- 5-Hydroxytryptophan
-
Not to be confused with serotonin (5-hydroxytryptamine, 5-HT).
5-Hydroxytryptophan 
2-amino-3- (5-hydroxy-1H-indol-3-yl) propanoic acidIdentifiers CAS number 56-69-9 
PubChem 144 ChemSpider 388413 UNII C1LJO185Q9 KEGG D07339 MeSH 5-Hydroxytryptophan ChEBI CHEBI:17780 ChEMBL CHEMBL350221 Jmol-3D images Image 1 - O=C(O)[C@@H](N)Cc2c1cc(O)ccc1nc2
- InChI=1S/C11H12N2O3/c12-9(11(15)16)3-6-5-13-10-2-1-7(14)4-8(6)10/h1-2,4-5,9,13-14H,3,12H2,(H,15,16)/t9-/m0/s1
Key: LDCYZAJDBXYCGN-VIFPVBQESA-N
InChI=1/C11H12N2O3/c12-9(11(15)16)3-6-5-13-10-2-1-7(14)4-8(6)10/h1-2,4-5,9,13-14H,3,12H2,(H,15,16)/t9-/m0/s1
Key: LDCYZAJDBXYCGN-VIFPVBQEBZ
Properties Molecular formula C11H12N2O3 Molar mass 220.23 g/mol 
(verify) (what is: 
/
?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)Infobox references 5-Hydroxytryptophan (5-HTP), also known as oxitriptan (INN), is a naturally occurring amino acid and chemical precursor as well as metabolic intermediate in the biosynthesis of the neurotransmitters serotonin and melatonin from tryptophan.
5-HTP is sold over-the-counter in the United Kingdom, United States and Canada as a dietary supplement for use as an antidepressant, appetite suppressant, and sleep aid, and is also marketed in many European countries for the indication of major depression under trade names like Cincofarm, Levothym, Levotonine, Oxyfan, Telesol, Tript-OH, and Triptum.[1][2] Several double-blind placebo-controlled clinical trials have demonstrated the effectiveness of 5-HTP in the treatment of depression,[1] though a lack of high quality studies has been noted.[3]
Contents
Metabolism
5-Hydroxytryptophan is decarboxylated to serotonin (5-hydroxytryptamine or 5-HT) by the enzyme aromatic-L-amino-acid decarboxylase with the help of vitamin B6.[4] This reaction occurs both in nervous tissue and in the liver.[5] 5-HTP crosses the blood-brain barrier,[6] while 5-HT does not. Excess 5-HTP, especially when administered with Vitamin B6, is thought to be metabolized and excreted.[7][8]
5-HTP AAAD Serotonin 
PLP 
Pharmacology
The psychoactive action of 5-HTP is derived from its effect on the production of serotonin in central nervous system tissue. More specifically, 5-HTP increases the production of serotonin.[9] Thus, it has been used to treat conditions such as depression, for which the lack of serotonin is thought to be a contributing factor.[10]
Research shows that co-administration with carbidopa greatly increases plasma 5-HTP levels.[11] However, several studies have reported that 5-HTP is effective even without a peripheral decarboxylase inhibitor (e.g. carbidopa).[12] Other studies have indicated the risk of a scleroderma-like condition resulting from the combination of 5-HTP and carbidopa.[13]
Dietary sources
Though 5-HTP is found in food only in insignificant quantities, it is a chemical involved intermediately in the metabolism of tryptophan, an amino acid found in turkey, milk, potatoes, pumpkin, and various greens.[14] See also the section Dietary sources of the article on L-tryptophan.
Therapeutic use
5-HTP is sold over-the-counter in the United States, the United Kingdom, and Canada as a dietary supplement for use as an antidepressant, appetite suppressant, and sleep aid. 5-HTP in supplement form is typically sold in 50 mg or 100 mg gelatin or vegetarian capsules. It is usually sourced from the seeds of Griffonia simplicifolia.
5-HTP has been studied and shown to be of benefit in the following conditions: primary fibromyalgia syndrome,[15] Friedreich's ataxia,[16] depression, anxiety, binge eating associated with obesity, and insomnia.[17] There is no statistically significant difference between 5-HTP and placebo in treating chronic headaches (primary or otherwise).[18]
A 2001 meta-analysis found that of 108 studies on 5-HTP published between 1966 and 2000, only two met the authors' quality standards for inclusion. The two studies that were deemed of sufficient quality did not deal with 5-HTP exclusively, instead combining results for 5-HTP and tryptophan, so the results may not be completely applicable for 5-HTP alone. While the combined analysis of the two 5-HTP and tryptophan studies showed significant effectiveness over placebo in treating depression, the authors state that overall "the evidence was of insufficient quality to be conclusive". They also state that "because alternative antidepressants exist which have been proven to be effective and safe, the clinical usefulness of 5-HTP and tryptophan is limited at present".[3]
Possible risks or side effects
Because 5-HTP has not been thoroughly studied in a clinical setting, possible side effects and interactions with other drugs are not well known.
Administered serotonin has been shown to increase the risk of heart valve disease in animals.[19][20] 5-HTP has not been subjected to this test. Oral 5-HTP results in an increase in urinary 5-HIAA, a serotonin metabolite, indicating that 5-HTP is peripherally metabolized to serotonin, which is then metabolized. This might cause a false positive test in tests looking for carcinoid syndrome.[21]
5-HTP can cause hypertension by increasing plasma renin activity, when not co-administered with a peripheral aromatic L-amino acid decarboxylase inhibitor, such as carbidopa or benserazide.[22]
Direct and indirect evidence for possible yet unproven risks and side effects associated with 5-HTP when overdosed:
- Heart valve damage or disease (cardiac fibrosis).[19][20]
- When combined with MAOIs or SSRIs, 5-HTP can cause acute serotonin syndrome.[23][24]
- When combined with carbidopa (as a treatment for symptoms of Parkinson's disease), 5-HTP causes nausea and vomiting; however this can be alleviated via administration of granisetron.[25] As mentioned above under pharmacology, cases of scleroderma-like illness have been reported in patients using carbidopa and 5-HTP.[26]
It has been suggested that 5-HTP may cause eosinophilia-myalgia syndrome (EMS), a serious condition which results in extreme muscle tenderness, myalgia, and blood abnormalities. However, there is evidence to show that EMS was caused by a contaminant in early 5-HTP supplements, before the introduction of the current Good Manufacturing Practices by the United States FDA in 2007. Many countries now employ similar regulation..[27]
See also
References
- ^ a b Turner EH, Blackwell AD (2005). "5-Hydroxytryptophan plus SSRIs for interferon-induced depression: synergistic mechanisms for normalizing synaptic serotonin". Medical Hypotheses 65 (1): 138–44. doi:10.1016/j.mehy.2005.01.026. PMID 15893130. http://linkinghub.elsevier.com/retrieve/pii/S0306-9877(05)00068-X.
- ^ Swiss Pharmaceutical Society (2000). Index Nominum 2000: International Drug Directory (Book with CD-ROM). Boca Raton: Medpharm Scientific Publishers. ISBN 3-88763-075-0. http://books.google.com/?id=5GpcTQD_L2oC&lpg=PA1528&pg=PA773#v=onepage.
- ^ a b Shaw K, Turner J, Del Mar C (2002). Shaw, Kelly A. ed. "Tryptophan and 5-hydroxytryptophan for depression". Cochrane Database of Systematic Reviews (Online) (1): CD003198. doi:10.1002/14651858.CD003198. PMID 11869656.
- ^ Rahman MK, Nagatsu T, Sakurai T, Hori S, Abe M, Matsuda M (1982). "Effect of pyridoxal phosphate deficiency on aromatic L-amino acid decarboxylase activity with L-DOPA and L-5-hydroxytryptophan as substrates in rats". Jpn. J. Pharmacol. 32 (5): 803–11. doi:10.1254/jjp.32.803. PMID 6983619.
- ^ Bouchard, S; Bousquet, C; Roberge, AG (1981). "Characteristics of dihydroxyphenylalanine/5-hydroxytryptophan decarboxylase activity in brain and liver of cat". Journal of neurochemistry 37 (3): 781–7. PMID 6974228.
- ^ Gomes P, Soares-da-Silva P. (1999). "L-DOPA transport properties in an immortalised cell line of rat capillary cerebral endothelial cells, RBE 4". Brain Res. 829 (1–2): 143–150. doi:10.1016/S0006-8993(99)01387-6. PMID 18445233.
- ^ Bouchard S, Roberge AG (1979). "Biochemical properties and kinetic parameters of dihydroxyphenylalanine--5-hydroxytryptophan decarboxylase in brain, liver, and adrenals of cat". Can. J. Biochem. 57 (7): 1014–8. doi:10.1139/o79-126. PMID 39668.
- ^ Amamoto T, Sarai K (1976). "On the tryptophan-serotonin metabolism in manic-depressive disorders. Changes in plasma 5-HT and 5-HIAA levels and urinary 5-HIAA excretion following oral loading of L-5HTP in patients with depression". Hiroshima J. Med. Sci. 25 (2–3): 135–40. PMID 1088369.
- ^ "5-HTP: Uses, Side Effects, Interactions and Warnings - WebMD". http://www.webmd.com/vitamins-supplements/ingredientmono-794-5-HTP.aspx?activeIngredientId=794&activeIngredientName=5-HTP. Retrieved 2009-10-05.
- ^ "Health.com: 5-hydroxytryptophan : Information on Uses, Dosage & Side Effects on Health.com". http://tools.health.com/natstandardcontent/5-htp-1#H7. Retrieved 2009-10-05.[dead link]
- ^ Magnussen I, Jensen TS, Rand JH, Van Woert MH (1981). "Plasma accumulation of metabolism of orally administered single dose L-5-hydroxytryptophan in man". Acta pharmacologica et toxicologica 49 (3): 184–9. doi:10.1111/j.1600-0773.1981.tb00890.x. PMID 6175178.
- ^ Birdsall TC (1998). "5-Hydroxytryptophan: a clinically-effective serotonin precursor". Alternative medicine review : a journal of clinical therapeutic 3 (4): 271–80. PMID 9727088.
- ^ Sternberg EM, Van Woert MH, Young SN, et al. (1980). "Development of a scleroderma-like illness during therapy with L-5-hydroxytryptophan and carbidopa". N. Engl. J. Med. 303 (14): 782–7. doi:10.1056/NEJM198010023031403. PMID 6997735.
- ^ "5-Hydroxytryptophan". University of Maryland Medical Center. http://www.umm.edu/altmed/articles/5-hydroxytryptophan-000283.htm. Retrieved 2010-01-21.
- ^ Caruso I, Sarzi Puttini P, Cazzola M, Azzolini V (1990). "Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome". The Journal of International Medical Research 18 (3): 201–9. PMID 2193835.
- ^ Trouillas P, Serratrice G, Laplane D, et al. (May 1995). "Levorotatory form of 5-hydroxytryptophan in Friedreich's ataxia. Results of a double-blind drug-placebo cooperative study". Archives of Neurology 52 (5): 456–60. PMID 7733839. http://archneur.ama-assn.org/cgi/pmidlookup?view=long&pmid=7733839. Retrieved 2009-07-30.
- ^ Birdsall TC (August 1998). "5-Hydroxytryptophan: a clinically-effective serotonin precursor". Alternative Medicine Review : a Journal of Clinical Therapeutic 3 (4): 271–80. PMID 9727088. http://www.thorne.com/altmedrev/.fulltext/3/4/271.pdf. Retrieved 2009-07-30.
- ^ De Benedittis G, Massei R (1985). "Serotonin precursors in chronic primary headache. A double-blind cross-over study with L-5-hydroxytryptophan vs. placebo". Journal of Neurosurgical Sciences 29 (3): 239–48. PMID 3913752.
- ^ a b Gustafsson BI, Tømmerås K, Nordrum I, Loennechen JP, Brunsvik A, Solligård E, Fossmark R, Bakke I, Syversen U, Waldum H (March 2005). "Long-term serotonin administration induces heart valve disease in rats". Circulation 111 (12): 1517–22. doi:10.1161/01.CIR.0000159356.42064.48. PMID 15781732.
- ^ a b Xu J, Jian B, Chu R, Lu Z, Li Q, Dunlop J, Rosenzweig-Lipson S, McGonigle P, Levy RJ, Liang B (December 2002). "Serotonin Mechanisms in Heart Valve Disease II : The 5-HT2 Receptor and Its Signaling Pathway in Aortic Valve Interstitial Cells". Am. J. Pathol. 161 (6): 2209–18. doi:10.1016/S0002-9440(10)64497-5. PMC 1850896. PMID 12466135. http://ajp.amjpathol.org/cgi/content/abstract/161/6/2209.
- ^ Joy T, Walsh G, Tokmakejian S, Van Uum SH (January 2008). "Increase of urinary 5-hydroxyindoleacetic acid excretion but not serum chromogranin A following over-the-counter 5-hydroxytryptophan intake". Can. J. Gastroenterol. 22 (1): 49–53. PMC 2659120. PMID 18209781. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2659120.
- ^ Barney CC, Threatte RM, Kikta DC, Fregly MJ. (June 1981). "Effects of serotonin and L-5-hydroxytryptophan on plasma renin activity in rats". Pharmacol Biochem Behav. 14 (6): 895–900. doi:10.1016/0091-3057(81)90380-4. PMID 7019933.
- ^ Ma Z, Zhang G, Jenney C, Krishnamoorthy S, Tao R. (July 2008). "Characterization of serotonin-toxicity syndrome (toxidrome) elicited by 5-hydroxy-l-tryptophan in clorgyline-pretreated rats". Eur J Pharmacol. 588 (2–3): 198–206. doi:10.1016/j.ejphar.2008.04.004. PMID 18499101.
- ^ Izumi T, Iwamoto N, Kitaichi Y, Kato A, Inoue T, Koyama T. (2006). "Effects of co-administration of a selective serotonin reuptake inhibitor and monoamine oxidase inhibitors on 5-HT-related behavior in rats". Eur J Pharmacol. 532 (3): 258–264. doi:10.1016/j.ejphar.2005.12.075. PMID 16488409.
- ^ Jacobs G, Kamerling I, de Kam M, et al. (Nov 2008). "Enhanced tolerability of the 5-hydroxytryptophane challenge test combined with granisetron". J Psychopharmacol. (Oxford) 24 (1): 65–72. doi:10.1177/0269881108094299. PMID 18719048.
- ^ http://www.truestarhealth.com/Notes/1339004.html
- ^ Michelson, D; Page, SW, Casey, R, Trucksess, MW, Love, LA, Milstien, S, Wilson, C, Massaquoi, SG, Crofford, LJ, Hallett, M (1994 Dec). "An eosinophilia-myalgia syndrome related disorder associated with exposure to L-5-hydroxytryptophan". The Journal of rheumatology 21 (12): 2261–5. PMID 7699627.
Further reading
- den Boer JA, Westenberg HG (1990). "Behavioral, neuroendocrine, and biochemical effects of 5-hydroxytryptophan administration in panic disorder". Psychiatry research 31 (3): 267–78. doi:10.1016/0165-1781(90)90096-N. PMID 2139731.
- Angst J, Woggon B, Schoepf J (1977). "The treatment of depression with L-5-hydroxytryptophan versus imipramine. Results of two open and one double-blind study". Archiv für Psychiatrie und Nervenkrankheiten 224 (2): 175–86. PMID 336002.
- article at Psychology Today
- Turner EH, Loftis JM, Blackwell AD (2006). "Serotonin a la carte: supplementation with the serotonin precursor 5-hydroxytryptophan". Pharmacol. Ther. 109 (3): 325–38. doi:10.1016/j.pharmthera.2005.06.004. PMID 16023217.
- 5-Hydroxytryptophan (5-HTP) Supplement Information at University of Maryland Medical Center
Antidepressants (N06A) Specific reuptake inhibitors (RIs), enhancers (REs), and releasing agents (RAs) Alaproclate • Citalopram • Escitalopram • Femoxetine • Fluoxetine# • Fluvoxamine • Indalpine • Ifoxetine • Litoxetine • Lubazodone • Panuramine • Paroxetine • Pirandamine • Seproxetine • Sertraline# • Vilazodone • Zimelidine‡Bicifadine • Clovoxamine • Desvenlafaxine • Duloxetine • Levomilnacipran • Eclanamine • Milnacipran • Sibutramine • VenlafaxineSerotonin–norepinephrine–dopamine reuptake inhibitors (SNDRIs)Brasofensine • BTS-74,398 • Cocaine • Diclofensine • DOV-21,947 • DOV-102,677 • DOV-216,303 • EXP-561 • Fezolamine • JNJ-7925476 • NS-2359 • PRC200-SS • Pridefine • SEP-225,289 • SEP-227,162 • TesofensineAmedalin • Atomoxetine/Tomoxetine • Binedaline • Ciclazindol • Daledalin • Esreboxetine • Lortalamine • Mazindol • Nisoxetine • Reboxetine • Talopram • Talsupram • Tandamine • ViloxazineDopamine reuptake inhibitors (DRIs)Amineptine • Bupropion/Amfebutamone# • Cilobamine • Manifaxine • Methylphenidate • Nomifensine • Radafaxine • TametralineNorepinephrine-dopamine releasing agents (NDRAs)Serotonin-norepinephrine-dopamine releasing agents (SNDRAs)4-Methyl-αMT • αET/Etryptamine • αMT/MetryptamineOthersIndeloxazine • Teniloxazine • Tramadol • ViqualineReceptor antagonists and/or reuptake inhibitors Serotonin antagonists and reuptake inhibitors (SARIs)Serotonin modulators and stimulators (SMSs)VortioxetineTricyclic and tetracyclic antidepressants (TCAs/TeCAs) TricyclicsAmezepine • Amineptine • Amitriptyline# • Amitriptylinoxide • Azepindole • Butriptyline • Cianopramine • Clomipramine • Cotriptyline • Cyanodothiepin • Demexiptiline • Depramine/Balipramine • Desipramine • Dibenzepin • Dimetacrine • Dosulepin/Dothiepin • Doxepin • Enprazepine • Fluotracen • Hepzidine • Homopipramol • Imipramine • Imipraminoxide • Intriptyline • Iprindole • Ketipramine • Litracen • Lofepramine • Losindole • Mariptiline • Melitracen • Metapramine • Mezepine • Naranol • Nitroxazepine • Nortriptyline • Noxiptiline • Octriptyline • Opipramol • Pipofezine • Propizepine • Protriptyline • Quinupramine • Tampramine • Tianeptine • Tienopramine • Trimipramine;7-OH-Amoxapine • Amoxapine • Aptazapine • Azipramine • Ciclazindol • Ciclopramine • Esmirtazapine • Loxapine • Maprotiline • Mazindol • Mianserin • Mirtazapine • Oxaprotiline • Setiptiline/TeciptilineMonoamine oxidase inhibitors (MAOIs) NonselectiveIrreversible: Benmoxin • Echinopsidine • Iproclozide • Iproniazid • Isocarboxazid • Mebanazine • Metfendrazine • Nialamide • Octamoxin • Phenelzine • Pheniprazine • Phenoxypropazine • Pivalylbenzhydrazine • Safrazine • Tranylcypromine; Reversible: Caroxazone • Paraxazone;MAOA-SelectiveIrreversible: Clorgiline; Reversible: Amiflamine • Bazinaprine • Befloxatone • Befol • Brofaromine • Cimoxatone • Esuperone • Harmala Alkaloids (Harmine, Harmaline, Tetrahydroharmine, Harman, Norharman, etc) • Methylene Blue • Metralindole • Minaprine • Moclobemide • Pirlindole • Sercloremine • Tetrindole • Toloxatone • Tyrima;MAOB-SelectiveIrreversible: Ladostigil • Mofegiline • Pargyline • Rasagiline • Selegiline; Reversible: Lazabemide • MilacemideAzapirones and other 5-HT1A receptor agonists Alnespirone • Aripiprazole • Befiradol • Buspirone • Eptapirone • Flesinoxan • Flibanserin • Gepirone • Ipsapirone • Oxaflozane • Tandospirone • Vilazodone • ZalospironeAntiobesity agents/Anorectics (A08) Central 4-Methylamphetamine • Amfecloral • Amfepentorex • Amfepramone • Aminorex • Amphetamine • Amphetaminil • Atomoxetine • Benfluorex‡ • Benzphetamine • Bupropion • Cathine • Cathinone • Chlorphentermine • Ciclazindol • Clobenzorex • Cloforex • Clominorex • Clortermine • Dexfenfluramine • Dextroamphetamine • Dextromethamphetamine • Dexmethylphenidate • Difemetorex • Dimethylcathinone • Diphemethoxidine • Ephedrine • Ephedra • Ethylamphetamine • Etolorex • Fenbutrazate • Fencamfamine • Fenethylline • Fenfluramine (+phentermine) • Fenproporex • Fludorex • Fluminorex • Furfenorex • Indanorex • Khat • Levopropylhexedrine • Lisdexamfetamine • Manifaxine • Mazindol • Mefenorex • Methamphetamine • Methylphenidate • Norfenfluramine • Pemoline • Pentorex (Phenpentermine) • Phendimetrazine • Phenethylamine • Phenmetrazine • Phentermine • Phenylpropanolamine • Pipradrol • Prolintane • Propylhexedrine • Pseudoephedrine • Pyrovalerone • Radafaxine • Reboxetine • Setazindol • Sibutramine • Synephrine • Tesofensine • Viloxazine • Xylopropamine • ZylofuramineCannabinoidsOthers5-HTP • Galactomannan (Guar Gum) • Glucomannan • L-DOPA • L-Phenylalanine • L-Tryptophan • L-Tyrosine • Lorcaserin • Lu AA-33810 • Metformin • Naltrexone • Naloxone • Oxyntomodulin • P57 • Peptide YY • Topiramate • Yohimbine (Yohimbe) • ZonisamidePeripheral M: NUT
cof, enz, met
noco, nuvi, sysi/epon, met
drug(A8/11/12)
Hypnotics/Sedatives (N05C) GABAA Agonists/PAMs Barbiturates: Allobarbital • Amobarbital • Aprobarbital • Barbital • Butabarbital • Butobarbital • Cyclobarbital • Ethallobarbital • Heptabarbital • Hexobarbital • Mephobarbital • Methohexital • Pentobarbital • Phenobarbital • Proxibarbal • Reposal • Secobarbital • Talbutal • Thiamylal • Thiopental • Vinbarbital • Vinylbital; Benzodiazepines: Brotizolam • Clonazepam • Cinolazepam • Climazolam • Doxefazepam • Estazolam • Flunitrazepam • Flurazepam • Flutoprazepam • Haloxazolam • Loprazolam • Lormetazepam • Midazolam • Nimetazepam • Nitrazepam • Quazepam • Temazepam • Triazolam; Carbamates: Carisoprodol • Ethinamate • Hexapropymate • Meprobamate • Methocarbamol • Procymate • Tybamate; Neuroactive Steroids: Acebrochol • Allopregnanolone • Alphadolone • Alphaxolone • Eltanolone • Ganaxolone • Hydroxydione • Minaxolone • Org 20599 • Org 21465 • Tetrahydrodeoxycorticosterone; Nonbenzodiazepines: CL-218,872 • Eszopiclone • Indiplon • JM-1232 • Lirequinil • Necopidem • Pazinaclone • ROD-188 • Saripidem • Suproclone • Suriclone • SX-3228 • U-89843A • U-90042 • Zaleplon • Zolpidem • Zopiclone; Phenols: Fospropofol • Propofol; Piperidinediones: Glutethimide • Methyprylon • Pyrithyldione • Piperidione; Quinazolinones: Afloqualone • Cloroqualone • Diproqualone • Etaqualone • Mebroqualone • Mecloqualone • Methaqualone • Methylmethaqualone • Nitromethaqualone; Others: 2-Methyl-2-butanol • Acetophenone • Acetylglycinamide chloral hydrate • Bromide (Lithium bromide, Potassium bromide, Sodium bromide) • Centalun • Chloral hydrate • Chloralose • Chloralodol • Clomethiazole • Dichloralphenazone • Ethanol (Alcohol) • Ethchlorvynol • Etomidate • Gaboxadol • Loreclezole • Methylpentynol • Metomidate • Paraldehyde • Petrichloral • Sulfonmethane • Trichloroethanol • Triclofos • Valerenic acid (Valerian)GABAB Agonists H1 Inverse agonists Antihistamines: Captodiame • Cyproheptadine • Dimenhydrinate • Diphenhydramine • Doxylamine • Hydroxyzine • Methapyrilene • Pheniramine • Promethazine • Propiomazine; Others: Tricyclic antidepressants (Amitriptyline, Doxepin, Trimipramine, etc.) • Tetracyclic antidepressants (Mianserin, Mirtazapine, etc.) • Typical antipsychotics (Chlorpromazine, Thioridazine, etc.) • Atypical antipsychotics (Olanzapine, Quetiapine, Risperidone, etc.)α1-Adrenergic Antagonists Mianserin • Niaprazine • Trazodone; Others: Tricyclic antidepressants (Amitriptyline, Doxepin, Trimipramine, etc.) • Typical antipsychotics (Chlorpromazine, Thioridazine, etc.) • Atypical antipsychotics (Olanzapine, Quetiapine, Risperidone, etc.)α2-Adrenergic Agonists 4-NEMD • Clonidine • Detomidine • Dexmedetomidine • Lofexidine • Medetomidine • Romifidine • Tizanidine • Xylazine5-HT2A Antagonists Eplivanserin • Niaprazine • Pruvanserin • Trazodone • Volinanserin; Others: Tricyclic antidepressants (Amitriptyline, Doxepin, Trimipramine, etc.) • Tetracyclic antidepressants (Mianserin, Mirtazapine, etc.) • Typical antipsychotics (Chlorpromazine, Thioridazine, etc.) • Atypical antipsychotics (Olanzapine, Quetiapine, Risperidone, etc.)Melatonin Agonists Orexin Antagonists Almorexant • SB-334,867 • SB-408,124 • SB-649,868 • Suvorexant • TCS-OX2-29Others Acecarbromal • Apronal • Bromisoval • Cannabidiol (Cannabis) • Carbromal • Embutramide • Evoxine • Fenadiazole • Gabapentin • Kavalactones (Kava) • Mephenoxalone • Opiates/Opioids (Hydrocodone, Morphine (Opium), etc.) • Passion flower • Scopolamine (Mandrake) • Valnoctamidecatecholamines Catabolism/
metabolitesdopamine: DOPAL · DOPAC · MOPET · Hydroxytyrosol · 3-Methoxytyramine · Homovanillic acid
norepinephrine: 3,4-Dihydroxymandelic acid · Normetanephrine · Vanillylmandelic acid · 3-Methoxy-4-hydroxyphenylglycol · Dihydroxyphenylethylene glycol
epinephrine: Metanephrinetryptophan→serotonin anabolism: 5-Hydroxytryptophan
catabolism: 5-Hydroxyindoleacetic acidserotonin→melatonin Serotonergics 5-HT1 receptor ligands Agonists: Azapirones: Alnespirone • Binospirone • Buspirone • Enilospirone • Eptapirone • Gepirone • Ipsapirone • Perospirone • Revospirone • Tandospirone • Tiospirone • Umespirone • Zalospirone; Antidepressants: Etoperidone • Nefazodone • Trazodone • Vortioxetine; Antipsychotics: Aripiprazole • Asenapine • Clozapine • Quetiapine • Ziprasidone; Ergolines: Dihydroergotamine • Ergotamine • Lisuride • Methysergide • LSD; Tryptamines: 5-CT • 5-MeO-DMT • 5-MT • Bufotenin • DMT • Indorenate • Psilocin • Psilocybin; Others: 8-OH-DPAT • Adatanserin • Befiradol • BMY-14802 • Cannabidiol • Dimemebfe • Ebalzotan • Eltoprazine • F-11,461 • F-12,826 • F-13,714 • F-14,679 • F-15,063 • F-15,599 • Flesinoxan • Flibanserin • Lesopitron • LY-293,284 • LY-301,317 • MKC-242 • NBUMP • Osemozotan • Oxaflozane • Pardoprunox • Piclozotan • Rauwolscine • Repinotan • Roxindole • RU-24,969 • S 14,506 • S-14,671 • S-15,535 • Sarizotan • SSR-181,507 • Sunepitron • U-92,016-A • Urapidil • Vilazodone • Xaliproden • Yohimbine
Antagonists: Antipsychotics: Iloperidone • Risperidone • Sertindole; Beta blockers: Alprenolol • Cyanopindolol • Iodocyanopindolol • Oxprenolol • Pindobind • Pindolol • Propranolol • Tertatolol; Others: AV965 • BMY-7,378 • CSP-2503 • Dotarizine • Flopropione • GR-46611 • Isamoltane • Lecozotan • Mefway • Metitepine/Methiothepin • MPPF • NAN-190 • PRX-00023 • Robalzotan • S-15535 • SB-649,915 • SDZ 216-525 • Spiperone • Spiramide • Spiroxatrine • UH-301 • WAY-100,135 • WAY-100,635 • XylamidineAgonists: Lysergamides: Dihydroergotamine • Ergotamine • Methysergide; Piperazines: Eltoprazine • TFMPP; Triptans: Avitriptan • Eletriptan • Sumatriptan • Zolmitriptan; Tryptamines: 5-CT • 5-MT; Others: CGS-12066A • CP-93,129 • CP-94,253 • CP-135,807 • RU-24,969 • Vortioxetine
Antagonists: Lysergamides: Metergoline; Others: AR-A000002 • Elzasonan • GR-127,935 • Isamoltane • Metitepine/Methiothepin • SB-216,641 • SB-224,289 • SB-236,057 • YohimbineAgonists: Lysergamides: Dihydroergotamine • Methysergide; Triptans: Almotriptan • Avitriptan • Eletriptan • Frovatriptan • Naratriptan • Rizatriptan • Sumatriptan • Zolmitriptan; Tryptamines: 5-CT • 5-Ethyl-DMT • 5-MT • 5-(Nonyloxy)tryptamine; Others: CP-135,807 • CP-286,601 • GR-46611 • L-694,247 • L-772,405 • PNU-109,291 • PNU-142,633
Antagonists: Lysergamides: Metergoline; Others: Alniditan • BRL-15,572 • Elzasonan • GR-127,935 • Ketanserin • LY-310,762 • LY-367,642 • LY-456,219 • LY-456,220 • Metitepine/Methiothepin • Ritanserin • Yohimbine • ZiprasidoneAgonists: Lysergamides: Methysergide; Triptans: Eletriptan; Tryptamines: BRL-54443 • Tryptamine
Antagonists: Metitepine/MethiothepinAgonists: Triptans: Eletriptan • Naratriptan • Sumatriptan; Tryptamines: 5-MT; Others: BRL-54443 • Lasmiditan • LY-334,370
Antagonists: Metitepine/Methiothepin5-HT2 receptor ligands Agonists: Lysergamides: ALD-52 • Ergometrine • Lisuride • LA-SS-Az • LSD • LSD-Pip • Lysergic acid 2-butyl amide • Lysergic acid 3-pentyl amide • Methysergide; Phenethylamines: 25I-NBF • 25I-NBMD • 25I-NBOH • 25I-NBOMe • 2C-B • 2C-B-FLY • 2CB-Ind • 2C-C-NBOMe • 2C-E • 2C-I • 2C-TFM-NBOMe • 2C-T-2 • 2C-T-7 • 2C-T-21 • 2CBCB-NBOMe • 2CBFly-NBOMe • Bromo-DragonFLY • DOB • DOC • DOI • DOM • MDA • MDMA • Mescaline • TCB-2 • TFMFly; Piperazines: BZP • Quipazine • TFMPP; Tryptamines: 5-CT • 5-MeO-α-ET • 5-MeO-α-MT • 5-MeO-DET • 5-MeO-DiPT • 5-MeO-DMT • 5-MeO-DPT • 5-MT • α-ET • α-Methyl-5-HT • α-MT • Bufotenin • DET • DiPT • DMT • DPT • Psilocin • Psilocybin; Others: AL-34662 • AL-37350A • Dimemebfe • Medifoxamine • Oxaflozane • PNU-22394 • RH-34
Antagonists: Atypical antipsychotics: Amperozide • Aripiprazole • Carpipramine • Clocapramine • Clozapine • Gevotroline • Iloperidone • Melperone • Mosapramine • Olanzapine • Paliperidone • Pimozide • Quetiapine • Risperidone • Sertindole • Ziprasidone • Zotepine; Typical antipsychotics: Loxapine • Pipamperone; Antidepressants: Amitriptyline • Amoxapine • Aptazapine • Etoperidone • Mianserin • Mirtazapine • Nefazodone • Teniloxazine • Trazodone; Others: 5-I-R91150 • AC-90179 • Adatanserin • Altanserin • AMDA • APD-215 • Blonanserin • Cinanserin • CSP-2503 • Cyproheptadine • Deramciclane • Dotarizine • Eplivanserin • Esmirtazapine • Fananserin • Flibanserin • Ketanserin • KML-010 • Lubazodone • Mepiprazole • Metitepine/Methiothepin • Nantenine • Pimavanserin • Pizotifen • Pruvanserin • Rauwolscine • Ritanserin • S-14,671 • Sarpogrelate • Setoperone • Spiperone • Spiramide • SR-46349B • Volinanserin • Xylamidine • YohimbineAgonists: Oxazolines: 4-Methylaminorex • Aminorex; Phenethylamines: Chlorphentermine • Cloforex • DOB • DOC • DOI • DOM • Fenfluramine • MDA • MDMA • Norfenfluramine; Tryptamines: 5-CT • 5-MT • α-Methyl-5-HT; Others: BW-723C86 • Cabergoline • mCPP • Pergolide • PNU-22394 • Ro60-0175
Antagonists: Agomelatine • Asenapine • EGIS-7625 • Ketanserin • Lisuride • LY-272,015 • Metitepine/Methiothepin • PRX-08066 • Rauwolscine • Ritanserin • RS-127,445 • Sarpogrelate • SB-200,646 • SB-204,741 • SB-206,553 • SB-215,505 • SB-221,284 • SB-228,357 • SDZ SER-082 • Tegaserod • YohimbineAgonists: Phenethylamines: 2C-B • 2C-E • 2C-I • 2C-T-2 • 2C-T-7 • 2C-T-21 • DOB • DOC • DOI • DOM • MDA • MDMA • Mescaline; Piperazines: Aripiprazole • mCPP • TFMPP; Tryptamines: 5-CT • 5-MeO-α-ET • 5-MeO-α-MT • 5-MeO-DET • 5-MeO-DiPT • 5-MeO-DMT • 5-MeO-DPT • 5-MT • α-ET • α-Methyl-5-HT • α-MT • Bufotenin • DET • DiPT • DMT • DPT • Psilocin • Psilocybin; Others: A-372,159 • AL-38022A • CP-809,101 • Dimemebfe • Lorcaserin• Medifoxamine • MK-212 • Org 12,962 • ORG-37,684 • Oxaflozane • PNU-22394 • Ro60-0175 • Ro60-0213 • Vabicaserin • WAY-629 • WAY-161,503 • YM-348
Antagonists: Atypical antipsychotics: Clozapine • Iloperidone • Melperone • Olanzapine • Paliperidone • Pimozide • Quetiapine • Risperidone • Sertindole • Ziprasidone • Zotepine; Typical antipsychotics: Chlorpromazine • Loxapine • Pipamperone; Antidepressants: Agomelatine • Amitriptyline • Amoxapine • Aptazapine • Etoperidone • Fluoxetine • Mianserin • Mirtazapine • Nefazodone • Nortriptyline • Tedatioxetine • Trazodone; Others: Adatanserin • Cinanserin • Cyproheptadine • Deramciclane • Dotarizine • Eltoprazine • Esmirtazapine • FR-260,010 • Ketanserin • Ketotifen • Latrepirdine • Metitepine/Methiothepin • Methysergide • Pizotifen • Ritanserin • RS-102,221 • S-14,671 • SB-200,646 • SB-206,553 • SB-221,284 • SB-228,357 • SB-242,084 • SB-243,213 • SDZ SER-082 • Xylamidine5-HT3, 5-HT4, 5-HT5, 5-HT6, 5-HT7 ligands Agonists: Piperazines: BZP • Quipazine; Tryptamines: 2-Methyl-5-HT • 5-CT; Others: Chlorophenylbiguanide • Butanol • Ethanol • Halothane • Isoflurane • RS-56812 • SR-57,227 • SR-57,227-A • Toluene • Trichloroethane • Trichloroethanol • Trichloroethylene • YM-31636
Antagonists: Antiemetics: AS-8112 • Alosetron • Azasetron • Batanopride • Bemesetron • Cilansetron • Dazopride • Dolasetron • Granisetron • Lerisetron • Ondansetron • Palonosetron • Ramosetron • Renzapride • Tropisetron • Zacopride • Zatosetron; Atypical antipsychotics: Clozapine • Olanzapine • Quetiapine; Tetracyclic antidepressants: Amoxapine • Mianserin • Mirtazapine; Others: CSP-2503 • ICS-205,930 • MDL-72,222 • Memantine • Nitrous Oxide • Ricasetron • Sevoflurane • Tedatioxetine • Thujone • Vortioxetine • XenonAgonists: Gastroprokinetic Agents: Cinitapride • Cisapride • Dazopride • Metoclopramide • Mosapride • Prucalopride • Renzapride • Tegaserod • Velusetrag • Zacopride; Others: 5-MT • BIMU8 • CJ-033,466 • PRX-03140 • RS-67333 • RS-67506 • SL65.0155 • Antagonists: GR-113,808 • GR-125,487 • L-Lysine • Piboserod • RS-39604 • RS-67532 • SB-203,186 • SB-204,070Agonists: Lysergamides: Ergotamine • LSD; Tryptamines: 5-CT; Others: Valerenic Acid
Antagonists: Asenapine • Latrepirdine • Metitepine/Methiothepin • Ritanserin • SB-699,551
* Note that the 5-HT5B receptor is not functional in humans.Agonists: Lysergamides: Dihydroergotamine • Ergotamine • Lisuride • LSD • Mesulergine • Metergoline • Methysergide; Tryptamines: 2-Methyl-5-HT • 5-BT • 5-CT • 5-MT • Bufotenin • E-6801 • E-6837 • EMD-386,088 • EMDT • LY-586,713 • Tryptamine; Others: WAY-181,187 • WAY-208,466
Antagonists: Antidepressants: Amitriptyline • Amoxapine • Clomipramine • Doxepin • Mianserin • Nortriptyline; Atypical antipsychotics: Aripiprazole • Asenapine • Clozapine • Fluperlapine • Iloperidone • Olanzapine • Tiospirone; Typical antipsychotics: Chlorpromazine • Loxapine; Others: BGC20-760 • BVT-5182 • BVT-74316 • Cerlapirdine • EGIS-12,233 • GW-742,457 • Ketanserin • Latrepirdine • Lu AE58054 • Metitepine/Methiothepin • MS-245 • PRX-07034 • Ritanserin • Ro04-6790 • Ro 63-0563 • SB-258,585 • SB-271,046 • SB-357,134 • SB-399,885 • SB-742,457Agonists: Lysergamides: LSD; Tryptamines: 5-CT • 5-MT • Bufotenin; Others: 8-OH-DPAT • AS-19 • Bifeprunox • E-55888 • LP-12 • LP-44 • RU-24,969 • Sarizotan
Antagonists: Lysergamides: 2-Bromo-LSD • Bromocriptine • Dihydroergotamine • Ergotamine • Mesulergine • Metergoline • Methysergide; Antidepressants: Amitriptyline • Amoxapine • Clomipramine • Imipramine • Maprotiline • Mianserin; Atypical antipsychotics: Amisulpride • Aripiprazole • Clozapine • Olanzapine • Risperidone • Sertindole • Tiospirone • Ziprasidone • Zotepine; Typical antipsychotics: Chlorpromazine • Loxapine; Others: Butaclamol • EGIS-12,233 • Ketanserin • LY-215,840 • Metitepine/Methiothepin • Pimozide • Ritanserin • SB-258,719 • SB-258,741 • SB-269,970 • SB-656,104 • SB-656,104-A • SB-691,673 • SLV-313 • SLV-314 • Spiperone • SSR-181,507 • VortioxetineReuptake inhibitors Selective serotonin reuptake inhibitors (SSRIs): Alaproclate • Citalopram • Dapoxetine • Desmethylcitalopram • Desmethylsertraline • Escitalopram • Femoxetine • Fluoxetine • Fluvoxamine • Indalpine • Ifoxetine • Litoxetine • Lubazodone • Panuramine • Paroxetine • Pirandamine • RTI-353 • Seproxetine • Sertraline • Tedatioxetine • Vilazodone • Vortioxetine • Zimelidine; Serotonin-norepinephrine reuptake inhibitors (SNRIs): Bicifadine • Desvenlafaxine • Duloxetine • Eclanamine • Levomilnacipran • Milnacipran • Sibutramine • Venlafaxine; Serotonin-norepinephrine-dopamine reuptake inhibitors (SNDRIs): Brasofensine • Diclofensine • DOV-102,677 • DOV-21,947 • DOV-216,303 • NS-2359 • SEP-225289 • SEP-227,162 • Tesofensine; Tricyclic antidepressants (TCAs): Amitriptyline • Butriptyline • Cianopramine • Clomipramine • Desipramine • Dosulepin • Doxepin • Imipramine • Lofepramine • Nortriptyline • Pipofezine • Protriptyline • Trimipramine; Tetracyclic antidepressants (TeCAs): Amoxapine; Piperazines: Nefazodone • Trazodone; Antihistamines: Brompheniramine • Chlorphenamine • Diphenhydramine • Mepyramine/Pyrilamine • Pheniramine • Tripelennamine; Opioids: Pethidine • Methadone • Propoxyphene; Others: Cocaine • CP-39,332 • Cyclobenzaprine • Dextromethorphan • Dextrorphan • EXP-561 • Fezolamine • Mesembrine • Nefopam • PIM-35 • Pridefine • Roxindole • SB-649,915 • ZiprasidoneReleasing agents Aminoindanes: 5-IAI • AMMI • ETAI • MDAI • MDMAI • MMAI • TAI; Aminotetralins: 6-CAT • 8-OH-DPAT • MDAT • MDMAT; Oxazolines: 4-Methylaminorex • Aminorex • Clominorex • Fluminorex; Phenethylamines (also Amphetamines, Cathinones, Phentermines, etc): 2-Methyl-MDA • 4-CAB • 4-FA • 4-FMA • 4-HA • 4-MTA • 5-APDB • 5-Methyl-MDA • 6-APDB • 6-Methyl-MDA • AEMMA • Amiflamine • BDB • BOH • Brephedrone • Butylone • Chlorphentermine • Cloforex • Amfepramone • Metamfepramone • DCA • DFMDA • DMA • DMMA • EBDB • EDMA • Ethylone • Etolorex • Fenfluramine (Dexfenfluramine) • Flephedrone • IAP • IMP • Lophophine • MBDB • MDA • MDEA • MDHMA • MDMA • MDMPEA • MDOH • MDPEA • Mephedrone • Methedrone • Methylone • MMA • MMDA • MMDMA • MMMA • NAP • Norfenfluramine • 4-TFMA • pBA • pCA • pIA • PMA • PMEA • PMMA • TAP; Piperazines: 2C-B-BZP • 2-BZP • 3-MeOPP • BZP • DCPP • MBZP • mCPP • MDBZP • MeOPP • Mepiprazole • pCPP • pFPP • pTFMPP • TFMPP; Tryptamines: 4-Methyl-αET • 4-Methyl-αMT • 5-CT • 5-MeO-αET • 5-MeO-αMT • 5-MT • αET • αMT • DMT • Tryptamine (itself); Others: Indeloxazine • Tramadol • ViqualineEnzyme inhibitors AGN-2979 • FenclonineNonselective: Benmoxin • Caroxazone • Echinopsidine • Furazolidone • Hydralazine • Indantadol • Iproclozide • Iproniazid • Isocarboxazid • Isoniazid • Linezolid • Mebanazine • Metfendrazine • Nialamide • Octamoxin • Paraxazone • Phenelzine • Pheniprazine • Phenoxypropazine • Pivalylbenzhydrazine • Procarbazine • Safrazine • Tranylcypromine; MAO-A Selective: Amiflamine • Bazinaprine • Befloxatone • Befol • Brofaromine • Cimoxatone • Clorgiline • Esuprone • Harmala alkaloids (Harmine, Harmaline, Tetrahydroharmine, Harman, Norharman, etc) • Methylene Blue • Metralindole • Minaprine • Moclobemide • Pirlindole • Sercloremine • Tetrindole • Toloxatone • TyrimaOthers L-Tryptophan → 5-HTPFerrous iron (Fe2+) • Magnesium (Mg2+) • Tetrahydrobiopterin • Vitamin B3 (Niacin, Nicotinamide → NADPH) • Vitamin B6 (Pyridoxine, Pyridoxamine, Pyridoxal → Pyridoxal phosphate) • Vitamin B9 (Folic Acid → Tetrahydrofolic acid) • Vitamin C (Ascorbic acid) • Zinc (Zn2+)OthersTryptamines 1-(2-Dimethylaminoethyl)dihydropyrano(3,2-e)indole • 2-Methyl-5-HT • 4-Acetoxy-DET • 4-Acetoxy-DIPT • 4-Acetoxy-DMT • 4-HO-αMT • 4-HO-DIPT • 4-HO-MET • 4-MeO-DMT • 4-Methyl-αET • 4-Methyl-αMT • 5-Benzyloxytryptamine • 5-Bromo-DMT • 5-Carboxamidotryptamine • 5-Ethoxy-αMT • 5-Fluoro-αMT • 5-HO-αMT • 5-HTP • 5-Ethoxy-DMT • 5-Ethyl-DMT • 5-Fluoro-DMT • 5-Methyl-DMT • 5-Methoxytryptamine • 5-MeO-7,N,N-TMT • 5-Methyl-αET • 5-MeO-αET • 5-MeO-αMT • 5-MeO-DALT • 5-MeO-DET • 5-MeO-DIPT • 5-MeO-DMT • 5-MeO-DPT • 5-MeO-MALT • 5-MeO-MIPT • 5,7-Dihydroxytryptamine • 5-(Nonyloxy)tryptamine • 6-Fluoro-αMT • 7-Methyl-αET • 7-Methyl-DMT • αET • αMT • Aeruginascin • AL-37350A • BW-723C86 • Baeocystin • Bufotenidine • Bufotenin • DALT • Desformylflustrabromine • DET • DiPT • DMT • DPT • Ethocybin • EiPT • EMDT • EPT • Ethocin • FGIN-127 • FGIN-143 • Ibogaine • Indorenate • Iprocin • MET • MiPT • Miprocin • Melatonin • MS-245 • NAS • NMT • Norbaeocystin • Normelatonin • Oxypertine • PiPT • Psilocin • Psilocybin • Rizatriptan • Serotonin • Sumatriptan • Tryptamine • Tryptophan • Yohimbine • Yuremamine • Zolmitriptan
Categories:- Dietary supplements
- Nootropics
- Tryptamines
- Amino acids
Wikimedia Foundation. 2010.
