Manufactured and distributed by Eli Lilly and Company, Darvocet is a brand name for mild narcotic analgesic drug which combines Acetaminophen and Propoxy or Propoxyphene, prescribed for the relief of mild to moderate pain, with or without fever.. It is sold as: Darvocet A500, Darvocet N 100, Darvocet N 50, Propacet 100, Wygesic, Darvon-N (propoxyphene napsylate), Darvon (propoxyphene hydrochloride), Darvon Compound-65 (propoxyphene hydrochloride, aspirin, and caffeine).

Darvocet-N, Pronounced: DAR-voe-set en contains Propoxyphene napsylate and Acetaminophen. Propoxyphene napsylate, USP is an odorless, white, crystalline powder with a bitter taste. It is very slightly soluble in water and soluble in methanol, ethanol, chloroform, and acetone. Chemically, it is (aS,1R)-a-[2-(Dimethylamino)-1-methylethyl]-a-phenylphenethyl propionate compound with 2-naphthalenesulfonic acid (1:1) monohydrate. Its molecular weight is 565.72.

In long term use, some patients can develop renal toxicity due to the acetoaminophen part of Darvocet. Also, Propoxyphene may be habit forming. Physical and/or psychological dependence can occur, and withdrawal effects are possible if the medication is stopped suddenly after prolonged or high-dose treatment.