Fioricet (Butalbital, Acetaminophen, and Caffeine Tablets, USP) is supplied in tablet form for oral administration.
Each tablet contains the following active ingredients:
butalbital USP . . . . . . . . . .50 mg
acetaminophen USP . . . . 325 mg
caffeine USP . . . . . . . . . . .40 mg
Butalbital (5-allyl-5-isobutylbarbituric acid), is a short to intermediate-acting barbiturate. It has the following structural formula:
Butalbital structural formula.
Acetaminophen (4´-hydroxyacetanilide), is a non-opiate, non-salicylate analgesic and antipyretic. It has the following structural formula:
Caffeine (1,3,7-trimethylxanthine), is a central nervous system stimulant. It has the following structural formula:
Inactive Ingredients: crospovidone, FD&C Blue #1 (aluminum lake), magnesium stearate, microcrystalline cellulose, povidone, pregelatinized starch, and stearic acid.