Buy Fioricet online for treating migraines; it is a combination of Butalbital, Acetaminophen, and Caffeine. Butalbital is from the group of medications known as barbiturates; it relaxes muscle contractions associated with blood vessels to enhance blood flow. Acetaminophen reduces fever and relieves pain. Caffeine is a central nervous system; it relaxes muscle contractions muscle contractions in blood vessels to improve blood flow.