Fioricet 40 mg is a prescription medicine best used for relieving tension related headaches. It works effectively as they relax your muscle contractions, leading to the elimination of your head pain. Fioricet is generally produced by combining three ingredients, namely acetaminophen; the pain reliever, butalbital; a type of barbiturate, and of course, caffeine, which acts as a stimulant. The FDA (Food and Drug Administration) had approved Fioricet back in 1984. During its initial stages, the formulation of the drug included 50 mg butalbital, caffeine 40 mg, and 325 milligrams of acetaminophen. The butalbital actually belongs to barbiturates, a class of drugs that acts as a depressant of the central nervous system. Similar to other barbiturates, barbiturates is the potential of causing dependence, both physical and psychological. This often leads to its abuse. This is why doctors recommend to intake them as per your prescription rather than your will.