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Drug Description Description Dextropropoxyphene is an analgesic in the opioid category, patented in 1955 and manufactured by Eli Lilly and Company. It is an optical isomer of levopropoxyphene. It is intended to treat mild pain and also has antitussive and local anaesthetic effects. Formula: C22H29NO2 Molar mass: 339.471 g/mol CAS ID: 469-62-5 Elimination half-life: 6–12 hours; 30–36 hours (active metabolite, nordextropropoxyphene) ATC code: N02AC04 (WHO) Melting point: 75 °C (167 °F) People also search for: Pethidine, Phencyclidine, Methaqualone,