fioricet 40mg is used to treat tension and headache when other medicines have not worked. It is a combination medicine that can be habit-forming if used for a long time. It can also make headaches worse if overused, so it is not the first option for treating tension headaches. Fioricet with codeine combines four medicines to help relieve tension headaches. Tension headaches are usually related to tension and cause muscle stiffness and pain around the forehead and neck.

Butalbital is a short to intermediate-acting barbiturate that works in the brain to help the patient relax.

Acetaminophen is a non-opiate, non-salicylate analgesic and antipyretic. It inhibits chemicals in the brain to help treat mild to moderate pain.

Caffeine is an adenosine antagonist and a central nervous system stimulant that works by blocking a natural chemical called adenosine in the body. It is not clear how caffeine works in headache conditions, but it is believed to boost the pain-relieving activity of acetaminophen.

The IUPAC name of Butalbital is 5-allyl-5-isobutyl barbituric acid and the chemical formula is C11H16N2O3 with a molecular weight of 224.26 g/mol.

Chemical structure of Acetaminophen (C8H9NO2)

The IUPAC name of Caffeine is 1,3,7-trimethylxanthine and the chemical formula is C8H10N4O2 with a molecular weight of 149.19 g/mol.

The chemical structure of Caffeine (C8H10N4O2) is given below.

Chemical structure of Caffeine (C8H10N4O2)