in this trial were 50% lower than those observed in previous trials. Based on the results of this trial, no dose adjustment is recommended for patients with renal impairment receiving SELZENTRY without a potent CYP3A inhibitor or inducer. However, if patients with severe renal impairment or ESRD experience any symptoms of postural hypotension while taking SELZENTRY 300 mg twice daily, their dose should be reduced to 150 mg twice daily [see Dosage and Administration (2.3), Warnings and Precautions (5.3)].

In addition, the trial compared the pharmacokinetics of multiple‑dose SELZENTRY in combination with saquinavir/ritonavir 1,000/100 mg twice daily (a potent CYP3A inhibitor combination) for 7 days in subjects with mild renal impairment (CrCl greater than 50 and less than or equal to 80 mL per minute, n = 6) and moderate renal impairment (CrCl greater than or equal to 30 and less than or equal to 50 mL per minute, n = 6) with healthy volunteers with normal renal function (n = 6). Subjects received 150 mg of SELZENTRY at different dose frequencies (healthy volunteers – every 12 hours; mild renal impairment – every 24 hours; moderate renal impairment – every 48 hours). Compared with healthy volunteers (dosed every 12 hours), geometric mean ratios for maraviroc AUC_tau, C_max, and C_min were 50% higher, 20% higher, and 43% lower, respectively, for subjects with mild renal impairment (dosed every 24 hours). Geometric mean ratios for maraviroc AUC_tau, C_max, and C_min were 16% higher, 29% lower, and 85% lower, respectively, for subjects with moderate renal impairment (dosed every 48 hours) compared with healthy volunteers (dosed every 12 hours). Based on the data from this trial, no adjustment in dose is recommended for patients with mild or moderate renal impairment [see Dosage and Administration (2.3)].

Pediatric Patients: The pharmacokinetics of maraviroc were evaluated in CCR5-tropic, HIV-1–infected, treatment-experienced pediatric subjects aged 2 to less than 18 years. In the dose-finding stage of Trial A4001031, doses were administered with food on intensive PK evaluation days and optimized to achieve an average concentration over the dosing interval (C_avg) of greater than 100 ng per mL. Throughout the trial, on non-intensive PK evaluation days maraviroc was taken with or without food. The initial dose of maraviroc was based on BSA and concomitant medication category (i.e., presence of CYP3A inhibitors and/or inducers). The conversion of dosing to a weight (kg)-band basis in children provides comparable exposures with those observed in the trial at the corresponding BSA.

Maraviroc pharmacokinetic parameters in pediatric subjects receiving potent CYP3A inhibitors with or without a potent CYP3A inducer (Table 12) and in subjects weighing greater than or equal to 30 kg and receiving noninteracting concomitant medications (Table 13) were similar to those observed in adults. Insufficient pharmacokinetic data are available to make a comparison between adults and pediatric subjects weighing less than 30 kg and receiving noninteracting concomitant medications or between adult and pediatric subjects receiving concomitant medications consisting of a potent CYP3A inducer without CYP3A inhibitor.

^a The covariate distribution of the study population of 85 subjects on CYP3A-inhibitor-containing regimens was randomly sampled with replacement to obtain 1,000 subjects. Shown in the table are model-predicted steady-state PK parameters for the 1,000 subjects in the simulation dataset.

^a Noninteracting concomitant medications include all medications that are not potent CYP3A inhibitors or inducers.

^b Nine observations from 5 subjects.

Effect of Concomitant Drugs on the Pharmacokinetics of Maraviroc

Maraviroc is a substrate of CYP3A and P-gp and hence its pharmacokinetics are likely to be modulated by inhibitors and inducers of these enzymes/transporters. The CYP3A/P-gp inhibitors ketoconazole, boceprevir, lopinavir/ritonavir, ritonavir, darunavir/ritonavir, saquinavir/ritonavir, and atazanavir ± ritonavir all increased the C_max and AUC of maraviroc (Table 14). The CYP3A inducers rifampin, etravirine, and efavirenz decreased the C_max and AUC of maraviroc (Table 14).

Tipranavir/ritonavir (net CYP3A inhibitor/P-gp inducer) did not affect the steady‑state pharmacokinetics of maraviroc (Table 14). Cotrimoxazole and tenofovir did not affect the pharmacokinetics of maraviroc.

Table 14. Effect of Coadministered Agents on the Pharmacokinetics of Maraviroc

^aCompared with historical data.

Effect of Maraviroc on the Pharmacokinetics of Concomitant Drugs

Maraviroc is unlikely to inhibit the metabolism of coadministered drugs metabolized by the following cytochrome P enzymes (CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, and CYP3A) because maraviroc did not inhibit activity of those enzymes at clinically relevant concentrations in vitro. Maraviroc does not induce CYP1A2 in vitro.

In vitro results suggest that maraviroc could inhibit P-gp in the gut. However, maraviroc did not significantly affect the pharmacokinetics of digoxin in vivo, indicating maraviroc may not significantly inhibit or induce P-gp clinically.

Drug interaction trials were performed with maraviroc and other drugs likely to be coadministered or commonly used as probes for pharmacokinetic interactions (Table 14).

Coadministration of fosamprenavir 700 mg/ritonavir 100 mg twice daily and maraviroc 300 mg twice daily decreased the C_min and AUC of amprenavir by 36% and 35%, respectively. Coadministration of fosamprenavir 1,400 mg/ritonavir 100 mg once daily and maraviroc 300 mg once daily decreased the C_min and AUC by 15% and 30%, respectively. No dosage adjustment is necessary when SELZENTRY is dosed 150 mg twice daily in combination with fosamprenavir/ritonavir dosed once or twice daily. Fosamprenavir should be given with ritonavir when coadministered with SELZENTRY.

Maraviroc had no significant effect on the pharmacokinetics of elvitegravir, boceprevir, zidovudine, or lamivudine. Maraviroc decreased the C_min and AUC of raltegravir by 27% and 37%, respectively, which is not clinically significant. Maraviroc had no clinically relevant effect on the pharmacokinetics of midazolam, the oral contraceptives ethinylestradiol and levonorgestrel, no effect on the urinary 6β-hydroxycortisol/cortisol ratio, suggesting no induction of CYP3A in vivo. Maraviroc had no effect on the debrisoquine metabolic ratio (MR) at 300 mg twice daily or less in vivo and did not cause inhibition of CYP2D6 in vitro until concentrations greater than 100 microM. However, there was 234% increase in debrisoquine MR on treatment compared with baseline at 600 mg once daily, suggesting potential inhibition of CYP2D6 at higher doses.

Mechanism of Action

Maraviroc is a member of a therapeutic class called CCR5 co-receptor antagonists. Maraviroc selectively binds to the human chemokine receptor CCR5 present on the cell membrane, preventing the interaction of HIV-1 gp120 and CCR5 necessary for CCR5-tropic HIV-1 to enter cells. CXCR4-tropic and dual-tropic HIV-1 entry is not inhibited by maraviroc.

Antiviral Activity in Cell Culture

Maraviroc inhibits the replication of CCR5-tropic laboratory strains and primary isolates of HIV-1 in models of acute peripheral blood leukocyte infection. The mean EC₅₀ value (50% effective concentration) for maraviroc against HIV-1 group M isolates (subtypes A to J and circulating recombinant form AE) and group O isolates ranged from 0.1 to 4.5 nM (0.05 to 2.3 ng per mL) in cell culture.

When used with other antiretroviral agents in cell culture, the combination of maraviroc was not antagonistic with non-nucleoside reverse transcriptase inhibitors (NNRTIs: delavirdine, efavirenz, and nevirapine), NRTIs (abacavir, didanosine, emtricitabine, lamivudine, stavudine, tenofovir, zalcitabine, and zidovudine), or protease inhibitors (PIs: amprenavir, atazanavir, darunavir, indinavir, lopinavir, nelfinavir, ritonavir, saquinavir, and tipranavir). Maraviroc was not antagonistic with the HIV fusion inhibitor enfuvirtide. Maraviroc was not active against CXCR4-tropic and dual-tropic viruses (EC₅₀ value greater than 10 microM). The antiviral activity of maraviroc against HIV-2 has not been evaluated.

Resistance in Cell Culture: HIV-1 variants with reduced susceptibility to maraviroc have been selected in cell culture following serial passage of 2 CCR5-tropic viruses (CC1/85 and RU570). The maraviroc-resistant viruses remained CCR5-tropic with no evidence of a change from a CCR5-tropic virus to a CXCR4-using virus. Two amino acid residue substitutions in the V3-loop region of the HIV-1 envelope glycoprotein (gp160), A316T, and I323V (HXB2 numbering), were shown to be necessary for the maraviroc-resistant phenotype in the HIV-1 isolate CC1/85. In the RU570 isolate a 3-amino acid residue deletion in the V3 loop, ΔQAI (HXB2 positions 315 to 317), was associated with maraviroc resistance. The relevance of the specific gp120 substitutions observed in maraviroc-resistant isolates selected in cell culture to clinical maraviroc resistance is not known. Maraviroc-resistant viruses were characterized phenotypically by concentration-response curves that did not reach 100% inhibition in phenotypic drug assays, rather than increases in EC₅₀ values.

Cross-Resistance in Cell Culture: Maraviroc had antiviral activity against HIV-1 clinical isolates resistant to NNRTIs, NRTIs, PIs, and the fusion inhibitor enfuvirtide in cell culture (EC₅₀ values ranged from 0.7 to 8.9 nM [0.36 to 4.57 ng per mL]). Maraviroc-resistant viruses that emerged in cell culture remained susceptible to enfuvirtide and the protease inhibitor saquinavir.

Clinical Resistance: Virologic failure on maraviroc can result from genotypic and phenotypic resistance to maraviroc, through outgrowth of undetected CXCR4-using virus present before maraviroc treatment (see Tropism below), through resistance to background therapy drugs (Table 15), or due to low exposure to maraviroc [see Clinical Pharmacology (12.2)].

Antiretroviral Treatment-Experienced Adult Subjects (Trials A4001027 and A4001028): Week 48 data from treatment-experienced subjects failing maraviroc-containing regimens with CCR5-tropic virus (n = 58) have identified 22 viruses that had decreased susceptibility to maraviroc characterized in phenotypic drug assays by concentration-response curves that did not reach 100% inhibition. Additionally, CCR5-tropic virus from 2 of these treatment-failure subjects had greater than or equal to 3-fold shifts in EC₅₀ values for maraviroc at the time of failure.

Fifteen of these viruses were sequenced in the gp120 encoding region and multiple amino acid substitutions with unique patterns in the heterogeneous V3 loop region were detected. Changes at either amino acid position 308 or 323 (HXB2 numbering) were seen in the V3 loop in 7 of the subjects with decreased maraviroc susceptibility. Substitutions outside the V3 loop of gp120 may also contribute to reduced susceptibility to maraviroc.

Antiretroviral Treatment-Naive Adult Subjects (Trial A4001026): Treatment-naive subjects receiving SELZENTRY had more virologic failures and more treatment-emergent resistance to the background regimen drugs compared with those receiving efavirenz (Table 15).

^aIncludes subjects failing with CXCR4- or dual/mixed-tropism because these viruses are not intrinsically susceptible to maraviroc.

In an as-treated analysis of treatment-naive subjects at 96 weeks, 32 subjects failed a maraviroc-containing regimen with CCR5-tropic virus and had a tropism result at failure; 7 of these subjects had evidence of maraviroc phenotypic resistance defined as concentration-response curves that did not reach 95% inhibition. One additional subject had a greater than or equal to 3-fold shift in the EC₅₀ value for maraviroc at the time of failure. A clonal analysis of the V3 loop amino acid envelope sequences was performed from 6 of the 7 subjects. Changes in V3 loop amino acid sequence differed between each of these different subjects, even for those infected with the same virus clade, suggesting that there are multiple diverse pathways to maraviroc resistance. The subjects who failed with CCR5-tropic virus and without a detectable maraviroc shift in susceptibility were not evaluated for genotypic resistance.

Of the 32 maraviroc virologic failures failing with CCR5-tropic virus, 20 (63%) also had genotypic and/or phenotypic resistance to background drugs in the regimen (lamivudine, zidovudine).

Tropism: In both treatment-experienced and treatment-naive subjects, detection of CXCR4-using virus prior to initiation of therapy has been associated with a reduced virologic response to maraviroc.

Antiretroviral Treatment-Experienced Subjects: In the majority of cases, treatment failure on maraviroc was associated with detection of CXCR4-using virus (i.e., CXCR4- or dual/mixed-tropic) which was not detected by the tropism assay prior to treatment. CXCR4-using virus was detected at failure in approximately 55% of subjects who failed treatment on maraviroc by Week 48, as compared with 9% of subjects who experienced treatment failure in the placebo arm. To investigate the likely origin of the on-treatment CXCR4-using virus, a detailed clonal analysis was conducted on virus from 20 representative subjects (16 subjects from the maraviroc arms and 4 subjects from the placebo arm) in whom CXCR4-using virus was detected at treatment failure. From analysis of amino acid sequence differences and phylogenetic data, it was determined that CXCR4-using virus in these subjects emerged from a low level of pre-existing CXCR4-using virus not detected by the tropism assay (which is population-based) prior to treatment rather than from a co-receptor switch from CCR5-tropic virus to CXCR4-using virus resulting from mutation in the virus.

Detection of CXCR4-using virus prior to initiation of therapy has been associated with a reduced virological response to maraviroc. Furthermore, subjects failing twice-daily maraviroc at Week 48 with CXCR4-using virus had a lower median increase in CD4+ cell counts from baseline (+41 cells per mm³) than those subjects failing with CCR5-tropic virus (+162 cells per mm³). The median increase in CD4+ cell count in subjects failing in the placebo arm was +7 cells per mm³.

Antiretroviral Treatment-Naive Subjects: In a 96-week trial of antiretroviral treatment-naive subjects, 14% (12 of 85) who had only CCR5-tropic virus at screening with an enhanced sensitivity tropism assay (TROFILE) and failed therapy on maraviroc had CXCR4-using virus at the time of treatment failure. A detailed clonal analysis was conducted in 2 previously antiretroviral treatment-naive subjects enrolled in a Phase 2a monotherapy trial who had CXCR4-using virus detected after 10 days’ treatment with maraviroc. Consistent with the detailed clonal analysis conducted in treatment-experienced subjects, the CXCR4-using variants appear to emerge from outgrowth of a pre-existing undetected CXCR4-using virus. Screening with an enhanced sensitivity tropism assay reduced the number of maraviroc virologic failures with CXCR4- or dual/mixed-tropic virus at failure to 12 compared with 24 when screening with the original tropism assay. All but one (11 of 12; 92%) of the maraviroc failures failing with CXCR4 or dual/mixed-tropic virus also had genotypic and phenotypic resistance to the background drug lamivudine at failure and 33% (4 of 12) developed zidovudine-associated resistance substitutions.

Subjects who had only CCR5-tropic virus at baseline and failed maraviroc therapy with CXCR4-using virus had a median increase in CD4+ cell counts from baseline of +113 cells per mm³ while those subjects failing with CCR5-tropic virus had an increase of +135 cells per mm³. The median increase in CD4+ cell count in subjects failing in the efavirenz arm was + 95 cells per mm³.

Antiretroviral Treatment-Experienced Pediatric Subjects (Trial A4001031): In the Week 48 analysis of Trial A4001031 (n = 103), the mechanisms of resistance to maraviroc observed in the treatment-experienced pediatric population were similar to those observed in adult populations: reasons for virologic failure included failing with CXCR4- or dual/mixed-tropic virus, evidence of reduced maraviroc susceptibility as measured by a decrease in maximal percentage inhibition (MPI), and emergence of resistance to background drug in the regimen.

Carcinogenesis

Long-term oral carcinogenicity studies of maraviroc were carried out in rasH2 transgenic mice (6 months) and in rats for up to 96 weeks (females) and 104 weeks (males). No drug-related increases in tumor incidence were found in mice at 1,500 mg per kg per day and in male and female rats at 900 mg per kg per day. The highest exposures in rats were approximately 11 times those observed in humans at the therapeutic dose of 300 mg twice daily for the treatment of HIV-1 infection.

Mutagenesis

Maraviroc was not genotoxic in the reverse mutation bacterial test (Ames test in Salmonella and E. coli), a chromosome aberration test in human lymphocytes, and rat bone marrow micronucleus test.

Impairment of Fertility

Maraviroc did not impair mating or fertility of male or female rats and did not affect sperm of treated male rats at approximately 20-fold higher exposures (AUC) than in humans given the recommended 300-mg twice-daily dose.

The clinical efficacy and safety of SELZENTRY are derived from analyses of data from 3 trials in adult subjects infected with CCR5-tropic HIV-1: Trials A4001027 and A4001028 in antiretroviral treatment-experienced adult subjects and Trial A4001026 in treatment-naive subjects. These trials were supported by a 48-week trial in antiretroviral treatment-experienced adult subjects infected with dual/mixed-tropic HIV-1, Trial A4001029.

Trials in CCR5-Tropic, Treatment-Experienced Subjects

Trials A4001027 and A4001028 were double-blind, randomized, placebo-controlled, multicenter trials in subjects infected with CCR5-tropic HIV-1. Subjects were required to have an HIV-1 RNA greater than 5,000 copies per mL despite at least 6 months of prior therapy with at least 1 agent from 3 of the 4 antiretroviral drug classes (greater than or equal to 1 NRTI, greater than or equal to 1 NNRTI, greater than or equal to 2 PIs, and/or enfuvirtide) or documented resistance to at least 1 member of each class. All subjects received an optimized background regimen consisting of 3 to 6 antiretroviral agents (excluding low-dose ritonavir) selected on the basis of the subject’s prior treatment history and baseline genotypic and phenotypic viral resistance measurements. In addition to the optimized background regimen, subjects were then randomized in a 2:2:1 ratio to SELZENTRY 300 mg once daily, SELZENTRY 300 mg twice daily, or placebo. Doses were adjusted based on background therapy as described in Dosage and Administration (2), Table 1.

In the pooled analysis for Trials A4001027 and A4001028, the demographics and baseline characteristics of the treatment groups were comparable (Table 16). Of the 1,043 subjects with a CCR5 tropism result at screening, 7.6% had a dual/mixed-tropism result at the baseline visit 4 to 6 weeks later. This illustrates the background change from CCR5- to dual/mixed-tropism result over time in this treatment-experienced population, prior to a change in antiretroviral regimen or administration of a CCR5 co-receptor antagonist.

^aOSS - Sum of active drugs in OBT based on combined information from genotypic and phenotypic testing.

^bResistance substitutions based on IAS guidelines.¹

The Week 48 results for the pooled Trials A4001027 and A4001028 are shown in Table 17.

^aOne additional subject died while receiving open-label therapy with SELZENTRY subsequent to discontinuing double-blind placebo due to insufficient response.

After 48 weeks of therapy, the proportions of subjects with HIV-1 RNA less than 400 copies per mL receiving SELZENTRY compared with placebo were 56% and 22%, respectively. The mean changes in plasma HIV-1 RNA from baseline to Week 48 were –1.84 log₁₀ copies per mL for subjects receiving SELZENTRY + OBT compared with –0.78 log₁₀ copies per mL for subjects receiving OBT only. The mean increase in CD4+ cell count was higher on SELZENTRY twice daily + OBT (124 cells per mm³) than on placebo + OBT (60 cells per mm³).

Trial in Dual/Mixed-Tropic, Treatment-Experienced Subjects

Trial A4001029 was an exploratory, randomized, double-blind, multicenter trial to determine the safety and efficacy of SELZENTRY in subjects infected with dual/mixed co-receptor tropic HIV-1. The inclusion/exclusion criteria were similar to those for Trials A4001027 and A4001028 above and the subjects were randomized in a 1:1:1 ratio to SELZENTRY once daily, SELZENTRY twice daily, or placebo. No increased risk of infection or HIV-1 disease progression was observed in the subjects who received SELZENTRY. Use of SELZENTRY was not associated with a significant decrease in HIV-1 RNA compared with placebo in these subjects and no adverse effect on CD4+ cell count was noted.

Trial in Treatment-Naive Subjects

Trial A4001026 was a randomized, double-blind, multicenter trial in subjects infected with CCR5-tropic HIV-1 classified by the original TROFILE tropism assay. Subjects were required to have plasma HIV-1 RNA greater than or equal to 2,000 copies per mL and could not have: 1) previously received any antiretroviral therapy for greater than 14 days, 2) an active or recent opportunistic infection or a suspected primary HIV-1 infection, or 3) phenotypic or genotypic resistance to zidovudine, lamivudine, or efavirenz. Subjects were randomized in a 1:1:1 ratio to SELZENTRY 300 mg once daily, SELZENTRY 300 mg twice daily, or efavirenz 600 mg once daily, each in combination with lamivudine/zidovudine. The efficacy and safety of SELZENTRY are based on the comparison of SELZENTRY twice daily versus efavirenz. In a pre-planned interim analysis at 16 weeks, SELZENTRY 300 mg once daily failed to meet the pre-specified criteria for demonstrating non-inferiority and was discontinued.

The demographic and baseline characteristics of the maraviroc and efavirenz treatment groups were comparable (Table 18). Subjects were stratified by screening HIV-1 RNA levels and by geographic region. The median CD4+ cell counts and mean HIV-1 RNA at baseline were similar for both treatment groups.

The treatment outcomes at 96 weeks for Trial A4001026 are shown in Table 19. Treatment outcomes are based on reanalysis of the screening samples using a more sensitive tropism assay, enhanced sensitivity TROFILE HIV tropism assay, which became available after the Week 48 analysis; approximately 15% of the subjects identified as CCR5-tropic in the original analysis had dual/mixed- or CXCR4-tropic virus. Screening with enhanced sensitivity version of the TROFILE tropism assay reduced the number of maraviroc virologic failures with CXCR4- or dual/mixed-tropic virus at failure to 12 compared with 24 when screening with the original TROFILE HIV tropism assay.

^aThe total number of subjects (311, 303) in Table 19 represents the subjects who had a CCR5-tropic virus in the reanalysis of screening samples using the more sensitive tropism assay. This reanalysis reclassified approximately 15% of subjects shown in Table 18 as having dual/mixed- or CXCR4-tropic virus. These numbers are different than those presented in Table 18 because the numbers in Table 18 reflect the subjects with CCR5-tropic virus according to the original tropism assay.

^bWeek 48 results: Virologic responders (less than 400): 228 of 311 (73%) in SELZENTRY, 219 of 303 (72%) in efavirenz;

Virologic responders (less than 50): 213 of 311 (69%) in SELZENTRY, 207 of 303 (68%) in efavirenz.

^cOther reasons for discontinuation include lost to follow-up, withdrawn, protocol violation, and other.

The median increase from baseline in CD4+ cell counts at Week 96 was 184 cells per mm³ for the arm receiving SELZENTRY compared with 155 cells per mm³ for the efavirenz arm.

Trial in CCR5-Tropic, Treatment-Experienced Subjects

Trial A4001031 is an open-label, multicenter trial in pediatric subjects aged 2 to less than 18 years infected with only CCR5‑tropic HIV‑1. Subjects were required to have HIV‑1 RNA greater than 1,000 copies per mL at screening. All subjects (n = 103) received SELZENTRY twice daily and OBT. Dosing of SELZENTRY was based on BSA and doses were adjusted based on whether the subject was receiving potent CYP3A inhibitors and/or inducers.

The population was 52% female and 69% black, with mean age of 10 years (range: 2 to 17 years). At baseline, mean plasma HIV-1 RNA was 4.4 log₁₀ copies per mL (range: 2.4 to 6.2 log₁₀ copies per mL), mean CD4+ cell count was 551 cells per mm³ (range: 1 to 1,654 cells per mm³), and mean CD4+ percent was 21% (range: 0% to 42%).

At 48 weeks, 48% of subjects treated with SELZENTRY and OBT achieved plasma HIV-1 RNA less than 48 copies per mL and 65% of subjects achieved plasma HIV-1 RNA less than 400 copies per mL. The mean CD4+ cell count (percent) increase from baseline to Week 48 was 247 cells per mm³ (5%).

• 1.IAS-USA Drug Resistance Mutations Figures. http://www.iasusa.org/pub/topics/2006/issue3/125.pdf

SELZENTRY film-coated tablets are available as follows:

25-mg, 75-mg, 150-mg, and 300-mg tablets are blue, biconvex, oval, film-coated tablets debossed with “MVC 25”, “MVC 75”, “MVC 150”, or “MVC 300”, respectively, on one side and plain on the other.

25-mg tablets: Bottle of 120 tablets (NDC 49702-233-08).

75-mg tablets: Bottle of 120 tablets (NDC 49702-235-08).

150-mg tablets: Bottle of 60 tablets (NDC 49702-223-18).

300-mg tablets: Bottle of 60 tablets (NDC 49702-224-18).

SELZENTRY film-coated tablets should be stored at 20^oC to 25^oC (68^oF to 77^oF); excursions permitted between 15^oC and 30^oC (59^oF and 86^oF) [see USP Controlled Room Temperature].

SELZENTRY oral solution is a clear, colorless, strawberry-flavored liquid. Each mL of the solution contains 20 mg of maraviroc. It is packaged in plastic bottles as follows:

Bottle of 230 mL (NDC 49702-237-55). Each bottle is packaged with one press-in bottle adapter and one 10–mL oral dosing syringe with 0.5–mL gradations. The press-in bottle adapter and oral dosing syringe are not made with natural rubber latex. This product does not require reconstitution.

SELZENTRY oral solution should be stored at 20^oC to 25^oC (68^oF to 77^oF); excursions permitted between 15^oC and 30^oC (59^oF and 86^oF) [see USP Controlled Room Temperature].

Advise the patient to read the FDA-approved patient labeling (Medication Guide and Instructions for Use).

Hepatotoxicity

Inform patients that hepatotoxicity, including life-threatening cases, has been reported with SELZENTRY; therefore, it is important to inform the healthcare professional if patients have underlying hepatitis B or C or elevations in liver-associated tests prior to treatment. Inform patients to stop SELZENTRY and seek medical evaluation immediately if they develop signs or symptoms of hepatitis or allergic reaction following use of SELZENTRY. Advise patients that laboratory tests for liver enzymes and bilirubin will be ordered prior to starting SELZENTRY, at other times during treatment, and if they develop severe rash or signs and symptoms of hepatitis or an allergic reaction on treatment [see Dosage and Administration (2.1), Warnings and Precautions (5.1, 5.2)].

Cardiovascular Events

When administering SELZENTRYin patients with cardiovascular comorbidities, a history of postural hypotension or receiving concomitant medication known to lower blood pressure, advise patients that they may be at increased risk for cardiovascular events. Advise patients to avoid driving or operating machinery if they experience dizziness while taking SELZENTRY [see Warnings and Precautions (5.3)].

Drug Interactions

Advise patients to inform their healthcare provider of concomitant HIV medications as dosage of SELZENTRY may be modified depending on other HIV medications taken with SELZENTRY. Advise patients that coadministration of SELZENTRY with St. John’s wort is not recommended as it can lead to loss of virologic response and possible resistance to SELZENTRY [see Dosage and Administration (2.2), Drug Interactions (7.1)].

Missed Dosage

Inform patients that it is important to take SELZENTRY in combination with other antiretroviral medications on a regular dosing schedule with or without food. Advise patients to avoid missing doses as it can result in development of resistance. Instruct patients that if they miss a dose, to take it as soon as they remember. Advise patients not to double their next dose or take more than the prescribed dose [see Dosage and Administration (2.2)].

Pregnancy

Inform patients that there is insufficient data on the safety of SELZENTRY in pregnancy. Inform patients that there is an antiretroviral pregnancy registry that monitors pregnancy outcomes in women exposed to SELZENTRY during pregnancy [see Use in Specific Populations (8.1)].

Lactation

Instruct women with HIV-1 infection not to breastfeed because HIV-1 can be passed to the baby in breast milk [see Use in Specific Populations (8.2)].

SELZENTRY and COMBIVIR are registered trademarks of the ViiV Healthcare group of companies.

TROFILE is a registered trademark of Monogram Biosciences, Inc.

Manufactured for:

ViiV Healthcare

Research Triangle Park, NC 27709

©2016 the ViiV Healthcare group of companies. All rights reserved.

SEL:12PI

PHARMACIST‑DETACH HERE AND GIVE MEDICATION GUIDE TO PATIENT

SELZENTRY is a registered trademark of the ViiV Healthcare group of companies.

©2016 the ViiV Healthcare group of companies. All rights reserved.

SEL:7MG

Open the bottle by pushing down firmly on the child-resistant cap and turning it counter-clockwise. See Figure A.

Do not throw away the child-resistant cap.

Remove the press-in bottle adapter and oral syringe from the plastic overwrap. With the bottle on a flat surface, push the ribbed end of the press-in bottle adapter all the way into the neck of the bottle while holding the bottle firmly. See Figure B.

Note: Do not remove the press-in bottle adapter from the bottle after it is inserted.

Check the dose in milliliters (mL) as prescribed by your healthcare provider. Find this marking on the oral syringe. See Figure C.

Insert the oral syringe into the upright bottle through the opening of the press-in bottle adapter until it is firmly in place. See Figure E.

With the oral syringe in place, turn the bottle upside down. Pull back the plunger of the oral syringe until the top of the plunger is even with the markings on the oral syringe for your prescribed dose. See Figure F.

If you see air bubbles in the oral syringe, fully push the plunger in to empty the oral solution back into the bottle. Then withdraw your prescribed dose of oral solution.

Turn the bottle upright and place the bottle on a flat surface. Remove the oral syringe from the bottle adapter and bottle by pulling straight up on the oral syringe. See Figure G.

Place the tip of the oral syringe into the inside of the child’s cheek.

Slowly push the plunger all the way down to give all the medicine in the oral syringe. Make sure the child has time to swallow the medicine.

Note: If the prescribed dose is more than 10 mL, you will need to divide the dose. Follow the instructions given to you by your healthcare provider or pharmacist about how to divide the dose and repeat Steps 5 through 9.

Close the bottle tightly by turning the child-resistant cap clockwise, leaving the press-in bottle adapter in place. See Figure J.

Rinse the oral syringe with tap water after each use.

Remove the plunger from the barrel by pulling the plunger and the barrel away from each other. See Figure K.

Rinse both with water. See Figure L.

Allow to air dry.

When the barrel and plunger are dry, put the oral syringe back together by inserting the plunger into the barrel. See Figure M. Store the oral syringe with the SELZENTRY oral solution.

Do not throw away the oral syringe.

INSTRUCTIONS FOR USE SELZENTRY® (sell-ZEN-tree) (maraviroc) oral solution
Read this Instructions for Use before you start taking SELZENTRY oral solution and each time you get a refill. There may be new information. This leaflet does not take the place of talking to your healthcare provider about your medical condition or treatment.
Important information about measuring SELZENTRY oral solution: Always use the oral syringe that comes with your SELZENTRY oral solution to measure your prescribed dose. Ask your healthcare provider or pharmacist to show you how to measure your prescribed dose if you are not sure.
Each carton of SELZENTRY oral solution contains: 1 oral dosing syringe 1 press-in bottle adapter 1 bottle of SELZENTRY oral solution	Carton Contents (Selzentry Spl Graphic 02)
Before each use: Wash your hands with soap and water and place the items from the carton on a clean flat surface.
Figure A. Opening the bottle Figure A (Selzentry Spl Graphic 03)
Figure B. Inserting the press-in bottle adapter Figure B (Selzentry Spl Graphic 04)
Figure C. Find your prescribed dose Figure C (Selzentry Spl Graphic 05)
Step 4. Remove air from oral syringe. Push the oral syringe plunger to the bottom of the barrel of the syringe (toward its tip) to remove excess air. See Figure D.	Figure D. Removing air from oral syringe. Figure D (Selzentry Spl Graphic 06)
Figure E. Inserting the oral syringe Figure E (Selzentry Spl Graphic 07)
Figure F. Withdrawing the oral solution Figure F (Selzentry Spl Graphic 08)
Figure G. Removing the oral syringe Figure G (Selzentry Spl Graphic 09)
Step 8. Check the dose withdrawn. Check that the correct dose was drawn up into the oral syringe. See Figure H. If the dose is not correct, insert the oral syringe tip firmly into the bottle adapter. Fully push in the plunger so that the oral solution flows back into the bottle. Repeat Steps 6 and 7.	Figure H. Checking the dose withdrawn Figure H (Selzentry Spl Graphic 10)
Figure I. Taking the dose of SELZENTRY Figure I (Selzentry Spl Graphic 11)
Figure J. Closing the bottle Figure J (Selzentry Spl Graphic 12)
Figure K. Removing the plunger from the barrel Figure K (Selzentry Spl Graphic 13) Figure L. Rinsing the plunger and barrel Figure L (Selzentry Spl Graphic 14)
Figure M. Putting the oral syringe back together Figure M (Selzentry Spl Graphic 15)
How should I store SELZENTRY? Store SELZENTRY oral solution at room temperature between 68°F to 77°F (20°C to 25°C). Keep SELZENTRY and all medicines out of the reach of children.
Manufactured for: ViiV Healthcare Research Triangle Park, NC 27709 SELZENTRY is a registered trademark of the ViiV Healthcare group of companies. ©2016 the ViiV Healthcare group of companies. All rights reserved. SEL:1IFU
This Instructions for Use has been approved by the U.S. Food and Drug Administration.	Issued: 11/2016

PRINICIPAL DISPLAY PANEL

NDC 49702-233-08

Selzentry^®

(maraviroc) tablets

25 mg

ALWAYS DISPENSE WITH MEDICATION GUIDE

120 Tablets

Rx only

Manufactured for:

ViiV Healthcare

Research Triangle Park, NC 27709

Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (59°F - 86°F) [see USP Controlled Room Temperature].

Do not use if printed safety seal under cap is broken or missing.

Dispense in tight containers (USP).

DOSAGE AND USE

See prescribing information for dosage information.

Each tablet contains 25 mg of maraviroc.

Made in Belgium

Rev. 10/16

PAA071383

Selzentry 25 mg 120 Count Label (Selzentry Spl Graphic 16)

PRINICIPAL DISPLAY PANEL

NDC 49702-235-08

Selzentry^®

(maraviroc) tablets

75 mg

ALWAYS DISPENSE WITH MEDICATION GUIDE

120 Tablets

Rx only

Manufactured for:

ViiV Healthcare

Research Triangle Park, NC 27709

Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (59°F - 86°F) [see USP Controlled Room Temperature].

Do not use if printed safety seal under cap is broken or missing.

Dispense in tight containers (USP).

DOSAGE AND USE

See prescribing information for dosage information.

Each tablet contains 75 mg of maraviroc.

Made in Belgium

Rev. 10/16

PAA071382

Selzentry 75 mg 120 Count Label (Selzentry Spl Graphic 17)

PRINICIPAL DISPLAY PANEL

NDC 49702-223-18

Selzentry^®

(maraviroc) tablets

150 mg

ALWAYS DISPENSE WITH MEDICATION GUIDE

60 Tablets

Rx only

Manufactured for:

ViiV Healthcare

Research Triangle Park, NC 27709

Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (59°F - 86°F) [see USP Controlled Room Temperature].

Do not use if printed safety seal under cap is broken or missing.

Dispense in tight containers (USP).

DOSAGE AND USE

See prescribing information for dosage information.

Each tablet contains 150 mg of maraviroc.

Made in Belgium

Rev. 12/16

PAA083035

Selzentry 150 mg 60 Count Label (Selzentry Spl Graphic 18)

PRINICIPAL DISPLAY PANEL

NDC 49702-224-18

Selzentry^®

(maraviroc) tablets

300 mg

ALWAYS DISPENSE WITH MEDICATION GUIDE

60 Tablets

Rx only

Manufactured for:

ViiV Healthcare

Research Triangle Park, NC 27709

Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (59°F - 86°F) [see USP Controlled Room Temperature].

Do not use if printed safety seal under cap is broken or missing.

Dispense in tight containers (USP).

DOSAGE AND USE

See prescribing information for dosage information.

Each tablet contains 300 mg of maraviroc.

Made in Belgium

Rev. 12/16

PAA083036

Selzentry 300 mg 60 Count Label (Selzentry Spl Graphic 19)

PRINICIPAL DISPLAY PANEL

NDC 49702-237-55

Selzentry

(maraviroc) oral solution

20 mg/mL

ALWAYS DISPENSE WITH MEDICATION GUIDE

Contents:

• Oral solution bottle
• 1 Oral dosing syringe
• 1 Press-in bottle adapter
• Prescribing Information
• Medication Guide
• Instructions for Use

Rx only

230 mL

©2017 the ViiV Healthcare group of companies or its licensor.

Rev. 8/17

PAA091184



Selzentry Oral Solution 20 mg Per mL 230 mL Carton (Selzentry Spl Graphic 20)