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Skeletal formula of melperone
Space-filling model of the melperone molecule
Clinical data
Trade namesBuronil
AHFS/Drugs.comInternational Drug Names
Routes of
Oral, intramuscular injection
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Bioavailability87% (IM), 54% (Oral via syrup), 65% (Oral, tablet)[1]
Protein binding50%
Elimination half-life3–4 hours (oral)[1]
6 hours (IM)
ExcretionRenal (70% as metabolites, 5.5–10.4% as unchanged drug)[1][2]
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.107.027 Edit this at Wikidata
Chemical and physical data
Molar mass263.35 g/mol g·mol−1
3D model (JSmol)

Melperone (Bunil (PT), Buronil (AT, BE, CZ, DK, FL, NL, NO, SE), Eunerpan (DE))[3] is an atypical antipsychotic of the butyrophenone chemical class, making it structurally related to the typical antipsychotic haloperidol. It first entered clinical use in 1960s.[4]

Marketing and indications[edit]

It has been tried in treatment-resistant cases of schizophrenia with some (albeit limited) success.[4][5][6][7] It has also been reported effective in the treatment of L-DOPA and other forms of psychosis in Parkinson's disease[8] (although a multicentre, double-blind, placebo-controlled study conducted in 2012 failed to support these findings[9]). It is also known to possess anxiolytic properties.[10] It is marketed in the following countries:[3]

Adverse effects[edit]

Melperone is reported to produce significantly less weight gain than clozapine and approximately as much weight gain as typical antipsychotics.[11] It is also purported to produce around as much prolactin secretion as clozapine (which is virtually nil).[12] It is also purported to produce sedative effects[13] and QT interval prolongation.[14] It is also known to produce less extrapyramidal side effects than the first-generation (typical) antipsychotic, thiothixene.[15] It can also produce (usually relatively mild) dry mouth.[16]

Other common adverse effects include[17][18][19]
Rare adverse effects include[17][18][19]
Unknown frequency adverse effects include[17][18][19]
  • Seizures (probably rare/uncommon)
  • Increased intraocular pressure
  • Intrahepatic cholestasis (probably rare)
  • Orthostatic hypotension (probably common)
  • Arrhythmias
  • Rash
  • Hyperprolactinemia (which can lead to e.g. galactorrhea, gynecomastia)
  • Weight gain
  • Increased appetite


Melperone is reported to be a CYP2D6 inhibitor.[20][21][22]


Melperone binds to the dopamine D2 receptor, just like all other clinically-utilized antipsychotics, but it does so with a very low affinity and hence may be liable to rapidly dissociate from the D2 receptor hence potentially giving it the profile of an atypical antipsychotic.[23]

Receptor Ki [nM][24]
5-HT1A 2,200
5-HT1D 3,400
5-HT2A 230
5-HT2C 2,100
5-HT6 1,254
5-HT7 578
α1 180
α2 150
M1 >10,000
M2 2,400
M3 >10,000
M4 4,400
M5 >10,000
D2 194
D3 8.95
D4 555
H1 580

See also[edit]


  1. ^ a b c Borgström, L; Larsson, H; Molander, L (1982). "Pharmacokinetics of parenteral and oral melperone in man". European Journal of Clinical Pharmacology. 23 (2): 173–176. doi:10.1007/BF00545974. PMID 7140807.
  2. ^ Product Information: Eunerpan®, Melperonhydrochlorid. Knoll Deutschland GmbH, Ludwigshafen, 1995.
  3. ^ a b Melperone Hydrochloride. Martindale: The Complete Drug Reference. The Royal Pharmaceutical Society of Great Britain. 30 January 2013. Retrieved 3 November 2013.
  4. ^ a b Röhricht, F; Gadhia, S; Alam, R; Willis, M (2012). "Auditing Clinical Outcomes after Introducing Off-Licence Prescribing of Atypical Antipsychotic Melperone for Patients with Treatment Refractory Schizophrenia". Scientific World Journal. 2012: 1–5. doi:10.1100/2012/512047. PMC 3330679. PMID 22566771.
  5. ^ Whiskey, E; Vavrova, M; Gaughran, F; Taylor, D (February 2011). "Melperone in Treatment-Refractory Schizophrenia: A Case Series". Therapeutic Advances in Psychopharmacology. 1 (1): 19–23. doi:10.1177/2045125311399800. PMC 3736899. PMID 23983923.
  6. ^ Meltzer, HY; Sumiyoshi, T; Jayathilake, K (December 2001). "Melperone in the treatment of neuroleptic-resistant schizophrenia". Psychiatry Research. 105 (3): 201–209. doi:10.1016/s0165-1781(01)00346-8. PMID 11814539.
  7. ^ Sumiyoshi, T; Meltzer, HY; Jayathilake, K (2004). "Melperone, an atypical antipsychotic drug, in the treatment of schizophrenia: dose-response analysis on effectiveness and tolerability, and efficacy for treatment-resistant schizophrenia and cognitive function". International Clinical Psychopharmacology. 19 (3): 184. doi:10.1097/00004850-200405000-00039.
  8. ^ Barbato L, Monge A, Stocchi F, Nordera G. Melperone in the treatment of iatrogenic psychosis in Parkinson’s disease. Funct Neurol. 1996 Aug;11(4):201–7.
  9. ^ Friedman, JH (May 2012). "Melperone is ineffective in treating Parkinson's disease psychosis". Movement Disorders. 27 (6): 803–804. doi:10.1002/mds.24942. PMID 22362330.
  10. ^ Pöldinger, WJ (1984). "Melperone in low doses in anxious neurotic patients. A double-blind placebo-controlled clinical study". Neuropsychobiology. 11 (3): 181–186. doi:10.1159/000118074. PMID 6147789.
  11. ^ Bobo, WV; Jayathilake, K; Lee, MA; Meltzer HY (April 2010). "Changes in weight and body mass index during treatment with melperone, clozapine and typical neuroleptics". Psychiatry Research. 176 (2–3): 114–119. doi:10.1016/j.psychres.2009.03.026. PMID 20199813.
  12. ^ Bobo, WV; Jayathilake, K; Lee, MA; Meltzer, HY (July 2009). "Melperone, an aytpical antipsychotic drug with clozapine-like effect on plasma prolactin: contrast with typical neuroleptics". Human Psychopharmacology: Clinical and Experimental. 24 (5): 415–422. doi:10.1002/hup.1036. PMID 19551763.
  13. ^ Molander, L; Borgström, L (1983). "Sedative effects and prolactin response to single oral doses of melperone". Psychopharmacology. 79 (2–3): 142–147. doi:10.1007/bf00427801. PMID 6133301.
  14. ^ Hui, WK; Mitchell, LB; Kavanagh, KM; Gillis, AM; Wyse, DG; Manyari, DE; Duff, HJ (January 1990). "Melperone: electrophysiologic and antiarrhythmic activity in humans". Journal of Cardiovascular Pharmacology. 15 (1): 144–149. doi:10.1097/00005344-199001000-00023. PMID 1688972.
  15. ^ Bjerkenstedt, L (1989). "Melperone in the treatment of schizophrenia". Acta Psychiatrica Scandinavica Supplementum. 352: 35–39. doi:10.1111/j.1600-0447.1989.tb06434.x. PMID 2479227.
  16. ^ Molander, L; Birkhed, D (1981). "Effect of single oral doses of various neuroleptic drugs on salivary secretion rate, pH, and buffer capacity in healthy subjects". Psychopharmacology. 75 (2): 114–118. doi:10.1007/bf00432171. PMID 6119724.
  17. ^ a b c "Product Information: Eunerpan(R), Melperonhydrochlorid". Knoll Deutschland GmbH, Ludwigshafen. 1995. Missing or empty |url= (help)
  18. ^ a b c Kirkegaard, A; Kirkegaard, G; Geismar, L (1981). "Additional studies on side effects of melperone in long-term therapy for 1 to 15 years in psychiatric patients". Arzneimittel-Forschung. 31 (4): 737–740. PMID 6113835.
  19. ^ a b c Christensen, I; Geismar, L; Kirkegaard, A; Kirkegaard, G (May 1986). "Additional studies on side effects of melperone in long-term therapy for 1-20 years in psychiatric patients". Arzneimittel-Forschung. 36 (5): 855–860. PMID 2873821.
  20. ^ Gahr, M; Gastl, R; Kölle, MA; Schönfeldt-Lecuona, C; Freudenmann, RW (2012). "Successful treatment of schizophrenia with melperone augmentation in a patient with phenotypic CYP2D6 ultrarapid metabolization: a case report". Journal of Medical Case Reports. 6 (1): 49. doi:10.1186/1752-1947-6-49. PMC 3298719. PMID 22309430.
  21. ^ Köhnke, MD; Lutz, U; Wiatr, G; Schwärzler, F; Weller, B; Schott, K; Buchkremer, G (April 2006). "Cytochrome P450 2D6 dependent metabolization of risperidone is inhibited by melperone". European Journal of Clinical Pharmacology. 62 (4): 333–334. doi:10.1007/s00228-006-0098-y. PMID 16534635.
  22. ^ Grözinger, M; Dragicevic, A; Hiemke, C; Shams, M; Müller, MJ; Härtter, S (January 2003). "Melperone is an inhibitor of the CYP2D6 catalyzed O-demethylation of venlafaxine". Pharmacopsychiatry. 36 (1): 3–6. doi:10.1055/s-2003-38084. PMID 12649767.
  23. ^ Seeman, P (January 2004). "Atypical Antipsychotics: Mechanism of Action" (PDF). FOCUS: The Journal of Lifelong Learning in Psychiatry. 2 (1): 48–58.[permanent dead link]
  24. ^ Roth, BL; Driscol, J. "PDSP Ki Database". Psychoactive Drug Screening Program (PDSP). University of North Carolina at Chapel Hill and the United States National Institute of Mental Health. Archived from the original on 2013-11-08. Retrieved 2013-10-14.

External links[edit]