• It's Duradrin. (The code is actually DPI 364, not OP1 364.) It is a combination of acetaminophen, dichloralphenazone, and isometheptene. It is used to treat tension (or muscle contraction) and vascular (migraine) headaches. Acetaminophen is a pain reliever and a fever reducer. Dichloralphenazone is a sedative that slows down your central nervous system (brain and nerve impulses), causing relaxation and pain relief. Isometheptene causes constriction (narrowing) of blood vessels (arteries and veins). This is important in the treatment of headaches. Acetaminophen, dichloralphenazone, and isometheptene may also be used for purposes other than those listed in this medication guide. SOURCE:

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