Propoxyphene (PPX) is a mild narcotic analgesic found in various pharmaceutical preparations, usually as the hydrochloride or napsylate salt. PPX is a prescription narcotic analgesic structurally related to methadone, sold as Darvocet, Darvon, Dolene, Novrad. It is most often combined with aspirin, acetaminophen, caffeine or napsylate to treat mild to moderate pain. In November 2010 the FDA concluded that PPX caused “serious toxicity to the heart, even when used at therapeutic doses.” Subsequently, the FDA requested that manufacturers discontinue production of the drug. Cardiac arrest has been reported with as little as 35mg. Moderate to highly toxic doses of PPX typically result in delusions, hallucinations, confusion, pulmonary edema and cardio toxicity.