Fioricet is a combination of butalbital and caffeine. Used to treat tension headaches, but can become habit-forming. It is also not the first choice for treating tension-type headaches, as frequent use can worsen headaches. Fioricet comes in the form of hard gelatin capsules for oral administration. Fioricet 40mg is a prescription pain medicine used to treat the symptoms of tension headaches. Fioricet may be used alone or with other medications.