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Systematic (IUPAC) name
Clinical data
Trade names Buronil
Legal status
  • Prescription only
Routes Oral, intramuscular injection
Pharmacokinetic data
Bioavailability 87% ([1]
Protein binding 50%
Metabolism Hepatic
Half-life 3–4 hours (oral)[1]
6 hours (IM)
Excretion Renal, 70% as metabolites, 5.5-10.4% as unchanged drug[1][2]
CAS number  YesY
ATC code N05
ChemSpider  YesY
Chemical data
Formula C16H22FNO 
Mol. mass 263.35 g/mol

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 1
  • Adverse effects 2
    • Interactions 2.1
  • Pharmacology 3
  • References 4
  • External links 5

Marketing and indications

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

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 nill).[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]

* tremor, dystonia, hypokinesis, akathisia, dyskinesias

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
  • Hyperprolactinaemia**
  • Weight gain
  • Increased appetite

** which can lead to galactorrhoea, gynecomastia, etc.


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


Melperone binds to the dopamine D2 receptor, just like all other clinically-utilised 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


  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.  
  2. ^ Product Information: Eunerpan(R), 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: 512047.  
  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.  
  6. ^ Meltzer, HY; Sumiyoshi, T; Jayathilake, K (December 2001). "Melperone in the treatment of neuroleptic-resistant schizophrenia.". Psychiatry Research 105 (3): 201–209.  
  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.  
  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.  
  10. ^ Pöldinger, WJ (1984). "Melperone in low doses in anxious neurotic patients. A double-blind placebo-controlled clinical study". Neuropsychobiology 11 (3): 181–186.  
  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.  
  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.  
  13. ^ Molander, L; Borgström, L (1983). "Sedative effects and prolactin response to single oral doses of melperone". Psychopharmacology 79 (2-3): 142–147.  
  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.  
  15. ^ Bjerkenstedt, L (1989). "Melperone in the treatment of schizophrenia". Acta Psychiatrica Scandinavica Supplementum 352: 35–39.  
  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.  
  17. ^ a b c "Product Information: Eunerpan(R), Melperonhydrochlorid". Knoll Deutschland GmbH, Ludwigshafen. 1995. 
  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.  
  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.  
  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.  
  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.  
  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.  
  23. ^ Seeman, P (January 2004). "Atypical Antipsychotics: Mechanism of Action" (PDF). FOCUS: The Journal of Lifelong Learning in Psychiatry 2 (1): 48–58. 
  24. ^ Roth, BL; Driscol, J. Database"i"PDSP K. Psychoactive Drug Screening Program (PDSP). University of North Carolina at Chapel Hill and the United States National Institute of Mental Health. Retrieved 2013-10-14. 

External links

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