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{{Short description|Irreversible non-selective MAO inhibitor Antidepressant drug}}
{{cs1 config|name-list-style=vanc|display-authors=6}}
{{Infobox drug
{{Infobox drug
| Verifiedfields = changed
| Verifiedfields = changed
| Watchedfields = changed
| Watchedfields = changed
| verifiedrevid = 402690453
| verifiedrevid = 402690453
| drug_name =
| type =
| IUPAC_name = (±)-''trans''-2-phenylcyclopropan-1-amine<br />or<br />''rel''-(1''R'',2''S'')-2-phenylcyclopropan-1-amine
| image = Tranylcypromine.svg
| image = Tranylcypromine.svg
| width = 175
| width = 175
| alt =
| alt =
| caption = (1''S'',2''R'')-(−)-tranylcypromine (top),<br />(1''R'',2''S'')-(+)-tranylcypromine (bottom)
| caption = (1''S'',2''R'')-(−)-tranylcypromine (top),<br />(1''R'',2''S'')-(+)-tranylcypromine (bottom)
| chirality = [[Racemic mixture]]


<!--Clinical data-->| tradename = Parnate, many generics<ref name=generics/>
<!--Clinical data-->
| tradename = Parnate, many generics<ref name=generics/>
| synonyms = tran</u>s''-2-phen<u>ylcy</u>clo<u>pro</u>pyla<u>mine
| Drugs.com = {{drugs.com|monograph|tranylcypromine-sulfate}}
| Drugs.com = {{drugs.com|monograph|tranylcypromine-sulfate}}
| MedlinePlus = a682088
| MedlinePlus = a682088
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| pregnancy_category =
| pregnancy_category =
| legal_AU = S4
| legal_AU = S4
| legal_BR = C1
| legal_BR_comment = <ref>{{Cite web |author=Anvisa |author-link=Brazilian Health Regulatory Agency |date=2023-03-31 |title=RDC Nº 784 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial |trans-title=Collegiate Board Resolution No. 784 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control|url=https://www.in.gov.br/en/web/dou/-/resolucao-rdc-n-784-de-31-de-marco-de-2023-474904992 |url-status=live |archive-url=https://web.archive.org/web/20230803143925/https://www.in.gov.br/en/web/dou/-/resolucao-rdc-n-784-de-31-de-marco-de-2023-474904992 |archive-date=2023-08-03 |access-date=2023-08-16 |publisher=[[Diário Oficial da União]] |language=pt-BR |publication-date=2023-04-04}}</ref>
| legal_CA = Rx-only
| legal_CA = Rx-only
| legal_UK = POM
| legal_UK = POM
| legal_US = Rx-only
| legal_US = Rx-only
| legal_status = Rx-only
| legal_status = Rx-only
| routes_of_administration = [[Mouth|Oral]]
| routes_of_administration = [[Oral administration|Oral]]


<!--Pharmacokinetic data-->
<!--Pharmacokinetic data-->| bioavailability = 50%<ref name="Foye's">{{cite book | last = Williams | first = David A. | name-list-style = vanc | chapter = Antidepressants | chapter-url = https://books.google.com/books?id=R0W1ErpsQpkC&pg=PA590 |editor1=Foye, William O. |editor2=Lemke, Thomas L. |editor3=Williams, David A. | title = Foye's Principles of Medicinal Chemistry | publisher = Lippincott Williams & Wilkins | location = Hagerstwon, USA | year = 2007 | pages = 590–1 | isbn = 978-0-7817-6879-5}}</ref>
| bioavailability = 50%<ref name="Foye's">{{cite book | vauthors = Williams DA | chapter = Antidepressants | chapter-url = https://books.google.com/books?id=R0W1ErpsQpkC&pg=PA590 | veditors = Foye WO, Lemke TL, Williams DA | title = Foye's Principles of Medicinal Chemistry | publisher = Lippincott Williams & Wilkins | location = Hagerstwon, USA | year = 2007 | pages = 590–1 | isbn = 978-0-7817-6879-5}}</ref>
| metabolism = Liver<ref>{{Cite web|url=https://www.drugbank.ca/drugs/DB00752|title=Tranylcypromine|website=www.drugbank.ca|access-date=2019-12-06}}</ref><ref>{{cite journal | vauthors = Baker GB, Urichuk LJ, McKenna KF, Kennedy SH | title = Metabolism of monoamine oxidase inhibitors | journal = Cellular and Molecular Neurobiology | volume = 19 | issue = 3 | pages = 411–26 | date = June 1999 | pmid = 10319194 | doi = 10.1023/a:1006901900106 | s2cid = 21380176 }}</ref>
| metabolism = Liver<ref>{{Cite web|url=https://www.drugbank.ca/drugs/DB00752|title=Tranylcypromine|website=www.drugbank.ca|access-date=2019-12-06}}</ref><ref>{{cite journal | vauthors = Baker GB, Urichuk LJ, McKenna KF, Kennedy SH | title = Metabolism of monoamine oxidase inhibitors | journal = Cellular and Molecular Neurobiology | volume = 19 | issue = 3 | pages = 411–26 | date = June 1999 | pmid = 10319194 | doi = 10.1023/a:1006901900106 | s2cid = 21380176 }}</ref>
| elimination_half-life = 2.5 hours<ref name="Foye's"/>
| elimination_half-life = 2.5 hours<ref name="Foye's"/>
| excretion = [[Urine]], [[Feces]]<ref name="Foye's"/>
| excretion = [[Urine]], [[Feces]]<ref name="Foye's"/>


<!--Identifiers-->| CAS_number_Ref = {{cascite|correct|??}}
<!--Identifiers-->
| CAS_number_Ref = {{cascite|correct|??}}
| CAS_number = 155-09-9
| CAS_number = 155-09-9
| ATC_prefix = N06
| ATC_prefix = N06
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| KEGG_Ref = {{keggcite|changed|kegg}}
| KEGG_Ref = {{keggcite|changed|kegg}}
| KEGG = D08625
| KEGG = D08625
| synonyms = ''trans''-2-Phen<u>ylcy</u>clo<u>pro</u>pyla<u>mine</u>


<!--Chemical data-->| C = 9
<!--Chemical data-->
| IUPAC_name = (±)-''trans''-2-phenylcyclopropan-1-amine<br />or<br />''rel''-(1''R'',2''S'')-2-phenylcyclopropan-1-amine
| H = 11
| N = 1
| C=9 | H=11 | N=1
| smiles = c1cccc(c1)[C@@H]2C[C@H]2N
| SMILES = c1cccc(c1)[C@@H]2C[C@H]2N
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C9H11N/c10-9-6-8(9)7-4-2-1-3-5-7/h1-5,8-9H,6,10H2/t8-,9+/m0/s1
| StdInChI = 1S/C9H11N/c10-9-6-8(9)7-4-2-1-3-5-7/h1-5,8-9H,6,10H2/t8-,9+/m0/s1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = AELCINSCMGFISI-DTWKUNHWSA-N
| StdInChIKey = AELCINSCMGFISI-DTWKUNHWSA-N
| chirality = [[Racemic mixture]]
}}
}}


'''Tranylcypromine''' (sold under the trade name '''Parnate''' among others)<ref name=generics>Drugs.com [https://www.drugs.com/international/tranylcypromine.html International brands for Tranylcypromine]. Page accessed April 17, 2016</ref> is a [[monoamine oxidase inhibitor]] (MAOI); more specifically, tranylcypromine acts as [[binding selectivity|nonselective]] and [[irreversible inhibition|irreversible]] [[enzyme inhibitor|inhibitor]] of the [[enzyme]] [[monoamine oxidase]] (MAO).<ref name="Foye's"/><ref name=G&G>{{cite book | last = Baldessarini | first = Ross J. |chapter=17. Drug therapy of depression and anxiety disorders |title=Goodman & Gilman's The Pharmacological Basis of Therapeutics | veditors = Brunton LL, Lazo JS, Parker KL |year=2005 |isbn=978-0-07-142280-2 |location=New York |publisher=McGraw-Hill}}</ref> It is used as an [[antidepressant]] and [[anxiolytic]] agent in the [[clinic]]al [[therapy|treatment]] of [[mood disorder|mood]] and [[anxiety disorder]]s, respectively.
'''Tranylcypromine''', sold under the brand name '''Parnate''' among others,<ref name=generics>{{cite web | work = Drugs.com | url = https://www.drugs.com/international/tranylcypromine.html | title = International brands for Tranylcypromine | access-date = 17 April 2016 }}</ref> is a [[monoamine oxidase inhibitor]] (MAOI).<ref name="Foye's" /><ref name="G&G" /> More specifically, tranylcypromine acts as [[binding selectivity|nonselective]] and [[irreversible inhibition|irreversible]] [[enzyme inhibitor|inhibitor]] of the [[enzyme]] [[monoamine oxidase]] (MAO).<ref name="Foye's"/><ref name=G&G>{{cite book | vauthors = Baldessarini RJ |chapter=17. Drug therapy of depression and anxiety disorders |title=Goodman & Gilman's The Pharmacological Basis of Therapeutics | veditors = Brunton LL, Lazo JS, Parker KL |year=2005 |isbn=978-0-07-142280-2 |location=New York |publisher=McGraw-Hill}}</ref> It is used as an [[antidepressant]] and [[anxiolytic]] agent in the [[clinic]]al [[therapy|treatment]] of [[mood disorder|mood]] and [[anxiety disorder]]s, respectively. It is also effective in the treatment of [[attention-deficit/hyperactivity disorder | ADHD]].<ref>Zametkin A, Rapoport JL, Murphy DL, Linnoila M, Ismond D. Treatment of hyperactive children with monoamine oxidase inhibitors. I. Clinical efficacy. Arch Gen Psychiatry. 1985 Oct;42(10):962-6. doi: 10.1001/archpsyc.1985.01790330042005. PMID: 3899047.</ref><ref>Levin GM. Attention-deficit hyperactivity disorder: the pharmacist's role. Am Pharm. 1995 Nov;NS35(11):10-20. PMID: 8533716.</ref>


Tranylcypromine is a [[propylamine]] formed from the [[cyclization]] of [[amphetamine]]'s [[side chain]];<!--see the DrugBank or PubChem compound summary for tranylcypromine--> therefore, it is classified as a [[substituted amphetamine]].
Tranylcypromine is also known as ''trans''-2-phenylcyclopropyl-1-amine and is formed ''pro forma'' from the [[cyclization]] of [[amphetamine]]'s [[isopropylamine]] [[side chain]]. As a result, it is classified [[chemical structure|structurally]] as a [[substituted phenethylamine]] and [[substituted amphetamine|amphetamine]].


==Medical uses==
==Medical uses==
Tranylcypromine is used to treat [[major depressive disorder]], including [[atypical depression]], especially when there is an [[anxiety disorder|anxiety component]], typically as a second-line treatment.<ref name=EMC>UK Electronic medicines compendium. [https://www.medicines.org.uk/emc/medicine/25577 Tranylcypromine] Llast updated October 28, 2015</ref> It is also used in depression that is not responsive to [[reuptake inhibitor]] antidepressants, such as the [[Selective serotonin reuptake inhibitor|SSRIs]], [[Tricyclic antidepressant|TCAs]], or [[bupropion]].<ref name="pmid22110357"/>
Tranylcypromine is used to treat [[major depressive disorder]], including [[atypical depression]], especially when there is an [[anxiety disorder|anxiety component]], typically as a second-line treatment.<ref name=EMC>{{cite web | work = UK Electronic medicines compendium. | url = https://www.medicines.org.uk/emc/medicine/25577 | title = Tranylcypromine | access-date = 28 October 2015 }}</ref> It is also used in depression that is not responsive to [[reuptake inhibitor]] antidepressants, such as the [[Selective serotonin reuptake inhibitor|SSRIs]], [[Tricyclic antidepressant|TCAs]], or [[bupropion]].<ref name="pmid22110357"/> In addition to being a recognized treatment for major depressive disorder, tranylcypromine has been demonstrated to be effective in treating
[[obsessive compulsive disorder]]<ref>{{cite journal | vauthors = Jenike MA | title = Rapid response of severe obsessive-compulsive disorder to tranylcypromine | journal = The American Journal of Psychiatry | volume = 138 | issue = 9 | pages = 1249–1250 | date = September 1981 | pmid = 7270737 | doi = 10.1176/ajp.138.9.1249 }}</ref><ref>{{cite web | vauthors = Marques C, Nardi AE, Mendlowicz M, Figueira I, Andrade Y, Camisão C, Coscarelli P, Versiani M | title = A tranilcipromina no tratamento do transtorno obsessivoðcompulsivo: relato de seis casos. | trans-title = The tranylcypromine in the treatment of obsessive-compulsive disorder: Report of six cases | language = pt-BR | journal = Jornal Brasileiro de Psiquiatria | date = 1994 | pages = 400-403 | url = https://www.researchgate.net/publication/294754327 }}</ref><ref>{{cite journal | vauthors = Joffe RT, Swinson RP | title=Tranylcypromine in primary obsessive-compulsive disorder | journal=Journal of Anxiety Disorders | volume=4 | issue=4 | date=1990 | doi=10.1016/0887-6185(90)90033-6 | pages=365–367 |url=https://psycnet.apa.org/record/1991-13396-001}}</ref> and [[panic disorder]].<ref>{{cite journal | vauthors = Nardi AE, Lopes FL, Valença AM, Freire RC, Nascimento I, Veras AB, Mezzasalma MA, de-Melo-Neto VL, Soares-Filho GL, King AL, Grivet LO, Rassi A, Versiani M | title = Double-blind comparison of 30 and 60 mg tranylcypromine daily in patients with panic disorder comorbid with social anxiety disorder | journal = Psychiatry Research | volume = 175 | issue = 3 | pages = 260–265 | date = February 2010 | pmid = 20036427 | doi = 10.1016/j.psychres.2008.06.025 | s2cid = 45566164 }}</ref><ref>{{cite journal | vauthors = Saeed SA, Bruce TJ | title = Panic disorder: effective treatment options | journal = American Family Physician | volume = 57 | issue = 10 | pages = 2405–2412 | date = May 1998 | pmid = 9614411 | url = https://www.aafp.org/pubs/afp/issues/1998/0515/p2405.html }}</ref>

[[Systematic review]]s and [[meta-analysis|meta-analyses]] have reported that tranylcypromine is significantly more effective in the treatment of depression than [[placebo]] and has efficacy over placebo similar to that of other antidepressants such as [[tricyclic antidepressant]]s.<ref name="pmid28579071">{{cite journal | vauthors = Ricken R, Ulrich S, Schlattmann P, Adli M | title = Tranylcypromine in mind (Part II): Review of clinical pharmacology and meta-analysis of controlled studies in depression | journal = Eur Neuropsychopharmacol | volume = 27 | issue = 8 | pages = 714–731 | date = August 2017 | pmid = 28579071 | doi = 10.1016/j.euroneuro.2017.04.003 | s2cid = 30987747 | url = | doi-access = free }}</ref><ref name="pmid31834088">{{cite journal | vauthors = Ulrich S, Ricken R, Buspavanich P, Schlattmann P, Adli M | title = Efficacy and Adverse Effects of Tranylcypromine and Tricyclic Antidepressants in the Treatment of Depression: A Systematic Review and Comprehensive Meta-analysis | journal = J Clin Psychopharmacol | volume = 40 | issue = 1 | pages = 63–74 | date = 2020 | pmid = 31834088 | doi = 10.1097/JCP.0000000000001153 | s2cid = 209343653 | url = }}</ref>


==Contraindications==
==Contraindications==
Contraindications include:<ref name=EMC/><ref name="pmid22110357"/><ref name="pmid21192146">{{cite journal | vauthors = Gillman PK | title = Advances pertaining to the pharmacology and interactions of irreversible nonselective monoamine oxidase inhibitors | journal = Journal of Clinical Psychopharmacology | volume = 31 | issue = 1 | pages = 66–74 | date = February 2011 | pmid = 21192146 | doi = 10.1097/JCP.0b013e31820469ea | s2cid = 10525989 }}</ref>
Contraindications include:<ref name=EMC/><ref name="pmid22110357"/><ref name="pmid21192146">{{cite journal | vauthors = Gillman PK | title = Advances pertaining to the pharmacology and interactions of irreversible nonselective monoamine oxidase inhibitors | journal = Journal of Clinical Psychopharmacology | volume = 31 | issue = 1 | pages = 66–74 | date = February 2011 | pmid = 21192146 | doi = 10.1097/JCP.0b013e31820469ea | s2cid = 10525989 }}</ref>

* [[Porphyria]]
* [[Porphyria]]
* [[Cardiovascular disease|Cardiovascular]] or [[cerebrovascular disease]]
* [[Cardiovascular disease|Cardiovascular]] or [[cerebrovascular disease]]
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{{Main|Foods containing tyramine}}
{{Main|Foods containing tyramine}}


[[Tyramine]] is a biogenic amine produced as a (generally undesirable) byproduct during the fermentation of certain tyrosine-rich foods. It is rapidly metabolized by [[Monoamine oxidase A|MAO-A]] in those not taking MAO-inhibiting drugs. Individuals sensitive to tyramine-induced hypertension may experience an uncomfortable, yet fleeting, increase in blood pressure after ingesting relatively small amounts of tyramine. <ref name="pmid28655495"/><ref name="pmid21192146"/><ref name = "Kim_2014">{{cite journal | doi=10.1016/j.lwt.2013.11.001 | title=Tyramine production among lactic acid bacteria and other species isolated from kimchi | year=2014 | vauthors = Kim MJ, Kim KS | journal=LWT - Food Science and Technology | volume=56 | issue=2 | pages=406–413 | doi-access=free }}</ref>
[[Tyramine]] is a common component in many foods, and is normally rapidly metabolized by [[Monoamine oxidase A|MAO-A]]. Individuals not taking MAOIs may consume at least 2 grams of tyramine in a meal and not experience an increase in blood pressure, whereas those taking MAOIs such as tranylcypromine may experience a sharp increase in blood pressure following consumption of as little as 10&nbsp;mg of tyramine, which can lead to hypertensive crisis.<ref name="PMID28655495"/><ref name="pmid21192146"/>


Advances in food safety standards in most nations, as well as the widespread use of starter-cultures shown to result in undetectable to low levels of tyramine in fermented products has rendered concerns of serious hypertensive crises rare in those consuming a modern diet.<ref>{{cite journal | vauthors = Gillman PK | title = Monoamine oxidase inhibitors: a review concerning dietary tyramine and drug interactions. | journal = PsychoTropical Commentaries | date = 2016 | volume = 1 | pages = 1–90 | url = https://www.psychotropical.com/wp-content/uploads/4.20-MAOI_diet_long.pdf }}</ref><ref name = "Kim_2014" /> Those treated with MAOIs should still exercise caution, particularly at home, if it is unclear whether food has been properly refrigerated. Since tyramine-producing microbes also produce compounds to which humans have a natural aversion, disposal of any questionable food—particularly meats—should be sufficient to avoid hypertensive crises.
Foods containing tyramine include [[aged cheese]]s, [[cured meat]]s, [[tofu]] and certain [[red wine]]s. Some, such as [[yeast extract]]s, contain enough tyramine to be potentially fatal in a single serving. [[Spoiled food]] is also likely to contain dangerous levels of tyramine.<ref name=EMC/>


==Adverse effects==
==Adverse effects==
'''<big>Incidence of adverse effects</big>'''<ref name="pmid28579071" />
'''<big>Incidence of adverse effects</big>'''<ref name="pmid28579071">{{cite journal | vauthors = Ricken R, Ulrich S, Schlattmann P, Adli M | title = Tranylcypromine in mind (Part II): Review of clinical pharmacology and meta-analysis of controlled studies in depression | journal = European Neuropsychopharmacology | volume = 27 | issue = 8 | pages = 714–731 | date = August 2017 | pmid = 28579071 | doi = 10.1016/j.euroneuro.2017.04.003 | s2cid = 30987747 | doi-access = free }}</ref>


'''Very common (>10% incidence) adverse effects include:'''
'''Very common (>10% incidence) adverse effects include:'''
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'''Common (1-10% incidence) adverse effects include:'''
'''Common (1-10% incidence) adverse effects include:'''
* [[Tachycardia]] (5-10%)
* [[Tachycardia]] (5–10%)
* [[Hypomania]] (7%)
* [[Hypomania]] (7%)
* [[Paresthesia]] (5%)
* [[Paresthesia]] (5%)
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Tranylcypromine is not associated with [[weight gain]] and has a low risk for hepatotoxicity compared to the [[hydrazine (Antidepressant)|hydrazine]] MAOIs.<ref name="pmid28579071"/><ref name="pmid22110357"/>
Tranylcypromine is not associated with [[weight gain]] and has a low risk for hepatotoxicity compared to the [[hydrazine (Antidepressant)|hydrazine]] MAOIs.<ref name="pmid28579071"/><ref name="pmid22110357"/>


It is generally recommended that MAOIs be discontinued prior to [[anesthesia]]; however, this creates a risk of recurrent depression. In a retrospective observational cohort study, patients on tranylcypromine undergoing general anesthesia had a lower incidence of intraoperative hypotension, while there was no difference between patients not taking an MAOI regarding intraoperative incidence of [[bradycardia]], tachycardia, or hypertension.<ref>{{cite journal | vauthors = van Haelst IM, van Klei WA, Doodeman HJ, Kalkman CJ, Egberts TC | title = Antidepressive treatment with monoamine oxidase inhibitors and the occurrence of intraoperative hemodynamic events: a retrospective observational cohort study | journal = The Journal of Clinical Psychiatry | volume = 73 | issue = 8 | pages = 1103–9 | date = August 2012 | pmid = 22938842 | doi = 10.4088/JCP.11m07607 }}</ref> The use of indirect [[sympathomimetic drug]]s or drugs affecting serotonin reuptake, such as [[meperidine]] or [[dextromethorphan]] poses a risk for [[hypertension]] and [[serotonin syndrome]] respectively; alternative agents are recommended.<ref>{{cite journal | vauthors = Smith MS, Muir H, Hall R | title = Perioperative management of drug therapy, clinical considerations | journal = Drugs | volume = 51 | issue = 2 | pages = 238–59 | date = February 1996 | pmid = 8808166 | doi = 10.2165/00003495-199651020-00005 | s2cid = 46972638 }}</ref><ref>{{cite journal | vauthors = Blom-Peters L, Lamy M | title = Monoamine oxidase inhibitors and anesthesia: an updated literature review | journal = Acta Anaesthesiologica Belgica | volume = 44 | issue = 2 | pages = 57–60 | date = 1993 | pmid = 8237297 }}</ref> Other studies have come to similar conclusions.<ref name="pmid28579071"/> Pharmacokinetic interactions with anesthetics are unlikely, given that tranylcypromine is a high-affinity substrate for [[CYP2A6]] and does not inhibit CYP enzymes at therapeutic concentrations.<ref name="PMID28655495"/>
It is generally recommended that MAOIs be discontinued prior to [[anesthesia]]; however, this creates a risk of recurrent depression. In a retrospective observational cohort study, patients on tranylcypromine undergoing general anesthesia had a lower incidence of intraoperative hypotension, while there was no difference between patients not taking an MAOI regarding intraoperative incidence of [[bradycardia]], tachycardia, or hypertension.<ref>{{cite journal | vauthors = van Haelst IM, van Klei WA, Doodeman HJ, Kalkman CJ, Egberts TC | title = Antidepressive treatment with monoamine oxidase inhibitors and the occurrence of intraoperative hemodynamic events: a retrospective observational cohort study | journal = The Journal of Clinical Psychiatry | volume = 73 | issue = 8 | pages = 1103–9 | date = August 2012 | pmid = 22938842 | doi = 10.4088/JCP.11m07607 }}</ref> The use of indirect [[sympathomimetic drug]]s or drugs affecting serotonin reuptake, such as [[meperidine]] or [[dextromethorphan]] poses a risk for [[hypertension]] and [[serotonin syndrome]] respectively; alternative agents are recommended.<ref>{{cite journal | vauthors = Smith MS, Muir H, Hall R | title = Perioperative management of drug therapy, clinical considerations | journal = Drugs | volume = 51 | issue = 2 | pages = 238–59 | date = February 1996 | pmid = 8808166 | doi = 10.2165/00003495-199651020-00005 | s2cid = 46972638 }}</ref><ref>{{cite journal | vauthors = Blom-Peters L, Lamy M | title = Monoamine oxidase inhibitors and anesthesia: an updated literature review | journal = Acta Anaesthesiologica Belgica | volume = 44 | issue = 2 | pages = 57–60 | date = 1993 | pmid = 8237297 }}</ref> Other studies have come to similar conclusions.<ref name="pmid28579071"/> Pharmacokinetic interactions with anesthetics are unlikely, given that tranylcypromine is a high-affinity substrate for [[CYP2A6]] and does not inhibit CYP enzymes at therapeutic concentrations.<ref name="pmid28655495"/>


Tranylcypromine [[substance abuse|abuse]] has been reported at doses ranging from 120–600&nbsp;mg per day.<ref name=EMC/><ref>{{cite journal| vauthors = Le Gassicke J, Ashcroft GW, Eccleston D, Evans JI, Oswald I, Ritson EB |title=The Clinical State, Sleep and Amine Metabolism of a Tranylcypromine ('Parnate') Addict|journal=The British Journal of Psychiatry|date=1 April 1965|volume=111|issue=473|pages=357–364|doi=10.1192/bjp.111.473.357}}</ref><ref name="pmid28579071"/> It is thought that higher doses have more [[amphetamine]]-like effects and abuse is promoted by the fast onset and short half-life of tranylcypromine.<ref name="pmid28579071"/>
Tranylcypromine [[substance abuse|abuse]] has been reported at doses ranging from 120 to 600&nbsp;mg per day.<ref name=EMC/><ref>{{cite journal| vauthors = Le Gassicke J, Ashcroft GW, Eccleston D, Evans JI, Oswald I, Ritson EB |title=The Clinical State, Sleep and Amine Metabolism of a Tranylcypromine ('Parnate') Addict|journal=The British Journal of Psychiatry|date=1 April 1965|volume=111|issue=473|pages=357–364|doi=10.1192/bjp.111.473.357|s2cid=145562899 }}</ref><ref name="pmid28579071"/> It is thought that higher doses have more [[amphetamine]]-like effects and abuse is promoted by the fast onset and short half-life of tranylcypromine.<ref name="pmid28579071"/>


Cases of suicidal ideation and suicidal behaviours have been reported during tranylcypromine therapy or early after treatment discontinuation.<ref name=EMC/>
Cases of suicidal ideation and suicidal behaviours have been reported during tranylcypromine therapy or early after treatment discontinuation.<ref name=EMC/>
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Symptoms of tranylcypromine overdose are generally more intense manifestations of its usual effects.<ref name=EMC/>
Symptoms of tranylcypromine overdose are generally more intense manifestations of its usual effects.<ref name=EMC/>


== Interactions ==
==Interactions==

In addition to contraindicated concomitant medications, tranylcypromine inhibits [[CYP2A6]], which may reduce the metabolism and increase the toxicity of substrates of this enzyme, such as:<ref name="pmid21192146"/>
In addition to contraindicated concomitant medications, tranylcypromine inhibits [[CYP2A6]], which may reduce the metabolism and increase the toxicity of substrates of this enzyme, such as:<ref name="pmid21192146"/>


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==Pharmacology==
==Pharmacology==

===Pharmacodynamics===
===Pharmacodynamics===
Tranylcypromine acts as a nonselective and irreversible inhibitor of monoamine oxidase.<ref name="Foye's"/> Regarding the [[isoform]]s of monoamine oxidase, it shows slight preference for the [[MAO-B|MAOB]] [[isoenzyme]] over [[MAO-A|MAOA]].<ref name="PMID28655495"/> This leads to an increase in the availability of [[Monoamine neurotransmitter|monoamines]], such as [[serotonin]], [[norepinephrine]], and [[dopamine]], as well as a marked increase in the availability of [[trace amine]]s, such as [[tryptamine]], [[Octopamine (drug)|octopamine]], and [[phenethylamine]].<ref name="PMID28655495"/><ref name="pmid21192146"/> The clinical relevance of increased trace amine availability is unclear.
Tranylcypromine acts as a nonselective and irreversible inhibitor of monoamine oxidase.<ref name="Foye's"/> Regarding the [[isoform]]s of monoamine oxidase, it shows slight preference for the [[MAO-B|MAOB]] [[isoenzyme]] over [[MAO-A|MAOA]].<ref name="pmid28655495"/> This leads to an increase in the availability of [[Monoamine neurotransmitter|monoamines]], such as [[serotonin]], [[norepinephrine]], and [[dopamine]], [[epinephrine]] as well as a marked increase in the availability of [[trace amine]]s, such as [[tryptamine]], [[Octopamine (drug)|octopamine]], and [[phenethylamine]].<ref name="pmid28655495"/><ref name="pmid21192146"/> The clinical relevance of increased trace amine availability is unclear.


It may also act as a [[norepinephrine reuptake inhibitor]] at higher therapeutic doses.<ref name="PMID28655495"/> Compared to [[amphetamine]], tranylcypromine shows low potency as a [[dopamine]] [[releasing agent]], with even weaker potency for [[norepinephrine]] and [[serotonin]] release.<ref name="PMID28655495"/><ref name="pmid21192146"/>
It may also act as a [[norepinephrine reuptake inhibitor]] at higher therapeutic doses.<ref name="pmid28655495"/> Compared to [[amphetamine]], tranylcypromine shows low potency as a [[dopamine]] [[releasing agent]], with even weaker potency for [[norepinephrine]] and [[serotonin]] release.<ref name="pmid28655495"/><ref name="pmid21192146"/>


Tranylcypromine has also been shown to inhibit the [[histone]] demethylase, BHC110/[[LSD1]]. Tranylcypromine inhibits this enzyme with an IC50 < 2 μM, thus acting as a small molecule inhibitor of histone demethylation with an effect to derepress the transcriptional activity of BHC110/LSD1 target genes.<ref name="pmid16793513">{{cite journal | vauthors = Lee MG, Wynder C, Schmidt DM, McCafferty DG, Shiekhattar R | title = Histone H3 lysine 4 demethylation is a target of nonselective antidepressive medications | journal = Chemistry & Biology | volume = 13 | issue = 6 | pages = 563–7 | date = June 2006 | pmid = 16793513 | doi = 10.1016/j.chembiol.2006.05.004 | doi-access = free }}</ref> The clinical relevance of this effect is unknown.
Tranylcypromine has also been shown to inhibit the [[histone]] demethylase, BHC110/[[LSD1]]. Tranylcypromine inhibits this enzyme with an IC50 < 2 μM, thus acting as a small molecule inhibitor of histone demethylation with an effect to derepress the transcriptional activity of BHC110/LSD1 target genes.<ref name="pmid16793513">{{cite journal | vauthors = Lee MG, Wynder C, Schmidt DM, McCafferty DG, Shiekhattar R | title = Histone H3 lysine 4 demethylation is a target of nonselective antidepressive medications | journal = Chemistry & Biology | volume = 13 | issue = 6 | pages = 563–7 | date = June 2006 | pmid = 16793513 | doi = 10.1016/j.chembiol.2006.05.004 | doi-access = }}</ref> The clinical relevance of this effect is unknown.


Tranylcypromine has been found to inhibit [[CYP46A1]] at nanomolar concentrations.<ref>{{cite journal | vauthors = Mast N, Charvet C, Pikuleva IA, Stout CD | title = Structural basis of drug binding to CYP46A1, an enzyme that controls cholesterol turnover in the brain | journal = The Journal of Biological Chemistry | volume = 285 | issue = 41 | pages = 31783–95 | date = October 2010 | pmid = 20667828 | pmc = 2951250 | doi = 10.1074/jbc.M110.143313 }}</ref> The clinical relevance of this effect is unknown.
Tranylcypromine has been found to inhibit [[CYP46A1]] at nanomolar concentrations.<ref>{{cite journal | vauthors = Mast N, Charvet C, Pikuleva IA, Stout CD | title = Structural basis of drug binding to CYP46A1, an enzyme that controls cholesterol turnover in the brain | journal = The Journal of Biological Chemistry | volume = 285 | issue = 41 | pages = 31783–95 | date = October 2010 | pmid = 20667828 | pmc = 2951250 | doi = 10.1074/jbc.M110.143313 | doi-access = free }}</ref> The clinical relevance of this effect is unknown.


[[File:Tranylcypromine-MAO-inhibiton.png|thumb|none|600px|Mechanism of tranylcypromine inhibition of MAO.<ref name="pmid22022344">{{cite journal | vauthors = Gaweska H, Fitzpatrick PF | title = Structures and Mechanism of the Monoamine Oxidase Family | journal = Biomolecular Concepts | volume = 2 | issue = 5 | pages = 365–377 | date = October 2011 | pmid = 22022344 | pmc = 3197729 | doi = 10.1515/BMC.2011.030 }}</ref>]]
[[File:Tranylcypromine-MAO-inhibiton.png|thumb|none|600px|Mechanism of tranylcypromine inhibition of MAO.<ref name="pmid22022344">{{cite journal | vauthors = Gaweska H, Fitzpatrick PF | title = Structures and Mechanism of the Monoamine Oxidase Family | journal = Biomolecular Concepts | volume = 2 | issue = 5 | pages = 365–377 | date = October 2011 | pmid = 22022344 | pmc = 3197729 | doi = 10.1515/BMC.2011.030 }}</ref>]]


===Pharmacokinetics===
===Pharmacokinetics===
Tranylcypromine reaches its maximum concentration (t<sub>max</sub>) within 1–2 hours.<ref name="PMID28655495">{{cite journal | vauthors = Ulrich S, Ricken R, Adli M | title = Tranylcypromine in mind (Part I): Review of pharmacology | journal = European Neuropsychopharmacology | volume = 27 | issue = 8 | pages = 697–713 | date = August 2017 | pmid = 28655495 | doi = 10.1016/j.euroneuro.2017.05.007 | s2cid = 4913721 | doi-access = free }}</ref> After a 20&nbsp;mg dose, plasma concentrations reach at most 50-200&nbsp;ng/mL.<ref name="PMID28655495"/> While its [[Biological half-life|half-life]] is only about 2 hours, its pharmacodynamic effects last several days to weeks due to irreversible inhibition of MAO.<ref name="PMID28655495"/>
Tranylcypromine reaches its maximum concentration (t<sub>max</sub>) within 1–2 hours.<ref name="pmid28655495">{{cite journal | vauthors = Ulrich S, Ricken R, Adli M | title = Tranylcypromine in mind (Part I): Review of pharmacology | journal = European Neuropsychopharmacology | volume = 27 | issue = 8 | pages = 697–713 | date = August 2017 | pmid = 28655495 | doi = 10.1016/j.euroneuro.2017.05.007 | s2cid = 4913721 | doi-access = free }}</ref> After a 20&nbsp;mg dose, plasma concentrations reach at most 50-200&nbsp;ng/mL.<ref name="pmid28655495"/> While its [[Biological half-life|half-life]] is only about 2 hours, its pharmacodynamic effects last several days to weeks due to irreversible inhibition of MAO.<ref name="pmid28655495"/>


Metabolites of tranylcypromine include 4-hydroxytranylcypromine, ''N''-acetyltranylcypromine, and ''N''-acetyl-4-hydroxytranylcypromine, which are less potent MAO inhibitors than tranylcypromine itself.<ref name="PMID28655495"/> [[Amphetamine]] was once thought to be a metabolite of tranylcypromine, but has not been shown to be.<ref name="PMID28655495"/><ref>{{cite journal | vauthors = Sherry RL, Rauw G, McKenna KF, Paetsch PR, Coutts RT, Baker GB | title = Failure to detect amphetamine or 1-amino-3-phenylpropane in humans or rats receiving the MAO inhibitor tranylcypromine | journal = Journal of Affective Disorders | volume = 61 | issue = 1–2 | pages = 23–9 | date = December 2000 | pmid = 11099737 | doi = 10.1016/s0165-0327(99)00188-3 }}</ref><ref name="pmid21192146"/>
Metabolites of tranylcypromine include 4-hydroxytranylcypromine, ''N''-acetyltranylcypromine, and ''N''-acetyl-4-hydroxytranylcypromine, which are less potent MAO inhibitors than tranylcypromine itself.<ref name="pmid28655495"/> [[Amphetamine]] was once thought to be a metabolite of tranylcypromine, but has not been shown to be.<ref name="pmid28655495"/><ref>{{cite journal | vauthors = Sherry RL, Rauw G, McKenna KF, Paetsch PR, Coutts RT, Baker GB | title = Failure to detect amphetamine or 1-amino-3-phenylpropane in humans or rats receiving the MAO inhibitor tranylcypromine | journal = Journal of Affective Disorders | volume = 61 | issue = 1–2 | pages = 23–9 | date = December 2000 | pmid = 11099737 | doi = 10.1016/s0165-0327(99)00188-3 }}</ref><ref name="pmid21192146"/>


Tranylcypromine inhibits [[CYP2A6]] at therapeutic concentrations.<ref name="pmid21192146"/>
Tranylcypromine inhibits [[CYP2A6]] at therapeutic concentrations.<ref name="pmid21192146"/>
Line 166: Line 174:


===Synthesis===
===Synthesis===
[[File:Tranylcypromine-synth.png|thumb|none|1000px|Synthesis of tranylcypromine<ref>{{cite patent|country=US|number=4016204 A|status=patent|title=Method of synthesis of trans-2-phenylcyclopropylamine|pubdate=1977-04-05|fdate=1975-10-31|pridate=1975-10-31|invent1=Vithal Jagannath Rajadhyaksha|assign1=Nelson Research & Development Company|}}</ref>]]
[[File:Tranylcypromine-synth.png|thumb|none|1000px|Synthesis of tranylcypromine<ref>{{cite patent|country=US|number=4016204 A|status=patent|title=Method of synthesis of trans-2-phenylcyclopropylamine |pubdate=1977-04-05 |fdate=1975-10-31 |pridate=1975-10-31 |inventor= Rajadhyaksha VJ |assign1=Nelson Research & Development Company }}</ref>]]


==History==
==History==
Tranylcypromine was originally developed as an [[analog (chemistry)|analog]] of [[amphetamine]].<ref name="Foye's"/><ref name="PMID28655495"/> Although it was first synthesized in 1948,<ref>{{cite journal| vauthors = Burger A, Yost WL |title=Arylcycloalkylamines. I. 2-Phenylcyclopropylamine|journal=Journal of the American Chemical Society|volume=70|issue=6|pages=2198–2201|doi=10.1021/ja01186a062|year=1948}}</ref> its MAOI action was not discovered until 1959. Precisely because tranylcypromine was not, like [[isoniazid]] and [[iproniazid]], a [[hydrazine]] derivative, its clinical interest increased enormously, as it was thought it might have a more acceptable [[therapeutic index]] than previous MAOIs.<ref>{{cite journal | vauthors = López-Muñoz F, Alamo C | title = Monoaminergic neurotransmission: the history of the discovery of antidepressants from 1950s until today | journal = Current Pharmaceutical Design | volume = 15 | issue = 14 | pages = 1563–86 | date = 2009 | pmid = 19442174 | doi = 10.2174/138161209788168001 }}</ref>
Tranylcypromine was originally developed as an [[analog (chemistry)|analog]] of [[amphetamine]].<ref name="Foye's"/><ref name="pmid28655495"/> Although it was first synthesized in 1948,<ref>{{cite journal| vauthors = Burger A, Yost WL |title=Arylcycloalkylamines. I. 2-Phenylcyclopropylamine|journal=Journal of the American Chemical Society|volume=70|issue=6|pages=2198–2201|doi=10.1021/ja01186a062|year=1948}}</ref> its MAOI action was not discovered until 1959. Precisely because tranylcypromine was not, like [[isoniazid]] and [[iproniazid]], a [[hydrazine]] derivative, its clinical interest increased enormously, as it was thought it might have a more acceptable [[therapeutic index]] than previous MAOIs.<ref>{{cite journal | vauthors = López-Muñoz F, Alamo C | title = Monoaminergic neurotransmission: the history of the discovery of antidepressants from 1950s until today | journal = Current Pharmaceutical Design | volume = 15 | issue = 14 | pages = 1563–86 | date = 2009 | pmid = 19442174 | doi = 10.2174/138161209788168001 }}</ref>


The drug was introduced by [[Smith, Kline and French]] in the [[United Kingdom]] in 1960, and approved in the [[United States]] in 1961.<ref name="isbn0-19-536874-6">{{cite book | last = Shorter | first = Edward | name-list-style = vanc | title = Before Prozac: the troubled history of mood disorders in psychiatry | publisher = Oxford University Press | location = Oxford [Oxfordshire] | year = 2009 | isbn = 978-0-19-536874-1 | url = https://books.google.com/books?id=8VaYF8pIPxgC&pg=PR13}}</ref> It was withdrawn from the market in February 1964 due to a number of patient deaths involving hypertensive crises with intracranial bleeding. However, it was reintroduced later that year with more limited indications and specific warnings of the risks.<ref>{{cite journal | vauthors = Atchley DW | title = Reevaluation of Tranylcypromine Sulfate(Parnate Sulfate) | journal = JAMA | volume = 189 | issue = 10 | pages = 763–4 | date = September 1964 | pmid = 14174054 | doi = 10.1001/jama.1964.03070100057011 }}</ref><ref name="PMID28655495"/><ref name="pmid21192146"/>
The drug was introduced by [[Smith, Kline and French]] in the [[United Kingdom]] in 1960, and approved in the [[United States]] in 1961.<ref name="isbn0-19-536874-6">{{cite book | vauthors = Shorter E | title = Before Prozac: the troubled history of mood disorders in psychiatry | publisher = Oxford University Press | location = Oxford [Oxfordshire] | year = 2009 | isbn = 978-0-19-536874-1 | url = https://books.google.com/books?id=8VaYF8pIPxgC&pg=PR13}}</ref> It was withdrawn from the market in February 1964 due to a number of patient deaths involving hypertensive crises with intracranial bleeding. However, it was reintroduced later that year with more limited indications and specific warnings of the risks.<ref>{{cite journal | vauthors = Atchley DW | title = Reevaluation of Tranylcypromine Sulfate(Parnate Sulfate) | journal = JAMA | volume = 189 | issue = 10 | pages = 763–4 | date = September 1964 | pmid = 14174054 | doi = 10.1001/jama.1964.03070100057011 }}</ref><ref name="pmid28655495"/><ref name="pmid21192146"/>


==Research==
==Research==
Tranylcypromine is known to inhibit [[KDM1A|LSD1]], an enzyme that selectively [[Methyl group|demethylates]] two [[lysine]]s found on [[histone H3]].<ref name="pmid16793513"/><ref name="PMID28655495"/><ref name="pmid26881714">{{cite journal | vauthors = Zheng YC, Yu B, Jiang GZ, Feng XJ, He PX, Chu XY, Zhao W, Liu HM | display-authors = 6 | title = Irreversible LSD1 Inhibitors: Application of Tranylcypromine and Its Derivatives in Cancer Treatment | journal = Current Topics in Medicinal Chemistry | volume = 16 | issue = 19 | pages = 2179–88 | date = 2016 | pmid = 26881714 | doi = 10.2174/1568026616666160216154042 }}</ref> Genes promoted downstream of LSD1 are involved in cancer cell growth and metastasis, and several tumor cells express high levels of LSD1.<ref name="pmid26881714"/> Tranylcypromine analogues with more potent and selective LSD1 inhibitory activity are being researched in the potential treatment of cancers.<ref name="pmid26881714"/><ref name="pmid27077938">{{cite journal | vauthors = Przespolewski A, Wang ES | title = Inhibitors of LSD1 as a potential therapy for acute myeloid leukemia | journal = Expert Opinion on Investigational Drugs | volume = 25 | issue = 7 | pages = 771–80 | date = July 2016 | pmid = 27077938 | doi = 10.1080/13543784.2016.1175432 | s2cid = 20858344 }}</ref>
Tranylcypromine is known to inhibit [[KDM1A|LSD1]], an enzyme that selectively [[Methyl group|demethylates]] two [[lysine]]s found on [[histone H3]].<ref name="pmid16793513"/><ref name="pmid28655495"/><ref name="pmid26881714">{{cite journal | vauthors = Zheng YC, Yu B, Jiang GZ, Feng XJ, He PX, Chu XY, Zhao W, Liu HM | title = Irreversible LSD1 Inhibitors: Application of Tranylcypromine and Its Derivatives in Cancer Treatment | journal = Current Topics in Medicinal Chemistry | volume = 16 | issue = 19 | pages = 2179–88 | date = 2016 | pmid = 26881714 | doi = 10.2174/1568026616666160216154042 }}</ref> Genes promoted downstream of LSD1 are involved in cancer cell growth and metastasis, and several tumor cells express high levels of LSD1.<ref name="pmid26881714"/> Tranylcypromine analogues with more potent and selective LSD1 inhibitory activity are being researched in the potential treatment of cancers.<ref name="pmid26881714"/><ref name="pmid27077938">{{cite journal | vauthors = Przespolewski A, Wang ES | title = Inhibitors of LSD1 as a potential therapy for acute myeloid leukemia | journal = Expert Opinion on Investigational Drugs | volume = 25 | issue = 7 | pages = 771–80 | date = July 2016 | pmid = 27077938 | doi = 10.1080/13543784.2016.1175432 | s2cid = 20858344 }}</ref>


Tranylcypromine may have neuroprotective properties applicable to the treatment of [[Parkinson's disease]], similar to the [[Monoamine oxidase B|MAO-B]] inhibitors [[selegiline]] and [[rasagiline]].<ref name="pmid22960850">{{cite journal | vauthors = Al-Nuaimi SK, Mackenzie EM, Baker GB | title = Monoamine oxidase inhibitors and neuroprotection: a review | journal = American Journal of Therapeutics | volume = 19 | issue = 6 | pages = 436–48 | date = November 2012 | pmid = 22960850 | doi = 10.1097/MJT.0b013e31825b9eb5 }}</ref><ref name="pmid22110357">{{cite journal | vauthors = Riederer P, Laux G | title = MAO-inhibitors in Parkinson's Disease | journal = Experimental Neurobiology | volume = 20 | issue = 1 | pages = 1–17 | date = March 2011 | pmid = 22110357 | pmc = 3213739 | doi = 10.5607/en.2011.20.1.1 }}</ref> As of 2017, only one clinical trial in Parkinsonian patients has been conducted, which found some improvement initially and only slight worsening of symptoms after a 1.5 year followup.<ref name="pmid22110357"/>
Tranylcypromine may have neuroprotective properties applicable to the treatment of [[Parkinson's disease]], similar to the [[Monoamine oxidase B|MAO-B]] inhibitors [[selegiline]] and [[rasagiline]].<ref name="pmid22960850">{{cite journal | vauthors = Al-Nuaimi SK, Mackenzie EM, Baker GB | title = Monoamine oxidase inhibitors and neuroprotection: a review | journal = American Journal of Therapeutics | volume = 19 | issue = 6 | pages = 436–48 | date = November 2012 | pmid = 22960850 | doi = 10.1097/MJT.0b013e31825b9eb5 }}</ref><ref name="pmid22110357">{{cite journal | vauthors = Riederer P, Laux G | title = MAO-inhibitors in Parkinson's Disease | journal = Experimental Neurobiology | volume = 20 | issue = 1 | pages = 1–17 | date = March 2011 | pmid = 22110357 | pmc = 3213739 | doi = 10.5607/en.2011.20.1.1 }}</ref> As of 2017, only one clinical trial in Parkinsonian patients has been conducted, which found some improvement initially and only slight worsening of symptoms after a 1.5 year followup.<ref name="pmid22110357"/>


== See also ==
==See also==
* [[Phenelzine]]
* [[Amphetamine]]
* [[Cibenzoline]] (also based on cyclopropane)
* [[Ticagrelor]] (contains 3',4'-difluoro-tranylcypromine [[structural motif]])
* [[Tranylcypromine/trifluoperazine]]
* [[Tranylcypromine/trifluoperazine]]


== References ==
==References==
{{Reflist}}
{{Reflist}}


Line 195: Line 199:


[[Category:Cyclopropanes]]
[[Category:Cyclopropanes]]
[[Category:CYP2D6 inhibitors]]
[[Category:Monoamine oxidase inhibitors]]
[[Category:Monoamine oxidase inhibitors]]
[[Category:Norepinephrine-dopamine releasing agents]]
[[Category:Norepinephrine-dopamine releasing agents]]
[[Category:Substituted amphetamines]]
[[Category:Substituted amphetamines]]
[[Category:Substances discovered in the 1940s]]

Latest revision as of 06:17, 2 September 2024

Tranylcypromine
(1S,2R)-(−)-tranylcypromine (top),
(1R,2S)-(+)-tranylcypromine (bottom)
Clinical data
Trade namesParnate, many generics[1]
Other namestrans-2-Phenylcyclopropylamine
AHFS/Drugs.comMonograph
MedlinePlusa682088
Pregnancy
category
  • AU: B2
Routes of
administration
Oral
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability50%[4]
MetabolismLiver[5][6]
Elimination half-life2.5 hours[4]
ExcretionUrine, Feces[4]
Identifiers
  • (±)-trans-2-phenylcyclopropan-1-amine
    or
    rel-(1R,2S)-2-phenylcyclopropan-1-amine
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
ECHA InfoCard100.005.312 Edit this at Wikidata
Chemical and physical data
FormulaC9H11N
Molar mass133.194 g·mol−1
3D model (JSmol)
ChiralityRacemic mixture
  • c1cccc(c1)[C@@H]2C[C@H]2N
  • InChI=1S/C9H11N/c10-9-6-8(9)7-4-2-1-3-5-7/h1-5,8-9H,6,10H2/t8-,9+/m0/s1 checkY
  • Key:AELCINSCMGFISI-DTWKUNHWSA-N checkY
 ☒NcheckY (what is this?)  (verify)

Tranylcypromine, sold under the brand name Parnate among others,[1] is a monoamine oxidase inhibitor (MAOI).[4][7] More specifically, tranylcypromine acts as nonselective and irreversible inhibitor of the enzyme monoamine oxidase (MAO).[4][7] It is used as an antidepressant and anxiolytic agent in the clinical treatment of mood and anxiety disorders, respectively. It is also effective in the treatment of ADHD.[8][9]

Tranylcypromine is also known as trans-2-phenylcyclopropyl-1-amine and is formed pro forma from the cyclization of amphetamine's isopropylamine side chain. As a result, it is classified structurally as a substituted phenethylamine and amphetamine.

Medical uses

[edit]

Tranylcypromine is used to treat major depressive disorder, including atypical depression, especially when there is an anxiety component, typically as a second-line treatment.[10] It is also used in depression that is not responsive to reuptake inhibitor antidepressants, such as the SSRIs, TCAs, or bupropion.[11] In addition to being a recognized treatment for major depressive disorder, tranylcypromine has been demonstrated to be effective in treating obsessive compulsive disorder[12][13][14] and panic disorder.[15][16]

Systematic reviews and meta-analyses have reported that tranylcypromine is significantly more effective in the treatment of depression than placebo and has efficacy over placebo similar to that of other antidepressants such as tricyclic antidepressants.[17][18]

Contraindications

[edit]

Contraindications include:[10][11][19]

Dietary restrictions

[edit]

Tyramine is a biogenic amine produced as a (generally undesirable) byproduct during the fermentation of certain tyrosine-rich foods. It is rapidly metabolized by MAO-A in those not taking MAO-inhibiting drugs. Individuals sensitive to tyramine-induced hypertension may experience an uncomfortable, yet fleeting, increase in blood pressure after ingesting relatively small amounts of tyramine. [20][19][21]

Advances in food safety standards in most nations, as well as the widespread use of starter-cultures shown to result in undetectable to low levels of tyramine in fermented products has rendered concerns of serious hypertensive crises rare in those consuming a modern diet.[22][21] Those treated with MAOIs should still exercise caution, particularly at home, if it is unclear whether food has been properly refrigerated. Since tyramine-producing microbes also produce compounds to which humans have a natural aversion, disposal of any questionable food—particularly meats—should be sufficient to avoid hypertensive crises.

Adverse effects

[edit]

Incidence of adverse effects[17]

Very common (>10% incidence) adverse effects include:

Common (1-10% incidence) adverse effects include:

Other (unknown incidence) adverse effects include:

Of note, there has not been found to be a correlation between sex and age below 65 regarding incidence of adverse effects.[17]

Tranylcypromine is not associated with weight gain and has a low risk for hepatotoxicity compared to the hydrazine MAOIs.[17][11]

It is generally recommended that MAOIs be discontinued prior to anesthesia; however, this creates a risk of recurrent depression. In a retrospective observational cohort study, patients on tranylcypromine undergoing general anesthesia had a lower incidence of intraoperative hypotension, while there was no difference between patients not taking an MAOI regarding intraoperative incidence of bradycardia, tachycardia, or hypertension.[23] The use of indirect sympathomimetic drugs or drugs affecting serotonin reuptake, such as meperidine or dextromethorphan poses a risk for hypertension and serotonin syndrome respectively; alternative agents are recommended.[24][25] Other studies have come to similar conclusions.[17] Pharmacokinetic interactions with anesthetics are unlikely, given that tranylcypromine is a high-affinity substrate for CYP2A6 and does not inhibit CYP enzymes at therapeutic concentrations.[20]

Tranylcypromine abuse has been reported at doses ranging from 120 to 600 mg per day.[10][26][17] It is thought that higher doses have more amphetamine-like effects and abuse is promoted by the fast onset and short half-life of tranylcypromine.[17]

Cases of suicidal ideation and suicidal behaviours have been reported during tranylcypromine therapy or early after treatment discontinuation.[10]

Symptoms of tranylcypromine overdose are generally more intense manifestations of its usual effects.[10]

Interactions

[edit]

In addition to contraindicated concomitant medications, tranylcypromine inhibits CYP2A6, which may reduce the metabolism and increase the toxicity of substrates of this enzyme, such as:[19]

Norepinephrine reuptake inhibitors prevent neuronal uptake of tyramine and may reduce its pressor effects.[19]

Pharmacology

[edit]

Pharmacodynamics

[edit]

Tranylcypromine acts as a nonselective and irreversible inhibitor of monoamine oxidase.[4] Regarding the isoforms of monoamine oxidase, it shows slight preference for the MAOB isoenzyme over MAOA.[20] This leads to an increase in the availability of monoamines, such as serotonin, norepinephrine, and dopamine, epinephrine as well as a marked increase in the availability of trace amines, such as tryptamine, octopamine, and phenethylamine.[20][19] The clinical relevance of increased trace amine availability is unclear.

It may also act as a norepinephrine reuptake inhibitor at higher therapeutic doses.[20] Compared to amphetamine, tranylcypromine shows low potency as a dopamine releasing agent, with even weaker potency for norepinephrine and serotonin release.[20][19]

Tranylcypromine has also been shown to inhibit the histone demethylase, BHC110/LSD1. Tranylcypromine inhibits this enzyme with an IC50 < 2 μM, thus acting as a small molecule inhibitor of histone demethylation with an effect to derepress the transcriptional activity of BHC110/LSD1 target genes.[27] The clinical relevance of this effect is unknown.

Tranylcypromine has been found to inhibit CYP46A1 at nanomolar concentrations.[28] The clinical relevance of this effect is unknown.

Mechanism of tranylcypromine inhibition of MAO.[29]

Pharmacokinetics

[edit]

Tranylcypromine reaches its maximum concentration (tmax) within 1–2 hours.[20] After a 20 mg dose, plasma concentrations reach at most 50-200 ng/mL.[20] While its half-life is only about 2 hours, its pharmacodynamic effects last several days to weeks due to irreversible inhibition of MAO.[20]

Metabolites of tranylcypromine include 4-hydroxytranylcypromine, N-acetyltranylcypromine, and N-acetyl-4-hydroxytranylcypromine, which are less potent MAO inhibitors than tranylcypromine itself.[20] Amphetamine was once thought to be a metabolite of tranylcypromine, but has not been shown to be.[20][30][19]

Tranylcypromine inhibits CYP2A6 at therapeutic concentrations.[19]

Chemistry

[edit]
Tranylcypromine 10-mg tablet

Synthesis

[edit]
Synthesis of tranylcypromine[31]

History

[edit]

Tranylcypromine was originally developed as an analog of amphetamine.[4][20] Although it was first synthesized in 1948,[32] its MAOI action was not discovered until 1959. Precisely because tranylcypromine was not, like isoniazid and iproniazid, a hydrazine derivative, its clinical interest increased enormously, as it was thought it might have a more acceptable therapeutic index than previous MAOIs.[33]

The drug was introduced by Smith, Kline and French in the United Kingdom in 1960, and approved in the United States in 1961.[34] It was withdrawn from the market in February 1964 due to a number of patient deaths involving hypertensive crises with intracranial bleeding. However, it was reintroduced later that year with more limited indications and specific warnings of the risks.[35][20][19]

Research

[edit]

Tranylcypromine is known to inhibit LSD1, an enzyme that selectively demethylates two lysines found on histone H3.[27][20][36] Genes promoted downstream of LSD1 are involved in cancer cell growth and metastasis, and several tumor cells express high levels of LSD1.[36] Tranylcypromine analogues with more potent and selective LSD1 inhibitory activity are being researched in the potential treatment of cancers.[36][37]

Tranylcypromine may have neuroprotective properties applicable to the treatment of Parkinson's disease, similar to the MAO-B inhibitors selegiline and rasagiline.[38][11] As of 2017, only one clinical trial in Parkinsonian patients has been conducted, which found some improvement initially and only slight worsening of symptoms after a 1.5 year followup.[11]

See also

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References

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