Treats tension (or muscle contraction) headaches. This medicine contains a barbiturate. Side effects – Warnings – How to use National Library of Medicine Brand names: Fioricet, Zebutal, Orbivan, Margesic, Capacet, Esgic-Plus, Esgic Combination of: Caffeine, Acetaminophen, Butalbital Legal status: Schedule III controlled substance Pregnancy risk: Category C (Risk cannot be ruled out) Drug classes: Barbiturate, Central Nervous System Stimulant, Methylxanthine