Fioricet is a combination medication. The active ingredients include butalbital, caffeine and acetaminophen. Butalbital belongs to the group of medicines known as barbiturates, while acetaminophen is a fever reducer and pain reliever. Caffeine works in the central nervous system as a stimulant. It works to ease the muscle contractions that occur in the blood vessels and improves the blood flow. Firoicet is prescribed for the treatment of tension headaches that are usually caused from muscle contractions.