Tripelennamine

Tripelennamine, sold under the brand name Pyribenzamine by Novartis, is a drug that is used as an antipruritic and first-generation antihistamine. It can be used in the treatment of asthma, hay fever, rhinitis, and urticaria, but is now less common as it has been replaced by newer antihistamines. The drug was patented at CIBA, which merged with Geigy into Ciba-Geigy, and eventually becoming Novartis.

Tripelennamine
Clinical data
Trade namesPyribenzamine
AHFS/Drugs.comMultum Consumer Information
MedlinePlusa601044
Routes of
administration		Oral, intravenous
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
MetabolismHepatic hydroxylation and glucuronidation
Elimination half-life4–6 hours[1]
ExcretionRenal
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.001.910
Chemical and physical data
FormulaC16H21N3
Molar mass255.365 g·mol−1
3D model (JSmol)
  (verify)

Medical uses

Where and when it is/was in common use, tripelennamine is used much like other mildly-anticholinergic antihistamines to treat conditions of the upper respiratory tract arising from illnesses and hay fever. It can be used alone or in combination with other agents to have the desired effect. Cough medicines of the general formula tripelennamine + codeine/dihydrocodine/hydrocodone ± expectorant ± decongestant(s) are popular where available. Among these are the Pyribenzamine cough syrups which contain codeine, with and without decongestants, listed in the 1978 Physicians' Desk Reference; the codeine-tripelennamine synergy is well-known and makes such mixtures more useful for their intended purposes.

Side effects

Tripelennamine is mildly sedating. Other side effects can include irritation, dry mouth, nausea, and dizziness.

Pharmacology

Pharmacodynamics

Tripelennamine acts primarily as an antihistamine, or H1 receptor antagonist. It has little to no anticholinergic activity, with 180-fold selectivity for the H1 receptor over the muscarinic acetylcholine receptors (for comparison, diphenhydramine had 20-fold selectivity for the H1 receptor).[2] In addition to its antihistamine properties, tripelennamine also acts as a weak serotonin-norepinephrine-dopamine reuptake inhibitor (SNDRI).[3][4][5] Because of its SRI properties, tripelennamine was used as the basis for the development of the selective serotonin reuptake inhibitor (SSRI) fluoxetine (Prozac).[6]

Pharmacokinetics

The elimination half-life of tripelennamine is 4 to 6 hours.[1] In a clinical study, the half-life of tripelennamine following intramuscular injection of 50 to 100 mg was 2.9 to 4.4 hours.[7][8]

History

Tripelennamine was first synthesized in 1946 by Carl Djerassi, working in the laboratory of Charles Huttrer at CIBA, shortly after Djerassi got his B.S. It was his first patent.

Society and culture

Availability

Tripelennamine is no longer available in the United States.[9]

See also

References
  1. Lewis R. Goldfrank; Neal Flomenbaum (2006). Goldfrank's toxicologic emergencies. McGraw-Hill Professional. p. 787. ISBN 978-0-07-147914-1. Retrieved 27 November 2011.
  2. Kubo N, Shirakawa O, Kuno T, Tanaka C (March 1987). "Antimuscarinic effects of antihistamines: quantitative evaluation by receptor-binding assay". Jpn J Pharmacol. 43 (3): 277–82. doi:10.1254/jjp.43.277. PMID 2884340.
  3. Oishi R, Shishido S, Yamori M, Saeki K (February 1994). "Comparison of the effects of eleven histamine H1-receptor antagonists on monoamine turnover in the mouse brain". Naunyn-Schmiedeberg's Archives of Pharmacology. 349 (2): 140–4. doi:10.1007/bf00169830. PMID 7513381. S2CID 20653998.
  4. Sato T, Suemaru K, Matsunaga K, Hamaoka S, Gomita Y, Oishi R (May 1996). "Potentiation of L-dopa-induced behavioral excitement by histamine H1-receptor antagonists in mice". Japanese Journal of Pharmacology. 71 (1): 81–4. doi:10.1254/jjp.71.81. PMID 8791174.
  5. Yeh SY, Dersch C, Rothman R, Cadet JL (September 1999). "Effects of antihistamines on 3, 4-methylenedioxymethamphetamine-induced depletion of serotonin in rats". Synapse. 33 (3): 207–17. doi:10.1002/(SICI)1098-2396(19990901)33:3<207::AID-SYN5>3.0.CO;2-8. PMID 10420168.
  6. Healy D (January 2004). Let them eat Prozac: The Unhealthy Relationship Between the Pharmaceutical Industry and Depression. NYU Press. ISBN 978-0-8147-3669-2.
  7. Yeh SY, Todd GD, Johnson RE, Gorodetzky CW, Lange WR (June 1986). "The pharmacokinetics of pentazocine and tripelennamine". Clin Pharmacol Ther. 39 (6): 669–76. doi:10.1038/clpt.1986.117. PMID 3709032.
  8. Sharma A, Hamelin BA (April 2003). "Classic histamine H1 receptor antagonists: a critical review of their metabolic and pharmacokinetic fate from a bird's eye view". Curr Drug Metab. 4 (2): 105–29. doi:10.2174/1389200033489523. PMID 12678691.
  9. https://www.accessdata.fda.gov/scripts/cder/daf/
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