propoxyphene

Propoxyphene (dextropropoxyphene) is a mild synthetic opioid originally synthesized in the 1950s and primarily marketed in its hydrochloride form as Darvon (65 mg; maximum, 400 mg/day), as propoxyphene napsylate (Darvocet-N 50, Darvocet-N 100), and in Europe, as co-proxamol (32.5 mg dextropropoxyphene plus 325 mg paracetamol).