Propoxyphene
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| Clinical data | |
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| Trade names | Darvon |
| AHFS/Drugs.com | Monograph |
| MedlinePlus | a682325 |
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| Routes of administration |
oral, IV, rectal |
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| Pharmacokinetic data | |
| Bioavailability | 40% |
| Protein binding | 78% |
| Metabolism | Liver-mediated, CYP3A4-mediated N-demethylation (major), aromatic hydroxylation (minor) and ester hydrolysis (minor) |
| Biological half-life | 6–12 hours; 30–36 hours (active metabolite, nordextropropoxyphene) |
| Excretion | Urine (major), breastmilk (minor) |
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| ECHA InfoCard | 100.006.747 |
| Chemical and physical data | |
| Formula | C22H29NO2 |
| Molar mass | 339.471 g/mol |
| 3D model (Jmol) | |
| Melting point | 75 °C (167 °F) |
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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 (cough suppressant) and local anaesthetic effects. The drug has been taken off the market in Europe and the US due to concerns of fatal overdoses and heart arrhythmias. Its onset of analgesia (pain relief) is said to be 20–30 minutes and peak effects are seen about 1.5–2 hours after oral administration.
Dextropropoxyphene is sometimes combined with acetaminophen. Trade names include Darvocet-N and Di-Gesic, Darvon with APAP (for dextropropoxyphene and paracetamol). The British approved name (i.e. the generic name of the active ingredient) of the paracetamol/dextropropoxyphene preparation is "co-proxamol" (sold under a variety of brand names); however, it has been withdrawn since 2007, and is no longer available to new patients, with exceptions. The paracetamol combination(s) are known as Capadex or Di-Gesic in Australia, Lentogesic in South Africa, and Di-Antalvic in France (unlike co-proxamol, which is an approved name, these are all brand names).
Dextropropoxyphene is known under several synonyms, including:
Dextropropoxyphene, like codeine, is a weak opioid, known to cause dependency among recreational users. Codeine is more commonly used; however, as codeine is, in essence, a prodrug that requires in vivo metabolism for efficacy, it is ineffective for some individuals with the "poor metabolizer" genotype of the liver enzyme CYP2D6. In people with this low-function isoform, dextropropoxyphene is particularly useful, as its metabolism does not require CYP2D6. It is also used for patients with digestive complaints, as it is less liable to worsen their symptoms.
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