Open Access Articles- Top Results for Oxaprotiline


Systematic (IUPAC) name
Clinical data
  • Uncontrolled
56433-44-4 7pxN
PubChem CID 38207
ChemSpider 35026 7pxY
ChEMBL CHEMBL1213009 7pxY
Chemical data
Formula C20H23NO
293.40 g/mol
 14pxN (what is this?)  (verify)

Oxaprotiline (C 49-802 BDA), also known as hydroxymaprotiline, is a norepinephrine reuptake inhibitor of the tetracyclic antidepressant family that is related to maprotiline. Though investigated as an antidepressant,[1] it was never marketed.


Oxaprotiline is a racemic compound composed of two isomers, R(−)- or levo- oxaprotiline (levoprotiline; CGP-12,103-A), and S(+)- or dextro- oxaprotiline (dextroprotiline; CGP-12,104-A). Both enantiomers are active, with the levo- form acting merely as an antihistamine and the dextro- form having a more expansive pharmacology (see below), but with both unexpectedly still retaining antidepressant effects.[2]


Dextroprotiline acts as a potent norepinephrine reuptake inhibitor[3][4] and H1 receptor antagonist,[5] as well as a very weak α1-adrenergic receptor antagonist.[3][6] It has negligible affinity for the serotonin transporter,[3] dopamine transporter, α2-adrenergic receptor,[3][6] and muscarinic acetylcholine receptors.[6] Whether it has any antagonistic effects on the 5-HT2 or D2 receptors like its relative maprotiline is unclear.

Levoprotiline acts as a selective H1 receptor antagonist, with no affinity for adrenaline, dopamine, muscarinic acetylcholine, or serotonin receptors, or any of the monoamine transporters.[3][4][5]

See also


  1. ^ Giedke H; Gaertner H; Breyer-Pfaff U; Rein W; Axmann D (1986). "Amitriptyline and oxaprotiline in the treatment of hospitalized depressive patients. Clinical aspects, psychophysiology, and drug plasma levels". European archives of psychiatry and neurological sciences 235 (6): 329–338. PMID 3527706. doi:10.1007/bf00381001. 
  2. ^ Noguchi S, Fukuda Y, Inukai T (May 1992). "Possible contributory role of the central histaminergic system in the forced swimming model". Arzneimittel-Forschung 42 (5): 611–3. PMID 1530672. 
  3. ^ a b c d e Waldmeier PC, Baumann PA, Hauser K, Maitre L, Storni A (June 1982). "Oxaprotiline, a noradrenaline uptake inhibitor with an active and an inactive enantiomer". Biochemical Pharmacology 31 (12): 2169–76. PMID 7115436. doi:10.1016/0006-2952(82)90510-X. 
  4. ^ a b Reimann IW, Firkusny L, Antonin KH, Bieck PR (1993). "Oxaprotiline: enantioselective noradrenaline uptake inhibition indicated by intravenous amine pressor tests but not alpha 2-adrenoceptor binding to intact platelets in man". European Journal of Clinical Pharmacology 44 (1): 93–5. PMID 8382162. doi:10.1007/BF00315288. 
  5. ^ a b Noguchi S, Inukai T, Kuno T, Tanaka C (June 1992). "The suppression of olfactory bulbectomy-induced muricide by antidepressants and antihistamines via histamine H1 receptor blocking". Physiology & Behavior 51 (6): 1123–7. PMID 1353628. doi:10.1016/0031-9384(92)90297-F. 
  6. ^ a b c Richelson E, Nelson A (July 1984). "Antagonism by antidepressants of neurotransmitter receptors of normal human brain in vitro". The Journal of Pharmacology and Experimental Therapeutics 230 (1): 94–102. PMID 6086881.