SPL Set ID: fcf0b0fa-bb2c-4f2c-aa9f-1f2da65d8343
1 drug(s) with this SPL Set ID
The active ingredient in famciclovir tablets, USP is famciclovir, an orally administered prodrug of the antiviral agent penciclovir. Chemically, famciclovir is known as 2-[2-(2-amino-9 H -purin-9-yl)ethyl]-1,3-propanediol diacetate. Its molecular formula is C 14 H 19 N 5 O 4 ; its molecular weight is 321.3. It is a synthetic acyclic guanine derivative and has the following structure Famciclovir is a white to pale yellow powder. It is freely soluble in acetone and methanol, and sparingly soluble in ethanol and isopropanol. At 25°C famciclovir is freely soluble (greater than 25% w/v) in water initially, but rapidly precipitates as the sparingly soluble (2% to 3% w/v) monohydrate. Famciclovir is not hygroscopic below 85% relative humidity. Partition coefficients are: octanol/water (pH 4.8) P =1.09 and octanol/phosphate buffer (pH 7.4) P =2.08. Famciclovir tablets, USP contain 125 mg, 250 mg, or 500 mg of famciclovir USP, together with the following inactive ingredients: anhydrous lactose, hydroxypropyl cellulose, hypromellose, magnesium stearate, polyethylene glycol 400, sodium starch glycolate, and titanium dioxide. Chemical Structure