|Elimination half-life||5.2 hours|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||275.396 g·mol−1|
|3D model (JSmol)|
|(what is this?)|
Propiram (Algeril, Dirame, Bay 4503) is a partial mu opioid receptor agonist and weak mu antagonist analgesic from the ampromide family of drugs related to other drugs such as phenampromide and diampromide. It was invented in 1963 in the United Kingdom by Bayer but was not widely marketed, although it saw some limited clinical use, especially in dentistry. Propiram reached Phase III clinical trials in the United States and Canada.
Propiram exhibits weak opioid antagonist activity on the mu receptor—quite a bit weaker than its agonist effects—and the effect on kappa and delta opioid, sigma receptors, or the NMDA system are not well understood. Other drugs of the partial mu-opioid agonist/antagonist type include meptazinol, buprenorphine, butorphanol, phenazocine, nalbuphine, pentazocine, dezocine and its relatives.
With about 10% of the analgesic potency of morphine, 50 mg of propiram is equivalent to about 60 mg of codeine or 50 mg of pentazocine. In many patients, propiram is an effective analgesic comparable to other drugs such as these as well as pethidine, with a normal dose of around 50–100 mg and a duration of action of 3 to 6 hours. It is more potent and effective than codeine, and longer-lasting and with a faster onset of action compared to pethidine. Side effects include sedation, dizziness, nausea and vomiting. Propiram has been available in oral, rectal, and injectable formulations, with bioavailability above 97% after oral administration.
Many related compounds are known, although only propiram was ever commercialized. The addition of a 4-phenyl group on the piperidine increases potency by a factor of 133x compared to the parent compound. Addition of a 3,3-dimethyl moiety to the piperidine ring increases potency by 45x compared to the title compound  and 3D overlay using CHARMM shows that this class overlays the fentanyl scaffold in the positioning of aryl groups, basic nitrogen and amide moieties perfectly.
Propiram is currently a Schedule I/Narcotic controlled substance in the United States with an ACSCN of 9649 and a zero annual aggregate manufacturing quota as of 2014. It has been almost exclusively formulated as the fumarate salt.
- U.S. Patent 3,163,654
- Drug Facts & Comparisons (56th ed.). 2002.
- Wilson RS, Landers JH (December 1982). "Use of a new oral analgesic, propiram fumarate, in treating postoperative ocular pain". Annals of Ophthalmology. 14 (12): 1172–4. PMID 7165237.
- Desjardins PJ, Cooper SA, Gallegos TL, Allwein JB, Reynolds DC, Kruger GO, Beaver WT (January 1984). "The relative analgesic efficacy of propiram fumarate, codeine, aspirin, and placebo in post-impaction dental pain". Journal of Clinical Pharmacology. 24 (1): 35–42. doi:10.1002/j.1552-4604.1984.tb01811.x. PMID 6368614.
- Korduba CA, Veals J, Radwanski E, Symchowicz S, Chung M (May 1981). "Bioavailability of orally administered propiram fumarate in humans". Journal of Pharmaceutical Sciences. 70 (5): 521–3. doi:10.1002/jps.2600700515. PMID 7241356.
- Goa KL, Brogden RN (September 1993). "Propiram. A review of its pharmacodynamic and pharmacokinetic properties, and clinical use as an analgesic". Drugs. 46 (3): 428–445. doi:10.2165/00003495-199346030-00008. PMID 7693433.
- Hiltmann R, Hoffmeister F, Niemers E, Schlichting U, Wollweber H (April 1974). "[2-Acylaminopyridine derivatives with morphine agonistic and morphine antagonistic effects]". Arzneimittel-Forschung. 24 (4): 584–600. PMID 4406861.
- Wollweber H. Stereochemische Untersuchungen über Arzneimittel. European Journal of Medicinal Chemistry 1982; 17: 125–133.