Rimantadine Hydrochloride

Generic Name: rimantadine hydrochloride

Over-the-Counter (OTC)

Brand Names:

DESCRIPTION Rimantadine hydrochloride, USP is a synthetic antiviral drug available as a 100 mg film-coated tablet. Each film-coated tablet contains 100 mg of rimantadine hydrochloride, USP. In addition, each tablet contains the following inactive ingredients: hypromellose, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, type A and FD&C Yellow No. 6 Aluminium Lake. Film coating material, Opadry (YS-1-19025-A), contains hypromellose and polyethylene glycol.

Overview

Uses

INDICATIONS AND USAGE Rimantadine hydrochloride tablet is indicated for the prophylaxis and treatment of illness caused by various strains of influenza A virus in adults (17 years and older). Rimantadine hydrochloride tablet is indicated for prophylaxis against influenza A virus in children (1 year to 16 years of age). Prophylaxis In controlled studies of children (1 year to 16 years of age), healthy adults (17 years and older), and elderly patients (65 years of age and older), rimantadine hydrochloride has been shown to be safe and effective in preventing signs and symptoms of infection caused by various strains of influenza A virus.

Dosage

DOSAGE AND ADMINISTRATION For Prophylaxis in Adults and Children Adults (17 years and older) The recommended adult dose of rimantadine hydrochloride is 100 mg twice a day. Study durations ranged from 11 days to 6 weeks in adult and elderly patients. In patients with severe hepatic dysfunction, severe renal impairment (CrCl 5 to 29 mL/min) or renal failure (CrCl ≤ 10 mL/min) and in elderly nursing home patients, a dose reduction to 100 mg daily is recommended. Because of the potential for accumulation of rimantadine metabolites during multiple dosing, patients with hepatic or renal impairment should be monitored for adverse effects. Children (1 year to 16 years of age) Study duration ranged from 5 weeks to 6 weeks in pediatric subjects.

Side Effects

ADVERSE REACTIONS In 1,027 patients treated with rimantadine hydrochloride in controlled clinical trials at the recommended dose of 200 mg daily, the most frequently reported adverse events involved the gastrointestinal and nervous systems. Incidence >1%: Adverse events reported most frequently (1 % to 3%) at the recommended dose in controlled clinical trials are shown in the table below.

Interactions

Drug Interactions Acetaminophen: Rimantadine hydrochloride, 100 mg, was given twice daily for 13 days to 12 healthy volunteers. On day 11, acetaminophen (650 mg four times daily) was started and continued for 8 days. The pharmacokinetics of rimantadine were assessed on days 11 and 13. Co-administration with acetaminophen reduced the peak concentration and AUC values for rimantadine by approximately 11%. Aspirin: Rimantadine hydrochloride, 100 mg, was given twice daily for 13 days to 12 healthy volunteers. On day 11, aspirin (650 mg, four times daily) was started and continued for 8 days. The pharmacokinetics of rimantadine were assessed on days 11 and 13. Peak plasma concentrations and AUC of rimantadine were reduced approximately 10% in the presence of aspirin.

Warnings

CONTRAINDICATIONS Rimantadine hydrochloride tablet is contraindicated in patients with known hypersensitivity to drugs of the adamantane class, including rimantadine and amantadine.

Pregnancy

Pregnancy Teratogenic Effects : There are no adequate and well-controlled studies in pregnant women. Rimantadine is reported to cross the placenta in mice. Rimantadine has been shown to be embryotoxic in rats when given at a dose of 200 mg/kg/d (11 times the MRHD based on mg/m 2 ). At this dose the embryotoxic effect consisted of increased fetal resorption in rats; this dose also produced a variety of maternal effects including ataxia, tremors, convulsions and significantly reduced weight gain.

Storage

HOW SUPPLIED Rimantadine Hydrochloride Tablets USP, 100 mg — Each orange, oval, film-coated, convex-faced tablet is debossed with "G" on one side and "1911" on the other side. They are available as follows: Bottles of 100: NDC 0115-1911-01 Bottles of 500: NDC 0115-1911-02 Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].

Frequently Asked Questions

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CONTRAINDICATIONS Rimantadine hydrochloride tablet is contraindicated in patients with known hypersensitivity to drugs of the adamantane class, including rimantadine and amantadine.

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Medical Disclaimer

This drug information is for educational purposes only and should not replace professional medical advice. Drug information is sourced from the FDA National Drug Code Directory and Structured Product Labeling. Always consult with a healthcare provider before starting, stopping, or changing any medication.