Flumadine® (rimantadine hydrochloride) is a synthetic antiviral drug available as a 100 mg film-coated tablet and as a syrup for oral administration. Each film-coated tablet contains 100 mg of rimantadine hydrochloride plus hypromellose, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, FD&C Yellow No. 6 Lake and FD&C Yellow No. 6. The film coat contains hypromellose and polyethylene glycol. Each teaspoonful (5 mL) of the syrup contains 50 mg of rimantadine hydrochloride in a dye-free, aqueous solution containing citric acid, parabens (methyl and propyl), saccharin sodium, sorbitol and flavors.

Rimantadine hydrochloride is a white to off-white crystalline powder which is freely soluble in water (50 mg/mL at 20°C). Chemically, rimantadine hydrochloride is alpha-methyltricyclo-[3.3.1.1/3.7]decane-1-methanamine hydrochloride, with an empirical formula of C₁₂H₂₁N•HCI, a molecular weight of 215.77 and the following structural formula:

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