Buy Fioricet Online Overnight Delivery | Order Butalbital Online | What Is Fioricet? : Uses | Side EffectsnnThe medication Fioricet is used to treat tension headaches, and it consists of the three medicine formulas known as Caffeine, Butalbital, and Acetaminophen. Caffeine's work is increasing the effects of Acetaminophen, and Acetaminophen is worked by reducing the pain from the headache.