NDC 50090-4102 Xofluza

Baloxavir Marboxil

NDC Product Code 50090-4102

NDC CODE: 50090-4102

Proprietary Name: Xofluza What is the Proprietary Name?
The proprietary name also known as the trade name is the name of the product chosen by the medication labeler for marketing purposes.

Non-Proprietary Name: Baloxavir Marboxil What is the Non-Proprietary Name?
The non-proprietary name is sometimes called the generic name. The generic name usually includes the active ingredient(s) of the product.

Drug Use Information

Drug Use Information
The drug use information is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate. This information is not individual medical advice and does not substitute for the advice of a health care professional. Always ask a health care professional for complete information about this product and your specific health needs.

  • Baloxavir marboxil is an antiviral medication used to treat the flu (influenza) if your symptoms started less than 48 hours ago. It helps make the symptoms (such as stuffy nose, cough, sore throat, fever/chills, aches, tiredness) less severe and may shorten the recovery time by 1 to 2 days. Baloxavir marboxil works by stopping the flu virus from growing. It will not treat other kinds of infection besides the flu virus. Baloxavir marboxil is not a substitute for the flu vaccine. (See also Notes section.)

Product Characteristics

Color(s):
YELLOW (C48330 - WHITE TO LIGHT YELLOW)
Shape: OVAL (C48345)
Size(s):
9 MM
Imprint(s):
772;20
Score: 1

NDC Code Structure

  • 50090 - A-s Medication Solutions

NDC 50090-4102-0

Package Description: 1 BLISTER PACK in 1 CARTON > 2 TABLET, FILM COATED in 1 BLISTER PACK

NDC Product Information

Xofluza with NDC 50090-4102 is a a human prescription drug product labeled by A-s Medication Solutions. The generic name of Xofluza is baloxavir marboxil. The product's dosage form is tablet, film coated and is administered via oral form.

Labeler Name: A-s Medication Solutions

Dosage Form: Tablet, Film Coated - A solid dosage form that contains medicinal substances with or without suitable diluents and is coated with a thin layer of a water-insoluble or water-soluble polymer.

Product Type: Human Prescription Drug What kind of product is this?
Indicates the type of product, such as Human Prescription Drug or Human Over the Counter Drug. This data element matches the “Document Type” field of the Structured Product Listing.

Xofluza Active Ingredient(s)

What is the Active Ingredient(s) List?
This is the active ingredient list. Each ingredient name is the preferred term of the UNII code submitted.

  • BALOXAVIR MARBOXIL 20 mg/1

Inactive Ingredient(s)

About the Inactive Ingredient(s)
The inactive ingredients are all the component of a medicinal product OTHER than the active ingredient(s). The acronym "UNII" stands for “Unique Ingredient Identifier” and is used to identify each inactive ingredient present in a product.

  • LACTOSE MONOHYDRATE (UNII: EWQ57Q8I5X)
  • CROSCARMELLOSE SODIUM (UNII: M28OL1HH48)
  • POVIDONE K25 (UNII: K0KQV10C35)
  • MICROCRYSTALLINE CELLULOSE (UNII: OP1R32D61U)
  • SODIUM STEARYL FUMARATE (UNII: 7CV7WJK4UI)
  • HYPROMELLOSE, UNSPECIFIED (UNII: 3NXW29V3WO)
  • TALC (UNII: 7SEV7J4R1U)
  • TITANIUM DIOXIDE (UNII: 15FIX9V2JP)

Administration Route(s)

What are the Administration Route(s)?
The translation of the route code submitted by the firm, indicating route of administration.

  • Oral - Administration to or by way of the mouth.

Pharmacological Class(es)

What is a Pharmacological Class?
These are the reported pharmacological class categories corresponding to the SubstanceNames listed above.

  • Polymerase Acidic Endonuclease Inhibitor - [EPC] (Established Pharmacologic Class)
  • Polymerase Acidic Endonuclease Inhibitors - [MoA] (Mechanism of Action)
  • Chelating Activity - [MoA] (Mechanism of Action)

Product Labeler Information

What is the Labeler Name?
Name of Company corresponding to the labeler code segment of the Product NDC.

Labeler Name: A-s Medication Solutions
Labeler Code: 50090
FDA Application Number: NDA210854 What is the FDA Application Number?
This corresponds to the NDA, ANDA, or BLA number reported by the labeler for products which have the corresponding Marketing Category designated. If the designated Marketing Category is OTC Monograph Final or OTC Monograph Not Final, then the Application number will be the CFR citation corresponding to the appropriate Monograph (e.g. “part 341”). For unapproved drugs, this field will be null.

Marketing Category: NDA - A product marketed under an approved New Drug Application. What is the Marketing Category?
Product types are broken down into several potential Marketing Categories, such as NDA/ANDA/BLA, OTC Monograph, or Unapproved Drug. One and only one Marketing Category may be chosen for a product, not all marketing categories are available to all product types. Currently, only final marketed product categories are included. The complete list of codes and translations can be found at www.fda.gov/edrls under Structured Product Labeling Resources.

Start Marketing Date: 10-24-2018 What is the Start Marketing Date?
This is the date that the labeler indicates was the start of its marketing of the drug product.

Listing Expiration Date: 12-31-2022 What is the Listing Expiration Date?
This is the date when the listing record will expire if not updated or certified by the product labeler.

Exclude Flag: N - NO What is the NDC Exclude Flag?
This field indicates whether the product has been removed/excluded from the NDC Directory for failure to respond to FDA"s requests for correction to deficient or non-compliant submissions ("Y"), or because the listing certification is expired ("E"), or because the listing data was inactivated by FDA ("I"). Values = "Y", "N", "E", or "I".

* Please review the disclaimer below.

Xofluza Product Labeling Information

The product labeling information includes all published material associated to a drug. Product labeling documents include information like generic names, active ingredients, ingredient strength dosage, routes of administration, appearance, usage, warnings, inactive ingredients, etc.

Product Labeling Index

1 Indications And Usage

XOFLUZA™ is indicated for the treatment of acute uncomplicated influenza in patients 12 years of age and older who have been symptomatic for no more than 48 hours.

Other

Limitations of Use:Influenza viruses change over time, and factors such as the virus type or subtype, emergence of resistance, or changes in viral virulence could diminish the clinical benefit of antiviral drugs. Consider available information on drug susceptibility patterns for circulating influenza virus strains when deciding whether to use XOFLUZA [see Microbiology (12.4) and Clinical Studies (14)].

Adults and Adolescents (12 years of age and older)The recommended dose of XOFLUZA in patients 12 years of age or older with acute uncomplicated influenza is a single weight-based dose as follows:Table 1 Recommended XOFLUZA Dosage in Adults and Adolescents 12 Years and OlderPatient Body Weight (kg)Recommended Oral Dose40 kg to less than 80 kgSingle Dose of 40 mgAt least 80 kgSingle Dose of 80 mg

Risk SummaryThere are no available data on XOFLUZA use in pregnant women to inform a drug-associated risk of adverse developmental outcomes. There are risks to the mother and fetus associated with influenza virus infection in pregnancy (see Clinical Considerations). In animal reproduction studies, no adverse developmental effects were observed in rats or rabbits with oral administration of baloxavir marboxil at exposures approximately 5 (rats) and 7 (rabbits) times the systemic baloxavir exposure at the maximum recommended human dose (MRHD) (see Data).The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defects, 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 2-4% and 15-20%, respectively.

Clinical Considerations

Disease-associated maternal and/or embryo/fetal risk Pregnant women are at higher risk of severe complications from influenza, which may lead to adverse pregnancy and/or fetal outcomes including maternal death, stillbirth, birth defects, preterm delivery, low birth weight and small for gestational age.

Data

Animal DataBaloxavir marboxil was administered orally to pregnant rats (20, 200, or 1,000 mg/kg/day from gestation day 6 to 17) and rabbits (30, 100, or 1,000 mg/kg/day from gestation day 7 to 19). No adverse embryo-fetal effects were observed in rats up to the highest dose of baloxavir marboxil (1,000 mg/kg/day), resulting in systemic baloxavir exposure (AUC) of approximately 5 times the exposure at the MRHD. In rabbits, fetal skeletal variations occurred at a maternally toxic dose (1,000 mg/kg/day) resulting in 2 abortions out of 19 pregnancies. No adverse maternal or embryo-fetal effects were observed in rabbits at the middle dose (100 mg/kg/day) resulting in systemic baloxavir exposure (AUC) approximately 7 times the exposure at the MRHD.In the prenatal and postnatal development study in rats, baloxavir marboxil was administered orally at 20, 200, or 1,000 mg/kg/day from gestation day 6 to postpartum/lactation day 20. No significant effects were observed in the offspring at maternal systemic baloxavir exposure (AUC) approximately 5 times the exposure at the MRHD.

Risk Summary There are no data on the presence of baloxavir marboxil in human milk, the effects on the breastfed infant, or the effects on milk production. Baloxavir and its related metabolites were present in the milk of lactating rats (see Data). The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for XOFLUZA and any potential adverse effects on the breastfed child from the drug or from the underlying maternal condition.

DataIn a lactation study, baloxavir and its related metabolites were excreted in the milk of lactating rats administered baloxavir marboxil (1 mg/kg) on postpartum/lactation day 11, with peak milk concentration approximately 5 times that of maternal plasma concentrations occurring 2 hours post-dose. No effects of baloxavir marboxil on growth and postnatal development were observed in nursing pups at the highest oral dose tested in rats. Maternal systemic exposure was approximately 5 times the baloxavir exposure in humans at the MRHD.

Cardiac ElectrophysiologyAt twice the expected exposure from recommended dosing, XOFLUZA did not prolong the QTc interval.

Exposure-Response RelationshipsNo change in the baloxavir exposure-response (time to alleviation of symptoms) relationship was observed at the recommended dosing.

Specific PopulationsThere were no clinically significant differences in the pharmacokinetics of baloxavir based on age (adolescents as compared to adults), or sex.

Patients with Renal ImpairmentA population pharmacokinetic analysis did not identify a clinically meaningful effect of renal function on the pharmacokinetics of baloxavir in patients with creatinine clearance (CrCl) 50 mL/min and above. The effects of severe renal impairment on the pharmacokinetics of baloxavir marboxil or its active metabolite, baloxavir, have not been evaluated.

Patients with Hepatic Impairment In a clinical study comparing pharmacokinetics of baloxavir in subjects with moderate hepatic impairment (Child-Pugh class B) to subjects with normal hepatic function, no clinically meaningful differences in the pharmacokinetics of baloxavir were observed.The pharmacokinetics in patients with severe hepatic impairment have not been evaluated.

Body WeightBody weight had a significant effect on the pharmacokinetics of baloxavir (as body weight increases, baloxavir exposure decreases). When dosed with the recommended weight-based dosing, no clinically significant difference in exposure was observed between body weight groups.

Race/EthnicityBased on a population pharmacokinetic analysis, baloxavir exposure is approximately 35% lower in non-Asians as compared to Asians; this difference is not considered clinically significant when the recommended dose was administered.

Drug Interaction Studies

Clinical StudiesNo clinically significant changes in the pharmacokinetics of baloxavir marboxil and its active metabolite, baloxavir, were observed when co-administered with itraconazole (combined strong CYP3A and P-gp inhibitor), probenecid (UGT inhibitor), or oseltamivir. No clinically significant changes in the pharmacokinetics of the following drugs were observed when co-administered with baloxavir marboxil: midazolam (CYP3A4 substrate), digoxin (P-gp substrate), rosuvastatin (BCRP substrate), or oseltamivir.

In Vitro Studies Where Drug Interaction Potential Was Not Further Evaluated Clinically

Cytochrome P450 (CYP) Enzymes: Baloxavir marboxil and its active metabolite, baloxavir, did not inhibit CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, or CYP2D6. Baloxavir marboxil and its active metabolite, baloxavir, did not induce CYP1A2, CYP2B6, or CYP3A4.

Uridine diphosphate (UDP)-glucuronosyl transferase (UGT) Enzymes: Baloxavir marboxil and its active metabolite, baloxavir, did not inhibit UGT1A1, UGT1A3, UGT1A4, UGT1A6, UGT1A9, UGT2B7, or UGT2B15.

Transporter Systems: Both baloxavir marboxil and baloxavir are substrates of P-glycoprotein (P-gp). Baloxavir did not inhibit organic anion transporting polypeptides (OATP) 1B1, OATP1B3, organic cation transporter (OCT) 1, OCT2, organic anion transporter (OAT) 1, OAT3, multidrug and toxin extrusion (MATE) 1, or MATE2K.

Potential for Interactions with Polyvalent Cations: Baloxavir may form a chelate with polyvalent cations such as calcium, aluminum, or magnesium in food or medications. A significant decrease in baloxavir exposure was observed when XOFLUZA was co-administered with calcium, aluminum, magnesium, or iron in monkeys. No study has been conducted in humans.

Mechanism of ActionBaloxavir marboxil is a prodrug that is converted by hydrolysis to baloxavir, the active form that exerts anti-influenza virus activity. Baloxavir inhibits the endonuclease activity of the polymerase acidic (PA) protein, an influenza virus-specific enzyme in the viral RNA polymerase complex required for viral gene transcription, resulting in inhibition of influenza virus replication. The 50% inhibitory concentration (IC50) of baloxavir was 1.4 to 3.1 nM (n=4) for influenza A viruses and 4.5 to 8.9 nM (n=3) for influenza B viruses in a PA endonuclease assay. Viruses with reduced susceptibility to baloxavir have amino acid substitutions in the PA protein.

Antiviral ActivityThe antiviral activity of baloxavir against laboratory strains and clinical isolates of influenza A and B viruses was determined in an MDCK-cell-based plaque reduction assay. The median 50% effective concentration (EC50) values of baloxavir were 0.73 nM (n=19; range: 0.20-1.85 nM) for subtype A/H1N1 strains, 0.68 nM (n=19; range: 0.35-1.87 nM) for subtype A/H3N2 strains, and 5.28 nM (n=21; range: 3.33-13.00 nM) for type B strains. In an MDCK-cell-based virus titer reduction assay, the 90% effective concentration (EC90) values of baloxavir against avian subtypes A/H5N1 and A/H7N9 were 1.64 and 0.80 nM, respectively. The relationship between antiviral activity in cell culture and clinical response to treatment in humans has not been established.

Resistance

Cell culture: Influenza A virus isolates with reduced susceptibility to baloxavir were selected by serial passage of virus in cell culture in the presence of increasing concentrations of baloxavir. Reduced susceptibility of influenza A virus to baloxavir was conferred by amino acid substitutions I38T (A/H1N1 and A/H3N2) and E199G (A/H3N2) in the PA protein of the viral RNA polymerase complex.

Clinical studies: Influenza A and B viruses with treatment-emergent amino acid substitutions at positions associated with reduced susceptibility to baloxavir in cell culture were observed in clinical studies (Table 4). The overall incidence of treatment-emergent amino acid substitutions associated with reduced susceptibility to baloxavir in Trials 1 and 2 was 2.7% (5/182) and 11% (39/370), respectively. Table 4 Treatment-Emergent Amino Acid Substitutions in PA Associated with Reduced Susceptibility to BaloxavirInfluenza Type/SubtypeA/H1N1A/H3N2BAmino Acid SubstitutionE23K/R, I38F/TE23G/K, A37T, I38M/T, E199GI38TNone of the treatment-emergent substitutions associated with reduced susceptibility to baloxavir were identified in virus from pre-treatment respiratory specimens in the clinical studies. Strains containing substitutions known to be associated with reduced susceptibility to baloxavir were identified in approximately 0.05% of PA sequences in the National Center for Biotechnology Information/GenBank database (queried August 2018). Prescribers should consider currently available surveillance information on influenza virus drug susceptibility patterns and treatment effects when deciding whether to use XOFLUZA.

Cross-ResistanceCross-resistance between baloxavir and neuraminidase (NA) inhibitors, or between baloxavir and M2 proton pump inhibitors (adamantanes), is not expected, because these drugs target different viral proteins. Baloxavir is active against NA inhibitor-resistant strains, including A/H1N1 and A/H5N1 viruses with the NA substitution H275Y (A/H1N1 numbering), A/H3N2 virus with the NA substitution E119V, A/H7N9 virus with the NA substitution R292K (A/H3N2 numbering), and type B virus with the NA substitution D198E (A/H3N2 numbering). The NA inhibitor oseltamivir is active against viruses with reduced susceptibility to baloxavir, including A/H1N1 virus with PA substitutions E23K or I38F/T, A/H3N2 virus with PA substitutions E23G/K, A37T, I38M/T, or E199G, and type B virus with the PA substitution I38T. Influenza virus may carry amino acid substitutions in PA that reduce susceptibility to baloxavir and at the same time carry resistance-associated substitutions for NA inhibitors and M2 proton pump inhibitors. The clinical relevance of phenotypic cross-resistance evaluations has not been established.

Immune ResponseInteraction studies with influenza vaccines and baloxavir marboxil have not been conducted.

CarcinogenesisCarcinogenicity studies have not been performed with baloxavir marboxil.

MutagenesisBaloxavir marboxil and the active metabolite, baloxavir, were not mutagenic in in vitro and in in vivo genotoxicity assays which included bacterial mutation assays in S. typhimurium and E. coli, micronucleus tests with cultured mammalian cells, and in the rodent micronucleus assay.

Impairment of FertilityIn a fertility and early embryonic development study in rats, doses of baloxavir marboxil at 20, 200, or 1,000 mg/kg/day were administered to females for 2 weeks before mating, during mating and until day 7 of pregnancy. Males were dosed for 4 weeks before mating and throughout mating. There were no effects on fertility, mating performance, or early embryonic development at any dose level, resulting in systemic drug exposure (AUC) approximately 5 times the MRHD.

Important Dosing InformationInstruct patients to begin treatment with XOFLUZA as soon as possible at the first appearance of influenza symptoms, within 48 hours of onset of symptoms. XOFLUZA can be taken with or without food, but advise patients not to take with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc) [see Dosage and Administration (2) and Drug Interactions (7.1)].

Influenza VaccinesBecause of the potential for antivirals to decrease the effectiveness of live attenuated influenza vaccine, advise patients to consult their healthcare provider prior to receiving a live attenuated influenza vaccine after taking XOFLUZA [see Drug Interactions (7.2)].

Distributed by:Genentech USA, Inc. A Member of the Roche Group 1 DNA Way South San Francisco, CA 94080-4990 Manufactured by:Shionogi & Co., Ltd. 2-5-1 Mishima, Settsu Osaka 566-0022, JapanXOFLUZA™ is a trademark of Genentech, Inc.© 2018 Genentech USA, Inc.

2 Dosage And Administration

Initiate treatment with XOFLUZA within 48 hours of influenza symptom onset. XOFLUZA is taken orally as a single dose and may be taken with or without food. However, co-administration of XOFLUZA with dairy products, calcium-fortified beverages, polyvalent cation-containing laxatives, antacids or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc) should be avoided [see Drug Interactions (7.1), Clinical Pharmacology (12.3)].

3 Dosage Forms And Strengths

XOFLUZA 20 mg Tablets are white to light yellow, oblong shaped film-coated tablets debossed with "772" on one side and "20" on the other side.XOFLUZA 40 mg Tablets are white to light yellow, oblong shaped film-coated tablets debossed with "BXM40" on one side.

4 Contraindications

XOFLUZA is contraindicated in patients with a history of hypersensitivity to baloxavir marboxil or any of its ingredients.

5.1 Risk Of Bacterial Infections

There is no evidence of efficacy of XOFLUZA in any illness caused by pathogens other than influenza viruses. Serious bacterial infections may begin with influenza-like symptoms, may coexist with, or occur as a complication of influenza. XOFLUZA has not been shown to prevent such complications. Prescribers should be alert to potential secondary bacterial infections and treat them as appropriate.

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.The safety profile of XOFLUZA is based on data from 2 placebo-controlled trials, in which a total of 910 subjects received XOFLUZA: 834 (92%) were adults (18 years and older) and 76 (8%) were adolescents (12 to less than 18 years). Of these, 710 subjects received XOFLUZA at the recommended dose. In Trial 1, adult subjects 20 to 64 years of age received a single oral dose of XOFLUZA or placebo. In Trial 2, adult subjects 20 to 64 years of age received XOFLUZA, placebo as a single oral dose on Day 1, or oseltamivir twice a day for 5 days, and adolescent subjects 12 to less than 20 years of age received XOFLUZA or placebo as a single oral dose.Table 2 displays the most common adverse events (regardless of causality assessment) reported in at least 1% of adult and adolescent subjects who received XOFLUZA at the recommended dose in Trials 1 and 2. Table 2 Incidence of Adverse Events Occurring in Greater Than or Equal to 1% of Subjects Receiving XOFLUZA in the Acute Uncomplicated Influenza TrialsAdverse EventXOFLUZA (N = 710)Placebo (N = 409)Diarrhea3%5%Bronchitis2%4%Nausea1%1%Nasopharyngitis1%1%Headache1%2%

7.1 Effect Of Other Drugs On Xofluza

Co-administration with polyvalent cation-containing products may decrease plasma concentrations of baloxavir which may reduce XOFLUZA efficacy. Avoid co-administration of XOFLUZA with polyvalent cation-containing laxatives, antacids, or oral supplements (e.g., calcium, iron, magnesium, selenium, or zinc).

7.2 Vaccines

The concurrent use of XOFLUZA with intranasal live attenuated influenza vaccine (LAIV) has not been evaluated. Concurrent administration of antiviral drugs may inhibit viral replication of LAIV and thereby decrease the effectiveness of LAIV vaccination. Interactions between inactivated influenza vaccines and XOFLUZA have not been evaluated.

8.4 Pediatric Use

The safety and effectiveness of XOFLUZA for the treatment of influenza have been established in pediatric patients 12 years of age and older weighing at least 40 kg [see Adverse Reactions (6.1) and Clinical Studies (14)]. The safety and effectiveness of XOFLUZA have not been established in pediatric patients less than 12 years of age.The use of XOFLUZA in pediatric patients 12 years of age and older weighing at least 40 kg is supported by one randomized, double-blind, controlled trial [see Clinical Studies (14)]. In this phase 3 trial, 118 adolescents were randomized to receive either XOFLUZA (N=80) or placebo (N=38). The median time to alleviation of symptoms in adolescent subjects was 54 hours compared to 93 hours for subjects who received placebo. Adverse reactions reported in adolescents were similar to those reported in adults [see Adverse Reactions (6.1)].

8.5 Geriatric Use

Clinical trials of XOFLUZA did not include subjects 65 years of age and older to determine whether they respond differently from younger subjects.

10 Overdosage

There have been no reports of XOFLUZA overdoses. Treatment of an overdose of XOFLUZA should consist of general supportive measures including monitoring of vital signs and observation of the clinical status of the patient. There is no specific antidote for overdose with XOFLUZA. Baloxavir is unlikely to be significantly removed by dialysis due to high serum protein binding [see Clinical Pharmacology (12.3)].

11 Description

XOFLUZA (baloxavir marboxil) is an antiviral PA endonuclease inhibitor. XOFLUZA is supplied as white to light yellow film-coated tablets for oral administration.The active component of XOFLUZA is baloxavir marboxil. Baloxavir marboxil has a molecular weight of 571.55 and a partition coefficient (log P) of 2.26. It is freely soluble in dimethylsulfoxide, soluble in acetonitrile, slightly soluble in methanol and ethanol and practically insoluble in water. The chemical name of baloxavir marboxil is ({(12aR)-12-[(11S)-7,8-Difluoro-6,11-dihydrodibenzo[b,e]thiepin-11-yl]-6,8-dioxo-3,4,6,8,12,12a-hexahydro-1H-[1,4]oxazino[3,4-c]pyrido[2,1-f][1,2,4]triazin-7-yl}oxy)methyl methyl carbonate. The empirical formula of baloxavir marboxil is C27H23F2N3O7S and the chemical structure is shown below.The inactive ingredients of XOFLUZA are: croscarmellose sodium, hypromellose, lactose monohydrate, microcrystalline cellulose, povidone, sodium stearyl fumarate, talc, and titanium dioxide.

12.1 Mechanism Of Action

Baloxavir marboxil is an antiviral drug with activity against influenza virus [see Microbiology (12.4)].

12.3 Pharmacokinetics

Baloxavir marboxil is a prodrug that is almost completely converted to its active metabolite, baloxavir, following oral administration.In the phase 3 trial, at the recommended dose of 40 mg for subjects weighing less than 80 kg, the mean (CV%) values of baloxavir Cmax and AUC0-inf were 96.4 ng/mL (45.9%) and 6160 ng∙hr/mL (39.2%), respectively. At the recommended dose of 80 mg for subjects weighing 80 kg and more, the mean (CV%) values of baloxavir Cmax and AUC0-inf were 107 ng/mL (47.2%) and 8009 ng∙hr/mL (42.4%), respectively. Refer to Table 3 for pharmacokinetic parameters of baloxavir in healthy subjects.Table 3 Pharmacokinetic Parameters of Plasma BaloxavirAbsorption  Tmax (hr)Median4  Effect of food (relative to fasting)Meal: approximately 400 to 500 kcal including 150 kcal from fatCmax: ↓48%, AUC0-inf; ↓36%Distribution  % Bound to human serum proteinsin vitro92.9 - 93.9  Ratio of blood cell to blood48.5% - 54.4%  Volume of distribution (V/F, L)Geometric mean (geometric CV%)1180 (20.8%)Elimination  Major route of eliminationMetabolism  Clearance (CL/F, L/hr)10.3 (22.5%)  t1/2 (hr), Apparent terminal elimination half-life79.1 (22.4%)  Metabolism  Metabolic pathwaysBaloxavir is primarily metabolized by UGT1A3 with minor contribution from CYP3A4UGT1A3, CYP3A4  Excretion  % of dose excreted in urineRatio of radioactivity to radio-labeled [14C]-baloxavir marboxil dose in mass balance study14.7 (Total radioactivity), 3.3 (Baloxavir)  % of dose excreted in feces80.1 (Total radioactivity)

14 Clinical Studies

Two randomized controlled double-blinded clinical trials conducted in two different influenza seasons evaluated efficacy and safety of XOFLUZA in otherwise healthy subjects with acute uncomplicated influenza.In Trial 1, a placebo-controlled phase 2 dose-finding trial, a single oral dose of XOFLUZA was compared with placebo in 400 adult subjects 20 to 64 years of age in Japan. All subjects in Trial 1 were Asian, the majority of subjects were male (62%), and the mean age was 38 years. In this trial, among subjects who received XOFLUZA and had influenza virus typed, influenza A/H1N1 was the predominant strain (63%), followed by influenza B (25%), and influenza A/H3N2 (12%).In Trial 2 (NCT02954354), a phase 3 active- and placebo-controlled trial, XOFLUZA was studied in 1,436 adult and adolescent subjects 12 to 64 years of age weighing at least 40 kg in the U.S. and Japan. Adults ages 20 to 64 years received XOFLUZA or placebo as a single oral dose on Day 1 or oseltamivir twice a day for 5 days. Subjects in the XOFLUZA and placebo arms received a placebo for the duration of oseltamivir dosing after XOFLUZA or placebo dosing in that arm. Adolescent subjects 12 to less than 20 years of age received XOFLUZA or placebo as a single oral dose. In Trial 2, subjects weighing less than 80 kg received XOFLUZA at a dose of 40 mg and subjects weighing 80 kg or more received an 80 mg dose. Seventy-eight percent of subjects in Trial 2 were Asian, 17% were White, and 4% were Black or African American. The mean age was 34 years, and 11% of subjects were less than 20 years of age; 54% of subjects were male and 46% female. In Trial 2, among subjects who received XOFLUZA and had influenza virus typed, influenza A/H3N2 was the predominant strain (90%), followed by influenza B (9%), and influenza A/H1N1 (2%). In both trials, eligible subjects had an axillary temperature of at least 38˚C, at least one moderate or severe respiratory symptom (cough, nasal congestion, or sore throat), and at least one moderate or severe systemic symptom (headache, feverishness or chills, muscle or joint pain, or fatigue) and all were treated within 48 hours of symptom onset. Subjects participating in the trial were required to self-assess their influenza symptoms as "none", "mild", "moderate" or "severe" twice daily. The primary efficacy population was defined as those with a positive rapid influenza diagnostic test (Trial 1) or positive influenza RT-PCR (Trial 2) at trial entry. The primary endpoint of both trials, time to alleviation of symptoms, was defined as the time when all seven symptoms (cough, sore throat, nasal congestion, headache, feverishness, myalgia, and fatigue) had been assessed by the subject as none or mild for a duration of at least 21.5 hours.In both trials, XOFLUZA treatment at the recommended dose resulted in a statistically significant shorter time to alleviation of symptoms compared with placebo in the primary efficacy population (Tables 5 and 6).Table 5 Time to Alleviation of Symptoms after Single Dose in Adult Subjects with Acute Uncomplicated Influenza in Trial 1 (Median Hours)XOFLUZA 40 mg (95% CICI: Confidence interval) N = 100Placebo (95% CI)N = 100Adults (20 to 64 Years of Age)50 hoursXOFLUZA treatment resulted in a statistically significant shorter time to alleviation of symptoms compared to placebo using the Gehan-Breslow's generalized Wilcoxon test (p-value: 0.014, adjusted for multiplicity). The primary analysis using the Cox Proportional Hazards Model did not reach statistical significance (p-value: 0.165).(45, 64)78 hours(68, 89)Table 6 Time to Alleviation of Symptoms after Single Dose in Subjects 12 Years of Age and Older with Acute Uncomplicated Influenza in Trial 2 (Median Hours)XOFLUZA 40 mg or 80 mgDosing was based on weight. Subjects weighing < 80 kg received a single 40 mg dose and subjects ≥ 80 kg received a single 80 mg dose. (95% CICI: Confidence interval) N = 455Placebo (95% CI)N = 230Subjects (≥ 12 Years of Age)54 hoursXOFLUZA treatment resulted in a statistically significant shorter time to alleviation of symptoms compared to placebo using the Peto-Prentice's generalized Wilcoxon test (p-value: <0.001).(50, 59)80 hours(73, 87)In Trial 2, there was no difference in the time to alleviation of symptoms between subjects who received XOFLUZA (54 hours) and those who received oseltamivir (54 hours). For adolescent subjects (12 to 17 years of age) in Trial 2, the median time to alleviation of symptoms for subjects who received XOFLUZA (N=63) was 54 hours (95% CI of 43, 81) compared to 93 hours (95% CI of 64, 118) in the placebo arm (N=27).The number of subjects who received XOFLUZA at the recommended dose and who were infected with influenza type B virus was limited, including 24 subjects in Trial 1 and 38 subjects in Trial 2. In the influenza B subset in Trial 1, the median time to alleviation of symptoms in subjects who received 40 mg XOFLUZA was 63 hours (95% CI of 43, 70) compared to 83 hours (95% CI of 58, 93) in subjects who received placebo. In the influenza B subset in Trial 2, the median time to alleviation of symptoms in subjects who received 40 mg or 80 mg XOFLUZA was 93 hours (95% CI of 53, 135) compared to 77 hours (95% CI of 47, 189) in subjects who received placebo.

16 How Supplied/Storage And Handling

Product: 50090-4102NDC: 50090-4102-0 2 TABLET, FILM COATED in a BLISTER PACK / 1 in a CARTON

17 Patient Counseling Information

Advise the patient to read the FDA-approved patient labeling (Patient Information).

Spl Patient Package Insert

  • This Patient Information has been approved by the U.S. Food and Drug Administration.Issued: 10/2018  PATIENT INFORMATIONXOFLUZA™ (zoh-FLEW-zuh) (baloxavir marboxil)tabletsWhat is XOFLUZA?XOFLUZA is a prescription medicine used to treat the flu (influenza) in people 12 years of age and older who have had flu symptoms for no more than 48 hours.It is not known if XOFLUZA is safe and effective in children less than 12 years of age or weighing less than 88 pounds (40 kg). Do not take XOFLUZA if you are allergic to baloxavir marboxil or any of the ingredients in XOFLUZA. See the end of this leaflet for a complete list of ingredients in XOFLUZA. Before you take XOFLUZA, tell your healthcare provider about all of your medical conditions, including if you:are pregnant or plan to become pregnant. It is not known if XOFLUZA can harm your unborn baby.are breastfeeding or plan to breastfeed. It is not known if XOFLUZA passes into your breast milk. Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.Talk to your healthcare provider before you receive a live flu vaccine after taking XOFLUZA. How should I take XOFLUZA?Take XOFLUZA exactly as your healthcare provider tells you to. Your healthcare provider will prescribe a single dose of XOFLUZA (which may be more than one tablet).Take XOFLUZA with or without food. Do not take XOFLUZA with dairy products, calcium-fortified beverages, laxatives, antacids or oral supplements containing iron, zinc, selenium, calcium or magnesium.If you take too much XOFLUZA, go to the nearest emergency room right away.What are the possible side effects of XOFLUZA?The most common side effects of XOFLUZA in adults and adolescents include:diarrheabronchitiscommon cold symptoms (nasopharyngitis) headachenausea XOFLUZA is not effective in treating infections other than influenza. Other kinds of infections can appear like flu or occur along with flu and may need different kinds of treatment. Tell your healthcare provider if you feel worse or develop new symptoms during or after treatment with XOFLUZA or if your flu symptoms do not start to get better. These are not all the possible side effects of XOFLUZA.Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800 FDA-1088. How should I store XOFLUZA?Store XOFLUZA at room temperature between 68°F to 77°F (20°C to 25°C). Store XOFLUZA in the blister package that it comes in.Keep XOFLUZA and all medicines out of the reach of children.General information about the safe and effective use of XOFLUZA. Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. Do not use XOFLUZA for a condition for which it was not prescribed. Do not give XOFLUZA to other people, even if they have the same symptoms that you have. It may harm them. You can ask for information about XOFLUZA that is written for health professionals. What are the ingredients in XOFLUZA?Active ingredient: baloxavir marboxilInactive ingredients: croscarmellose sodium, hypromellose, lactose monohydrate, microcrystalline cellulose, povidone, sodium stearyl fumarate, talc, and titanium dioxide.Distributed by: Genentech USA, Inc., A Member of the Roche Group 1 DNA Way, South San Francisco, CA 94080-4990 Manufactured by: Shionogi & Co., Ltd. 2-5-1 Mishima, Settsu, Osaka 566-0022, JapanXOFLUZA™ is a trademark of Genentech, Inc.© 2018 Genentech USA, Inc.For more information, go to www.XOFLUZA.com or call 1-855-XOFLUZA (1-855-963-5892).Representative sample of labeling (see the HOW SUPPLIED section for complete listing):

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