Fioricet is helpful in treating tension headaches caused by muscle contractions. You can conveniently buy Fioricet online. Fioricet is a combination drug. It consists of acetaminophen, butalbital and caffeine. Acetaminophen is a pain medication that helps relieve pain and reduce fever. Butalbital is barbiturate; it helps in relaxing muscle contractions involved in a tension headache. Caffeine is a CNS stimulant; it relaxes the blood vessels’ muscle contraction and improves the blood flow.