NDC 61919-654 Acyclovir

Product Information

Product Code61919-654
Proprietary Name 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.
Acyclovir
Product Labeler Information What is the Labeler Name?
Name of Company corresponding to the labeler code segment of the Product NDC.
Directrx
Labeler Code61919
Start Marketing Date What is the Start Marketing Date?
This is the date that the labeler indicates was the start of its marketing of the drug product.
01-01-2015
Listing Expiration Date 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.
12-31-2017
Exclude Flag 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".
I
NDC Code Structure

Usage Information


Product Characteristics

Color(s)PINK (C48328)
ShapeHEXAGON (6 SIDED) (C48343)
Size(s)12 MM
Imprint(s)J;49
Score1

Product Packages

NDC 61919-654-30

Package Description: 30 TABLET in 1 BOTTLE

NDC 61919-654-40

Package Description: 40 TABLET in 1 BOTTLE

This product is EXCLUDED from the official NDC directory because the listing data was inactivated by the FDA.

Product Details

Acyclovir is product labeled by Directrx. The product's dosage form is and is administered via form.


What are Acyclovir Active Ingredients?

The following is the list of active ingredients in this product. An active ingredient is the substance responsible for the medicinal effects of a product specified by the substance's molecular structure or if the molecular structure is not known, defined by an unambiguous definition that identifies the substance. Each active ingredient name is the preferred term of the UNII code submitted.

  • ACYCLOVIR (UNII: X4HES1O11F)
  • ACYCLOVIR (UNII: X4HES1O11F) (Active Moiety)


NDC to RxNorm Crosswalk

What is RxNorm? RxNorm is a normalized naming system for generic and branded drugs that assigns unique concept identifier(s) known as RxCUIs to NDC products.The NDC to RxNorm Crosswalk for this produdct code indicates a single concept unique identifier (RXCUI) is associated with this product:


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.

  • COLLOIDAL SILICON DIOXIDE (UNII: ETJ7Z6XBU4)
  • FERRIC OXIDE RED (UNII: 1K09F3G675)
  • MAGNESIUM STEARATE (UNII: 70097M6I30)
  • CELLULOSE, MICROCRYSTALLINE (UNII: OP1R32D61U)
  • POVIDONE (UNII: FZ989GH94E)
  • SODIUM STARCH GLYCOLATE TYPE A POTATO (UNII: 5856J3G2A2)


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Patient Education

Acyclovir

Acyclovir is pronounced as (ay sye' kloe veer)

Why is acyclovir medication prescribed?
Acyclovir is used to decrease pain and speed the healing of sores or blisters in people who have varicella (chickenpox)), herpes zoster (shingles; a rash that can occur i...
[Read More]

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Acyclovir Labeling and Warnings

FDA filings in the form of structured product labels are documents that include all published material associated whith this product. Product label information includes data like indications and usage generic names, contraindications, active ingredients, strength dosage, routes of administration, appearance, usage, warnings, inactive ingredients, etc.

Table of Contents



Description Section



Acyclovir is a synthetic nucleoside analogue active against herpesviruses. Acyclovir tablets, USP is a formulation for oral administration.
Each Acyclovir Tablet contains 400 mg or 800 mg of acyclovir. In addition, each tablet contains the inactive ingredients colloidal silicon dioxide, magnesium stearate, microcrystalline cellulose, povidone and sodium starch glycolate. The 400 mg and 800 mg tablet also contains ferric oxide and FD&C blue lake # 2 Indigo carmine AL, respectively.
Acyclovir USP is a white to off white crystalline powder, slightly hygroscopic with the molecular formula C8H11N5O3 and a molecular weight of 225.20. The maximum solubility in water at 37°C is 2.5 mg/mL. The pka's of acyclovir are 2.27 and 9.25.
The chemical name of acyclovir is 6H-Purin-6-one, 2-amino-1,9-dihydro-9-[(2-hydroxyethoxy)methyl]-.


Clinical Pharmacology Section



    Pharmacokinetics

    The pharmacokinetics of acyclovir after oral administration have been evaluated in healthy volunteers and in immunocompromised patients with herpes simplex or varicella-zoster virus infection. Acyclovir pharmacokinetic parameters are summarized in Table 1.     
    Table 1. Acyclovir Pharmacokinetic Characteristics (Range)



    Parameter

    Range

    Plasma protein binding

    9% to 33%

    Plasma elemination half-life

    2.5 to 3.3 hr

    Average oral bioavailability

    10% to 20%*

    *Bioavailability decreases with increasing dose.
    In one multiple-dose, crossover study in healthy subjects (n = 23), it was shown that increases in plasma acyclovir concentrations were less than dose proportional with increasing dose, as shown in Table 2. The decrease in bioavailability is a function of the dose and not the dosage form.
    Table 2. Acyclovir Peak and Trough Concentrations at Steady State



    Parameter

    200 mg

    400 mg

    800 mg

    Cssmax
    0.83 mcg/mL
    1.21 mcg/mL

    1.61 mcg/mL
     Csstrough0.46 mcg/mL
    0.63 mcg/mL

    0.83 mcg/mL

    There was no effect of food on the absorption of acyclovir (n = 6); therefore, acyclovir tablets may be administered with or without food.
    The only known urinary metabolite is 9-[(carboxymethoxy)methyl]guanine.

    Special Populations

    Adults With Impaired Renal Function:The half-life and total body clearance of acyclovir are dependent on renal function. A dosage adjustment is recommended for patients with reduced renal function (see DOSAGE AND ADMINISTRATION).
    Geriatrics: Acyclovir plasma concentrations are higher in geriatric patients compared with younger adults, in part due to age-related changes in renal function. Dosage reduction may be required in geriatric patients with underlying renal impairment (see PRECAUTIONS: Geriatric Use).
    Pediatrics: In general, the pharmacokinetics of acyclovir in pediatric patients is similar to that of adults. Mean half-life after oral doses of 300 mg/m2 and 600 mg/m2 in pediatric patients aged 7 months to 7 years was 2.6 hours (range 1.59 to 3.74 hours).

    Drug Interactions

    Coadministration of probenecid with intravenous acyclovir has been shown to increase the mean acyclovir half-life and the area under the concentration-time curve. Urinary excretion and renal clearance were correspondingly reduced.

    Clinical Trials

    Initial Genital Herpes: Double-blind, placebo-controlled studies have demonstrated that orally administered acyclovir tablets significantly reduced the duration of acute infection and duration of lesion healing. The duration of pain and new lesion formation was decreased in some patient groups.
    Recurrent Genital Herpes: Double-blind, placebo-controlled studies in patients with frequent recurrences (6 or more episodes per year) have shown that orally administered acyclovir tablets given daily for 4 months to 10 years prevented or reduced the frequency and/or severity of recurrences in greater than 95% of patients.
    In a study of patients who received acyclovir tablets 400 mg twice daily for 3 years, 45%, 52%, and 63% of patients remained free of recurrences in the first, second, and third years, respectively. Serial analyses of the 3-month recurrence rates for the patients showed that 71% to 87% were recurrence free in each quarter.
    Herpes Zoster Infections: In a double-blind, placebo-controlled study of immunocompetent patients with localized cutaneous zoster infection, acyclovir tablets (800 mg 5 times daily for 10 days) shortened the times to lesion scabbing, healing, and complete cessation of pain, and reduced the duration of viral shedding and the duration of new lesion formation.
    In a similar double-blind, placebo-controlled study, acyclovir tablets (800 mg 5 times daily for 7 days) shortened the times to complete lesion scabbing, healing, and cessation of pain; reduced the duration of new lesion formation; and reduced the prevalence of localized zoster-associated neurologic symptoms (paresthesia, dysesthesia, or hyperesthesia).
    Treatment was begun within 72 hours of rash onset and was most effective if started within the first 48 hours.
     Adults greater than 50 years of age showed greater benefit.
    Chickenpox: Three randomized, double-blind, placebo-controlled trials were conducted in 993 pediatric patients aged 2 to 18 years with chickenpox. All patients were treated within 24 hours after the onset of rash. In 2 trials, acyclovir tablets were administered at 20 mg/kg 4 times daily (up to 3,200 mg per day) for 5 days. In the third trial, doses of 10, 15, or 20 mg/kg were administered 4 times daily for 5 to 7 days. Treatment with acyclovir tablets shortened the time to 50% healing; reduced the maximum number of lesions; reduced the median number of vesicles; decreased the median number of residual lesions on day 28; and decreased the proportion of patients with fever, anorexia, and lethargy by day 2. Treatment with acyclovir tablets did not affect varicella-zoster virus-specific humoral or cellular immune responses at 1 month or 1 year following treatment.

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Indications & Usage Section




    Herpes Zoster Infections: Acyclovir tablets, USP are indicated for the acute treatment of herpes zoster (shingles).
    Genital Herpes: Acyclovir tablets, USP are indicated for the treatment of initial episodes and the management of recurrent episodes of genital herpes.
    Chickenpox: Acyclovir tablets, USP are indicated for the treatment of chickenpox (varicella).


Contraindications Section



Acyclovir tablets are contraindicated for patients who develop hypersensitivity to acyclovir or valacyclovir.


Warnings Section



Acyclovir tablets are intended for oral ingestion only. Renal failure, in some cases resulting in death, has been observed with acyclovir therapy (see ADVERSE REACTIONS: Observed During Clinical Practice and OVERDOSAGE). Thrombotic thrombocytopenic purpura/hemolytic uremic syndrome (TTP/HUS), which has resulted in death, has occurred in immunocompromised patients receiving acyclovir therapy.


Precautions Section



    Dosage adjustment is recommended when administering acyclovir tablets to patients with renal impairment (see DOSAGE AND ADMINISTRATION). Caution should also be exercised when administering acyclovir tablets to patients receiving potentially nephrotoxic agents since this may increase the risk of renal dysfunction and/or the risk of reversible central nervous system symptoms such as those that have been reported in patients treated with intravenous acyclovir. Adequate hydration should be maintained.

    Information for Patients

    Patients are instructed to consult with their physician if they experience severe or troublesome adverse reactions, they become pregnant or intend to become pregnant, they intend to breastfeed while taking orally administered acyclovir tablets or they have any other questions.
    Patients should be advised to maintain adequate hydration.
    Herpes Zoster: There are no data on treatment initiated more than 72 hours after onset of the zoster rash. Patients should be advised to initiate treatment as soon as possible after a diagnosis of herpes zoster.
    Genital Herpes Infections: Patients should be informed that acyclovir tablets is not a cure for genital herpes. There are no data evaluating whether acyclovir tablets will prevent transmission of infection to others. Because genital herpes is a sexually transmitted disease, patients should avoid contact with lesions or intercourse when lesions and/or symptoms are present to avoid infecting partners. Genital herpes can also be transmitted in the absence of symptoms through asymptomatic viral shedding. If medical management of a genital herpes recurrence is indicated, patients should be advised to initiate therapy at the first sign or symptom of an episode.
    Chickenpox: Chickenpox in otherwise healthy children is usually a self-limited disease of mild to moderate severity. Adolescents and adults tend to have more severe disease. Treatment was initiated within 24 hours of the typical chickenpox rash in the controlled studies, and there is no information regarding the effects of treatment begun later in the disease course.

    Drug Interactions

    See CLINICAL PHARMACOLOGY: Pharmacokinetics.

    Carcinogenesis & Mutagenesis & Impairment Of Fertility

    The data presented below include references to peak steady-state plasma acyclovir concentrations observed in humans treated with 800 mg given orally 5 times a day (dosing appropriate for treatment of herpes zoster) or 200 mg given orally 5 times a day (dosing appropriate for treatment of genital herpes). Plasma drug concentrations in animal studies are expressed as multiples of human exposure to acyclovir at the higher and lower dosing schedules (see CLINICAL PHARMACOLOGY: Pharmacokinetics).
    Acyclovir was tested in lifetime bioassays in rats and mice at single daily doses of up to 450 mg/kg administered by gavage. There was no statistically significant difference in the incidence of tumors between treated and control animals, nor did acyclovir shorten the latency of tumors. Maximum plasma concentrations were 3 to 6 times human levels in the mouse bioassay and 1 to 2 times human levels in the rat bioassay.
    Acyclovir was tested in 16 in vitro and in vivo genetic toxicity assays. Acyclovir was positive in 5 of the assays.
    Acyclovir did not impair fertility or reproduction in mice (450 mg/kg/day, p.o.) or in rats (25 mg/kg/day, s.c.). In the mouse study, plasma levels were 9 to 18 times human levels, while in the rat study, they were 8 to 15 times human levels. At higher doses (50 mg/kg/day, s.c.) in rats and rabbits (11 to 22 and 16 to 31 times human levels, respectively) implantation efficacy, but not litter size, was decreased. In a rat peri- and post-natal study at 50 mg/kg/day, s.c., there was a statistically significant decrease in group mean numbers of corpora lutea, total implantation sites, and live fetuses.
    No testicular abnormalities were seen in dogs given 50 mg/kg/day, IV for 1 month (21 to 41 times human levels) or in dogs given 60 mg/kg/day orally for 1 year (6 to 12 times human levels). Testicular atrophy and aspermatogenesis were observed in rats and dogs at higher dose levels.

    Pregnancy

    Teratogenic Effects: Pregnancy Category B. Acyclovir administered during organogenesis was not teratogenic in the mouse (450 mg/kg/day, p.o.), rabbit (50 mg/kg/day, s.c. and IV), or rat (50 mg/kg/day, s.c.). These exposures resulted in plasma levels 9 and 18, 16 and 106, and 11 and 22 times, respectively, human levels.
    There are no adequate and well-controlled studies in pregnant women. A prospective epidemiologic registry of acyclovir use during pregnancy was established in 1984 and completed in April 1999. There were 749 pregnancies followed in women exposed to systemic acyclovir during the first trimester of pregnancy resulting in 756 outcomes. The occurrence rate of birth defects approximates that found in the general population. However, the small size of the registry is insufficient to evaluate the risk for less common defects or to permit reliable or definitive conclusions regarding the safety of acyclovir in pregnant women and their developing fetuses. Acyclovir should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

    Nursing Mothers

    Acyclovir concentrations have been documented in breast milk in 2 women following oral administration of acyclovir tablets and ranged from 0.6 to 4.1 times corresponding plasma levels. These concentrations would potentially expose the nursing infant to a dose of acyclovir up to 0.3 mg/kg/day. Acyclovir tablets should be administered to a nursing mother with caution and only when indicated.

    Pediatric Use

    Safety and effectiveness of oral formulations of acyclovir in pediatric patients younger than 2 years of age have not been established.

    Geriatric Use

    Of 376 subjects who received acyclovir tablets in a clinical study of herpes zoster treatment in immunocompetent subjects ≥50 years of age, 244 were 65 and over while 111 were 75 and over. No overall differences in effectiveness for time to cessation of new lesion formation or time to healing were reported between geriatric subjects and younger adult subjects. The duration of pain after healing was longer in patients 65 and over. Nausea, vomiting, and dizziness were reported more frequently in elderly subjects. Elderly patients are more likely to have reduced renal function and require dose reduction. Elderly patients are also more likely to have renal or CNS adverse events. With respect to CNS adverse events observed during clinical practice, somnolence, hallucinations, confusion, and coma were reported more frequently in elderly patients (see CLINICAL PHARMACOLOGY, ADVERSE REACTIONS: Observed During Clinical Practice, and DOSAGE AND ADMINISTRATION).


Adverse Reactions Section



    Herpes Simplex

    Short-Term Administration: The most frequent adverse events reported during clinical trials of treatment of genital herpes with acyclovir tablets 200 mg administered orally 5 times daily every 4 hours for 10 days were nausea and/or vomiting in 8 of 298 patient treatments (2.7%). Nausea and/or vomiting occurred in 2 of 287 (0.7%) patients who received placebo.
    Long-Term Administration: The most frequent adverse events reported in a clinical trial for the prevention of recurrences with continuous administration of 400 mg (two 200-mg capsules) 2 times daily for 1 year in 586 patients treated with acyclovir tablets were nausea (4.8%) and diarrhea (2.4%). The 589 control patients receiving intermittent treatment of recurrences with acyclovir tablets for 1 year reported diarrhea (2.7%), nausea (2.4%), and headache (2.2%).

    Herpes Zoster

    The most frequent adverse event reported during 3 clinical trials of treatment of herpes zoster (shingles) with 800 mg of oral acyclovir tablets 5 times daily for 7 to 10 days in 323 patients was malaise (11.5%). The 323 placebo recipients reported malaise (11.1%).

    Chickenpox

    The most frequent adverse event reported during 3 clinical trials of treatment of chickenpox with oral acyclovir tablets at doses of 10 to 20 mg/kg 4 times daily for 5 to 7 days or 800 mg 4 times daily for 5 days in 495 patients was diarrhea (3.2%). The 498 patients receiving placebo reported diarrhea (2.2%).

    Observed During Clinical Practice

    In addition to adverse events reported from clinical trials, the following events have been identified during post-approval use of acyclovir tablets. Because they are reported voluntarily from a population of unknown size, estimates of frequency cannot be made. These events have been chosen for inclusion due to either their seriousness, frequency of reporting, potential causal connection to acyclovir tablets or a combination of these factors.
    General: Anaphylaxis, angioedema, fever, headache, pain, peripheral edema.
    Nervous: Aggressive behavior, agitation, ataxia, coma, confusion, decreased consciousness, delirium, dizziness, dysarthria, encephalopathy, hallucinations, paresthesia, psychosis, seizure, somnolence, tremors. These symptoms may be marked, particularly in older adults or in patients with renal impairment (see PRECAUTIONS).
    Digestive: Diarrhea, gastrointestinal distress, nausea.
    Hematologic and Lymphatic: Anemia, leukocytoclastic vasculitis, leukopenia, lymphadenopathy, thrombocytopenia.
    Hepatobiliary Tract and Pancreas: Elevated liver function tests, hepatitis, hyperbilirubinemia, jaundice.
    Musculoskeletal: Myalgia.
    Skin: Alopecia, erythema multiforme, photosensitive rash, pruritus, rash, Stevens-Johnson syndrome, toxic epidermal necrolysis, urticaria.
    Special Senses: Visual abnormalities.
    Urogenital: Renal failure, renal pain (may be associated with renal failure), elevated blood urea nitrogen, elevated creatinine, hematuria (see WARNINGS).


Overdosage Section



Overdoses involving ingestion of up to 100 capsules (20 g) have been reported. Adverse events that have been reported in association with overdosage include agitation, coma, seizures, and lethargy. Precipitation of acyclovir in renal tubules may occur when the solubility (2.5 mg/mL) is exceeded in the intratubular fluid. Overdosage has been reported following bolus injections or inappropriately high doses and in patients whose fluid and electrolyte balance were not properly monitored. This has resulted in elevated BUN and serum creatinine and subsequent renal failure. In the event of acute renal failure and anuria, the patient may benefit from hemodialysis until renal function is restored (see DOSAGE AND ADMINISTRATION).


Dosage & Administration Section



Acute Treatment of Herpes Zoster: 800 mg every 4 hours orally, 5 times daily for 7 to 10 days.
Genital Herpes: Treatment of Initial Genital Herpes: 200 mg every 4 hours, 5 times daily for 10 days.
Chronic Suppressive Therapy for Recurrent Disease: 400 mg 2 times daily for up to 12 months, followed by re-evaluation. Alternative regimens have included doses ranging from 200 mg 3 times daily to 200 mg 5 times daily.
The frequency and severity of episodes of untreated genital herpes may change over time. After 1 year of therapy, the frequency and severity of the patient’s genital herpes infection should be re-evaluated to assess the need for continuation of therapy with acyclovir tablets.
Intermittent Therapy: 200 mg every 4 hours, 5 times daily for 5 days. Therapy should be initiated at the earliest sign or symptom (prodrome) of recurrence.
Treatment of Chickenpox: Children (2 years of age and older): 20 mg/kg per dose orally 4 times daily (80 mg/kg/day) for 5 days. Children over 40 kg should receive the adult dose for chickenpox.
Adults and Children over 40 kg: 800 mg 4 times daily for 5 days.
Intravenous acyclovir is indicated for the treatment of varicella-zoster infections in immunocompromised patients.
When therapy is indicated, it should be initiated at the earliest sign or symptom of chickenpox. There is no information about the efficacy of therapy initiated more than 24 hours after onset of signs and symptoms.
Patients With Acute or Chronic Renal Impairment: In patients with renal impairment, the dose of acyclovir tablets should be modified as shown in Table 3.
Table 3. Dosage Modification for Renal Impairment

Normal Dosage Regimen
Creatinine Clearance
(mL/min/1.73 m2)
Adjusted Dosage Regimen

Dose (mg)
Dosing Interval
200 mg every 4 hours

> 10
0-10
200
200
every 4 hours, 5x daily
every 12 hours

400 mg every 12 hours
> 10
0-10
400
200
every 12 hours

every 12 hours
800 mg every 4 hours
> 25
10-25
0-10
800
800
800
every 4 hours, 5x daily
every 8 hours

every 12 hours

Hemodialysis: For patients who require hemodialysis, the mean plasma half-life of acyclovir during hemodialysis is approximately 5 hours. This results in a 60% decrease in plasma concentrations following a 6-hour dialysis period. Therefore, the patient’s dosing schedule should be adjusted so that an additional dose is administered after each dialysis.
Peritoneal Dialysis: No supplemental dose appears to be necessary after adjustment of the dosing interval.


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