Serotonin receptor agonist

Short description: Neurotransmission-modulating substance

Not to be confused with Serotonin receptor antagonist.

The neurotransmitter serotonin (illustration) has various receptors.

A serotonin receptor agonist is an agonist of one or more serotonin receptors. They activate serotonin receptors in a manner similar to that of serotonin (5-hydroxytryptamine; 5-HT), a neurotransmitter and hormone and the endogenous ligand of the serotonin receptors.

## Contents

* 1 Non-selective agonists
* 2 5-HT1 receptor agonists
* 2.1 5-HT1A receptor agonists
* 2.2 5-HT1B receptor agonists
* 2.3 5-HT1D receptor agonists
* 2.4 5-HT1E receptor agonists
* 2.5 5-HT1F receptor agonists
* 3 5-HT2 receptor agonists
* 3.1 5-HT2A receptor agonists
* 3.2 5-HT2B receptor agonists
* 3.3 5-HT2C receptor agonists
* 4 5-HT3 receptor agonists
* 5 5-HT4 receptor agonists
* 6 5-HT5A receptor agonists
* 7 5-HT6 receptor agonists
* 8 5-HT7 receptor agonists
* 9 See also
* 10 References
* 11 External links

## Non-selective agonists

Serotonergic psychedelics such as tryptamines (e.g., psilocybin, psilocin, DMT, 5-MeO-DMT, bufotenin), lysergamides (e.g., LSD, ergine (LSA)), phenethylamines (e.g., mescaline, 2C-B, 25I-NBOMe), and amphetamines (e.g., MDA, DOM) are non-selective agonists of serotonin receptors. Their hallucinogenic effects are specifically mediated by activation of the 5-HT2A receptor.

Drugs that increase extracellular serotonin levels such as serotonin reuptake inhibitors (e.g., fluoxetine, venlafaxine), serotonin releasing agents (e.g., fenfluramine, MDMA), and monoamine oxidase inhibitors (e.g., phenelzine, moclobemide) are indirect non-selective serotonin receptor agonists. They are used variously as antidepressants, anxiolytics, antiobsessionals, appetite suppressants, and entactogens.

## 5-HT1 receptor agonists

### 5-HT1A receptor agonists

Azapirones such as buspirone, gepirone, and tandospirone are 5-HT1A receptor partial agonists marketed primarily as anxiolytics, but also as antidepressants. The antidepressants vilazodone and vortioxetine are 5-HT1A receptor partial agonists. Flibanserin, a drug used for female sexual dysfunction, is a 5-HT1A receptor partial agonist.[1] Many atypical antipsychotics, such as aripiprazole, asenapine, clozapine, lurasidone, quetiapine, and ziprasidone, are 5-HT1A receptor partial agonists, and this action is thought to contribute to their beneficial effects on negative symptoms in schizophrenia.

### 5-HT1B receptor agonists

Triptans such as sumatriptan, rizatriptan, and naratriptan are 5-HT1B receptor agonists that are used to abort migraine and cluster headache attacks. The ergoline antimigraine agent ergotamine also acts on this receptor.

Serenics such as batoprazine, eltoprazine, and fluprazine are agonists of the 5-HT1B receptor and other serotonin receptors, and have been found to produce antiaggressive effects in animals, but have not been marketed. Eltoprazine is under development for the treatment of aggression and for other indications.[2]

### 5-HT1D receptor agonists

Main article: Chemistry:5-HT1D receptor agonist

In addition to being 5-HT1B agonists, triptans (i.e. sumatriptan, almotriptan, zolmitriptan, naratriptan, eletriptan, frovatriptan and rizatriptan) are also agonists at the 5-HT1D receptor, which contributes to their antimigraine effect caused by vasoconstriction of blood vessels in the brain. The same is true for ergotamine.

### 5-HT1E receptor agonists

The triptan eletriptan is an agonist of the 5-HT1E receptor. BRL-54443 is a selective 5-HT1E and 5-HT1F receptor agonist which is used in scientific research.

### 5-HT1F receptor agonists

Triptans such as eletriptan, naratriptan, and sumatriptan are agonists of the 5-HT1F receptor. Lasmiditan is a selective 5-HT1F agonist that is under development by Eli Lilly and Company for the treatment of migraine.[3][4]

## 5-HT2 receptor agonists

### 5-HT2A receptor agonists

See also: Chemistry:Serotonin 5-HT2A receptor agonist, 5-HT2A receptor § Agonists, and Serotonergic psychedelic

Serotonergic psychedelics like psilocybin, LSD, and mescaline act as 5-HT2A receptor agonists. Their actions at this receptor are thought to be responsible for their hallucinogenic effects. Most of these drugs also act as agonists of other serotonin receptors. Not all 5-HT2A receptor agonists are psychoactive.[5]

The 25-NB (NBOMe) series is a family of phenethylamine serotonergic psychedelics that, unlike other classes of serotonergic psychedelics, act as highly selective 5-HT2A receptor agonists.[6] The most well-known member of the 25-NB series is 25I-NBOMe.[7][8] (2S,6S)-DMBMPP is an analogue of the 25-NB compounds and is the most highly selective agonist of the 5-HT2A receptor that has been identified to date.[9] O-4310 (1-isopropyl-6-fluoropsilocin) is a tryptamine derivative that is a highly selective agonist of the 5-HT2A receptor.[10]

Selective 5-HT2A receptor agonists like the 25-NB compounds, specifically those which can behave as full agonists at this receptor, can cause serotonin syndrome-like adverse effects such as hyperthermia, hyperpyrexia, tachycardia, hypertension, clonus, seizures, agitation, aggression, and hallucinations which has ended in death on numerous occasions despite these particular drugs only being available to drug users for about 2–3 years, being widely in use mostly in the period from 2010-2012. Bans were put in place around 2012-2013 by countries where they had risen to popularity. They quickly and often accidentally lead to overdose.[8][11] In contrast to the aforementioned drugs's potent, selective, and most importantly, full agonism (meaning the drug can fully activate the receptor to 100% of its activation potential, and does so even with minuscule amounts due to high potency, LSD, like the other "safe" psychedelics which are almost impossible to overdose fatally on, is a partial agonist, and this means it has a limit of how much it can activate the receptor, a limit which is basically impossible to exceed even with exponentially larger amounts of the drug. These partial agonists have proven relatively safe after having seen widespread abuse by drug users for many decades.[11] Activation of the 5-HT2A receptor is also implicated in serotonin syndrome caused by indirect serotonin receptor agonists like serotonin reuptake inhibitors, serotonin releasing agents, and monoamine oxidase inhibitors.[11][12] Antagonists of the 5-HT2A receptor like cyproheptadine and chlorpromazine are able to reverse and mediate recovery from serotonin syndrome.[13]

### 5-HT2B receptor agonists

Agonists of the 5-HT2B receptor are in the development of cardiac fibrosis.[14] Fenfluramine, pergolide, and cabergoline have been withdrawn from some markets for this reason.[15] Many serotonergic psychedelics, such as LSD and psilocin, have been shown to activate this receptor directly.[16] MDMA has been reported to be both a potent direct agonist[14] and have an indirect effect by increasing plasma serotonin levels.[17]

### 5-HT2C receptor agonists

Main article: Chemistry:5-HT2C receptor agonist

Lorcaserin is an appetite suppressant and anti-obesity drug which acts as a selective 5-HT2C receptor agonist. meta-Chlorophenylpiperazine (mCPP) is a 5-HT2C-preferring serotonin receptor agonist that induces anxiety and depression and can cause panic attacks in susceptible individuals.

## 5-HT3 receptor agonists

2-Methyl-5-hydroxytryptamine (2-methylserotonin) and quipazine are moderately selective agonists of the 5-HT3 receptor that are used in scientific research. Agonists of this receptor are known to induce nausea and vomiting, and are not used medically.

## 5-HT4 receptor agonists

Cisapride and tegaserod are 5-HT4 receptor partial agonists that were used to treat disorders of gastrointestinal motility. Prucalopride is a highly selective 5-HT4 receptor agonist that can be used to treat certain disorders of gastrointestinal motility. Other 5-HT4 receptor agonists have shown potential to be nootropic and antidepressant drugs, but have not been marketed for such indications.

## 5-HT5A receptor agonists

Valerenic acid, a constituent of valerian root, has been found to act as a 5-HT5A receptor agonist, and this action could be involved in the sleep-promoting effects of valerian.

## 5-HT6 receptor agonists

No selective agonists of the 5-HT6 receptor have been approved for medical use. Selective 5-HT6 receptor agonists like E-6801, E-6837, EMDT, WAY-181,187, and WAY-208,466 show antidepressant, anxiolytic, antiobsessional, and appetite suppressant effects in animals, but also impair cognition and memory.[18]

## 5-HT7 receptor agonists

AS-19 is a 5-HT7 receptor agonist that has been used in scientific research.

## See also

* Serotonin receptor antagonist

## References

1. ↑ "Flibanserin: MedlinePlus Drug Information". https://medlineplus.gov/druginfo/meds/a615040.html.
2. ↑ "Eltoprazine - Elto Pharma - AdisInsight". http://adisinsight.springer.com/drugs/800000719.
3. ↑ "Lasmiditan for the treatment of migraine". Expert Opin Investig Drugs 26 (2): 227–234. 2017. doi:10.1080/13543784.2017.1280457. PMID 28076702.
4. ↑ "Lasmiditan - Eli Lilly and Company - AdisInsight". http://adisinsight.springer.com/drugs/800028519.
5. ↑ Aghajanian GK, Marek GJ (1999). "Serotonin and Hallucinogens". Neuropharmacology 21 (2S): 16S–23S. doi:10.1016/s0893-133x(98)00135-3. PMID 10432484.
6. ↑ Pharmacology and Toxicology of N-Benzylphenethylamine ("NBOMe") Hallucinogens. Current Topics in Behavioral Neurosciences. 32. 2017. pp. 283–311. doi:10.1007/7854_2016_64. ISBN 978-3-319-52442-9.
7. ↑ "The NBOMe hallucinogenic drug series: Patterns of use, characteristics of users and self-reported effects in a large international sample". J. Psychopharmacol. (Oxford) 28 (8): 780–8. 2014. doi:10.1177/0269881114523866. PMID 24569095. https://researchrepository.rmit.edu.au/view/delivery/61RMIT_INST/12247449250001341/13257311840001341.
8. ↑ 8.0 8.1 "Prevalence of use and acute toxicity associated with the use of NBOMe drugs". Clin Toxicol 53 (2): 85–92. 2015. doi:10.3109/15563650.2015.1004179. PMID 25658166.
9. ↑ "Extensive rigid analogue design maps the binding conformation of potent N-benzylphenethylamine 5-HT2A serotonin receptor agonist ligands". ACS Chem Neurosci 4 (1): 96–109. 2013. doi:10.1021/cn3000668. PMID 23336049.
10. ↑ "Indole compounds useful as serotonin selective agents". https://patents.google.com/patent/US7655691.
11. ↑ 11.0 11.1 11.2 "Toxicities associated with NBOMe ingestion-a novel class of potent hallucinogens: a review of the literature". Psychosomatics 56 (2): 129–39. 2015. doi:10.1016/j.psym.2014.11.002. PMID 25659919.
12. ↑ "A review of serotonin toxicity data: implications for the mechanisms of antidepressant drug action". Biol. Psychiatry 59 (11): 1046–51. 2006. doi:10.1016/j.biopsych.2005.11.016. PMID 16460699.
13. ↑ "Overview of serotonin syndrome". Ann Clin Psychiatry 24 (4): 310–8. 2012. PMID 23145389.
14. ↑ 14.0 14.1 Hutcheson, J. D., Setola, V., Roth, B. L., & Merryman, W. D. (2011). Serotonin receptors and heart valve disease—it was meant 2B. Pharmacology & Therapeutics, 132(2), 146-157.
15. ↑ Brea, J., Castro-Palomino, J., Yeste, S., Cubero, E., Párraga, A., Domínguez, E., & Loza, M. I. (2010). Emerging Opportunities and Concerns for Drug Discovery at Serotonin 5-HT2B Receptors. Current Topics in Medicinal Chemistry, 10(5), 493-503.
16. ↑ Halberstadt, A. L., & Geyer, M. A. (2011). Multiple receptors contribute to the behavioral effects of indoleamine hallucinogens. Neuropharmacology, 61(3), 364-381.
17. ↑ Zolkowska, D., Rothman, R. B., & Baumann, M. H. (2006). Amphetamine analogs increase plasma serotonin: implications for cardiac and pulmonary disease. Journal of Pharmacology and Experimental Therapeutics, 318(2), 604-610.
18. ↑ "Therapeutic Potential of 5-HT6 Receptor Agonists". J. Med. Chem. 58 (20): 7901–12. 2015. doi:10.1021/acs.jmedchem.5b00179. PMID 26099069.

## External links

* IUPHAR GPCR Database - 5-HT receptor family
* MeSH list of agents 82017366
* Serotonin+agonists at the US National Library of Medicine Medical Subject Headings (MeSH)

* v
* t
* e

Pharmacomodulation

Types|

* ♦ Enzyme: Inducer
* Inhibitor

* ♦ Ion channel: Opener
* Blocker

* ♦ Receptor: Agonist
* Partial agonist
* Antagonist
* Inverse agonist
* Positive allosteric modulator (PAM)
* Negative allosteric modulator (NAM)

* ♦ Transporter [Reuptake vs Efflux]: Enhancer (RE)
* Inhibitor (RI)
* Releaser (RA)

* ♦ Miscellaneous: Precursor
* Cofactor

Classes|

| Enzyme|

see Enzyme inhibition

|

Ion channel|

See Ion channel modulators

Receptor &
transporter|

| BA/M|

| Adrenergic|

* Adrenergic receptor agonist (α
* β (1
* 2))
* Adrenergic receptor antagonist (α (1
* 2)
* β)
* Norepinephrine reuptake inhibitor (NRI)

|

Dopaminergic|

* Dopamine receptor agonist
* Dopamine receptor antagonist
* Dopamine reuptake inhibitor (DRI)

Histaminergic|

* Histamine receptor agonist
* Histamine receptor antagonist (H1
* H2
* H3)

Serotonergic|

* Serotonin receptor agonist
* Serotonin receptor antagonist (5-HT3)
* Serotonin reuptake inhibitor (SRI)

AA|

| GABAergic|

* GABA receptor agonist
* GABA receptor antagonist
* GABA reuptake inhibitor (GRI)

|

Glutamatergic|

* Glutamate receptor agonist (AMPA)
* Glutamate receptor antagonist (NMDA)
* Glutamate reuptake inhibitor

Cholinergic|

* Acetylcholine receptor agonist (Muscarinic
* Nicotinic)
* Acetylcholine receptor antagonist (Muscarinic
* Nicotinic (Ganglionic
* Muscular))

Cannabinoidergic|

* Cannabinoid receptor agonist
* Cannabinoid receptor antagonist
* Endocannabinoid enhancer (eCBE)
* Endocannabinoid reuptake inhibitor (eCBRI)

Opioidergic|

* Opioid modulator
* Opioid receptor agonist
* Opioid receptor antagonist
* Enkephalinase inhibitor

Other|

* Adenosine reuptake inhibitor (AdoRI)
* Angiotensin II receptor antagonist
* Endothelin receptor antagonist
* NK1 receptor antagonist
* Vasopressin receptor antagonist

Miscellaneous|

* Cofactor (see Enzyme cofactors)
* Precursor (see Amino acids)

* v
* t
* e

Serotonin receptor modulators

5-HT1|

| 5-HT1A|

* Agonists: 8-OH-DPAT
* Adatanserin
* Amphetamine
* Antidepressants (e.g., etoperidone, hydroxynefazodone, nefazodone, trazodone, triazoledione, vilazodone, vortioxetine)
* Atypical antipsychotics (e.g., aripiprazole, asenapine, brexpiprazole, cariprazine, clozapine, lurasidone, quetiapine, ziprasidone)
* Azapirones (e.g., buspirone, eptapirone, gepirone, perospirone, tandospirone)
* Bay R 1531
* Befiradol
* BMY-14802
* Cannabidiol
* Dimemebfe
* Dopamine
* Ebalzotan
* Eltoprazine
* Enciprazine
* Ergolines (e.g., bromocriptine, cabergoline, dihydroergotamine, ergotamine, lisuride, LSD, methylergometrine (methylergonovine), methysergide, pergolide)
* F-11461
* F-12826
* F-13714
* F-14679
* F-15063
* F-15,599
* Flesinoxan
* Flibanserin
* Flumexadol
* Hypidone
* Lesopitron
* LY-293284
* LY-301317
* mCPP
* MKC-242
* Naluzotan
* NBUMP
* Osemozotan
* Oxaflozane
* Pardoprunox
* Piclozotan
* Rauwolscine
* Repinotan
* Roxindole
* RU-24,969
* S-14,506
* S-14671
* S-15535
* Sarizotan
* Serotonin (5-HT)
* SSR-181507
* Sunepitron
* Tryptamines (e.g., 5-CT, 5-MeO-DMT, 5-MT, bufotenin, DMT, indorenate, N-Me-5-HT, psilocin, psilocybin)
* TGBA01AD
* U-92,016-A
* Urapidil
* Vilazodone
* Xaliproden
* Yohimbine

* Antagonists: Atypical antipsychotics (e.g., iloperidone, risperidone, sertindole)
* AV965
* Beta blockers (e.g., alprenolol, carteolol, cyanopindolol, iodocyanopindolol, isamoltane, oxprenolol, penbutolol, pindobind, pindolol, propranolol, tertatolol)
* BMY-7,378
* CSP-2503
* Dotarizine
* Ergolines (e.g., metergoline)
* FCE-24379
* Flopropione
* GR-46611
* Isamoltane
* Lecozotan
* Mefway
* Metitepine (methiothepin)
* MIN-117 (WF-516)
* MPPF
* NAN-190
* Robalzotan
* S-15535
* SB-649,915
* SDZ 216-525
* Spiperone
* Spiramide
* Spiroxatrine
* UH-301
* WAY-100135
* WAY-100635
* Xylamidine

* Unknown/unsorted: Acetryptine
* Carvedilol
* Ergolines (e.g., ergometrine (ergonovine))

5-HT1B|

* Agonists: Anpirtoline
* CGS-12066A
* CP-93129
* CP-94253
* CP-122,288
* CP-135807
* Eltoprazine
* Ergolines (e.g., bromocriptine, dihydroergotamine, ergotamine, methylergometrine (methylergonovine), methysergide, pergolide)
* mCPP
* RU-24,969
* Serotonin (5-HT)
* Triptans (e.g., avitriptan, donitriptan, eletriptan, sumatriptan, zolmitriptan)
* TFMPP
* Tryptamines (e.g., 5-BT, 5-CT, 5-MT, DMT)
* Vortioxetine

* Antagonists: AR-A000002
* Beta blockers (e.g., alprenolol, carteolol, isamoltane, oxprenolol, penbutolol, propranolol, tertatolol)
* Elzasonan
* Ergolines (e.g., metergoline)
* GR-127935
* Isamoltane
* LY-393558
* Metitepine (methiothepin)
* SB-216641
* SB-224289
* SB-236057
* Yohimbine

* Unknown/unsorted: Ergolines (e.g., cabergoline, ergometrine (ergonovine), lisuride)

5-HT1D|

* Agonists: CP-122,288
* CP-135807
* CP-286601
* Ergolines (e.g., bromocriptine, cabergoline, dihydroergotamine, ergotamine, LSD, methysergide)
* Chemistry:GR-46611
* L-694247
* Chemistry:L-772405
* mCPP
* PNU-109291
* PNU-142633
* Serotonin (5-HT)
* TGBA01AD
* Triptans (e.g., almotriptan, avitriptan, donitriptan, [[Chemistry:Eleeletriptan, Frovatriptan|frovatriptan]], naratriptan, rizatriptan, sumatriptan, zolmitriptan)
* Tryptamines (e.g., 5-BT, 5-CT, 5-Et-DMT, 5-MT, 5-(nonyloxy)tryptamine, DMT)

* Antagonists: Alniditan
* BRL-15,572
* Elzasonan
* Ergolines (e.g., metergoline)
* GR-127935
* Ketanserin
* LY-310762
* LY-367642
* LY-393558
* LY-456219
* LY-456220
* Metitepine (methiothepin)
* Mianserin
* Ritanserin
* Yohimbine
* Ziprasidone

* Unknown/unsorted: Acetryptine
* Ergolines (e.g., lisuride, lysergol, pergolide)

5-HT1E|

* Agonists: BRL-54443
* Ergolines (e.g., methysergide)
* Serotonin (5-HT)
* Triptans (e.g., eletriptan)
* Tryptamines (e.g., tryptamine)

* Antagonists: Metitepine (methiothepin)

* Unknown/unsorted: ErgIrindaloneolines (e.g., ergometrine (ergonovine), lysergol, methylergometrine (methylergonovine)

5-HT1F|

* Agonists: BRL-54443
* CP-122,288
* Ergolines (e.g., bromocriptine, lysergol, methylergometrine (methylergonovine) methysergide)
* Lasmiditan
* LY-334370
* Serotonin (5-HT)
* Triptans (e.g., eletriptan, naratriptan, sumatriptan)
* Tryptamines (e.g., 5-MT)

* Antagonists: Metitepine (methiothepin)
* Mianserin

5-HT2|

| 5-HT2A|

* Agonists: 25H/NB series (e.g., 25I-NBF, 25I-NBMD, 25I-NBOH, 25I-NBOMe, 25B-NBOMe, 25C-NBOMe, 25TFM-NBOMe, 2CBCB-NBOMe, 25CN-NBOH, 2CBFly-NBOMe)
* 2Cs (e.g., 2C-B, 2C-E, 2C-I, 2C-T-2, 2C-T-7, 2C-T-21)
* 2C-B-FLY
* 2CB-Ind
* 5-Methoxytryptamines (5-MeO-DET, 5-MeO-DiPT, 5-MeO-DMT, 5-MeO-DPT, 5-MT)
* α-Alkyltryptamines (e.g., 5-Cl-αMT, 5-Fl-αMT, 5-MeO-αET, 5-MeO-αMT, α-Me-5-HT, αET, αMT)
* AL-34662
* AL-37350A
* Bromo-DragonFLY
* Dimemebfe
* DMBMPP
* DOx (e.g., DOB, DOC, DOI, DOM)
* Efavirenz
* Ergolines (e.g., 1P-LSD, ALD-52, bromocriptine, cabergoline, ergine (LSA), ergometrine (ergonovine), ergotamine, lisuride, LA-SS-Az, LSB, LSD, LSD-Pip, LSH, LSP, methylergometrine (methylergonovine), pergolide)
* Flumexadol
* IHCH-7113
* Jimscaline
* Lorcaserin
* MDxx (e.g., MDA (tenamfetamine), MDMA (midomafetamine), MDOH, MMDA)
* O-4310
* Oxaflozane
* PHA-57378
* PNU-22394
* PNU-181731
* RH-34
* SCHEMBL5334361
* Phenethylamines (e.g., lophophine, mescaline)
* Piperazines (e.g., BZP, quipazine, TFMPP)
* Serotonin (5-HT)
* TCB-2
* TFMFly
* Tryptamines (e.g., 5-BT, 5-CT, bufotenin, DET, DiPT, DMT, DPT, psilocin, psilocybin, tryptamine)

* Antagonists: 5-I-R91150
* 5-MeO-NBpBrT
* AC-90179
* Adatanserin
* Altanserin
* Antihistamines (e.g., cyproheptadine, hydroxyzine, ketotifen, perlapine)
* AMDA
* Atypical antipsychotics (e.g., amperozide, aripiprazole, asenapine, blonanserin, brexpiprazole, carpipramine, clocapramine, clorotepine, clozapine, fluperlapine, gevotroline, iloperidone, lurasidone, melperone, mosapramine, ocaperidone, olanzapine, paliperidone, quetiapine, risperidone, sertindole, zicronapine, ziprasidone, zotepine)
* Chlorprothixene
* Cinanserin
* CSP-2503
* Deramciclane
* Dotarizine
* Eplivanserin
* Ergolines (e.g., amesergide, LY-53857, LY-215,840, mesulergine, metergoline, methysergide, sergolexole)
* Fananserin
* Flibanserin
* Glemanserin
* Irindalone
* Ketanserin
* KML-010
* Landipirdine
* LY-393558
* mCPP
* Medifoxamine
* Metitepine (methiothepin)
* MIN-117 (WF-516)
* Naftidrofuryl
* Nantenine
* Nelotanserin
* Opiranserin (VVZ-149)
* Pelanserin
* Phenoxybenzamine
* Pimavanserin
* Pirenperone
* Pizotifen
* Pruvanserin
* Rauwolscine
* Ritanserin
* Roluperidone
* S-14671
* Sarpogrelate
* Serotonin antagonists and reuptake inhibitors (e.g., etoperidone, hydroxynefazodone, lubazodone, mepiprazole, nefazodone, triazoledione, trazodone)
* SR-46349B
* TGBA01AD
* Teniloxazine
* Temanogrel
* Tetracyclic antidepressants (e.g., amoxapine, aptazapine, esmirtazapine, maprotiline, mianserin, mirtazapine)
* Tricyclic antidepressants (e.g., amitriptyline)
* Typical antipsychotics (e.g., chlorpromazine, fluphenazine, haloperidol, loxapine, perphenazine, pimozide, pipamperone, prochlorperazine, setoperone, spiperone, spiramide, thioridazine, thiothixene, trifluoperazine)
* Volinanserin
* Xylamidine
* Yohimbine

* Unknown/unsorted: Ergolines (e.g., dihydroergotamine, nicergoline)

5-HT2B|

* Agonists: 4-Methylaminorex
* Aminorex
* Amphetamines (e.g., chlorphentermine, cloforex, dexfenfluramine, fenfluramine, levofenfluramine, norfenfluramine)
* BW-723C86
* DOx (e.g., DOB, DOC, DOI, DOM)
* Ergolines (e.g., cabergoline, dihydroergocryptine, dihydroergotamine, ergotamine, methylergometrine (methylergonovine), methysergide, pergolide)
* Lorcaserin
* MDxx (e.g., MDA (tenamfetamine), MDMA (midomafetamine), MDOH, MMDA)
* Piperazines (e.g., TFMPP)
* PNU-22394
* Ro60-0175
* Serotonin (5-HT)
* Tryptamines (e.g., 5-BT, 5-CT, 5-MT, α-Me-5-HT, bufotenin, DET, DiPT, DMT, DPT, psilocin, psilocybin, tryptamine)

* Antagonists: Agomelatine
* Atypical antipsychotics (e.g., amisulpride, aripiprazole, asenapine, brexpiprazole, cariprazine, clozapine, N-desalkylquetiapine (norquetiapine), N-desmethylclozapine (norclozapine), olanzapine, pipamperone, quetiapine, risperidone, ziprasidone)
* Cyproheptadine
* EGIS-7625
* Ergolines (e.g., amesergide, bromocriptine, lisuride, LY-53857, LY-272015, mesulergine)
* Ketanserin
* LY-393558
* mCPP
* Metadoxine
* Metitepine (methiothepin)
* Pirenperone
* Pizotifen
* Propranolol
* PRX-08066
* Rauwolscine
* Ritanserin
* RS-127445
* Sarpogrelate
* SB-200646
* SB-204741
* SB-206553
* SB-215505
* SB-221284
* SB-228357
* SDZ SER-082
* Tegaserod
* Tetracyclic antidepressants (e.g., amoxapine, mianserin, mirtazapine)
* Trazodone
* Typical antipsychotics (e.g., chlorpromazine)
* TIK-301
* Yohimbine

* Unknown/unsorted: Ergolines (e.g., ergometrine (ergonovine))

5-HT2C|

* Agonists: 2Cs (e.g., 2C-B, 2C-E, 2C-I, 2C-T-2, 2C-T-7, 2C-T-21)
* 5-Methoxytryptamines (5-MeO-DET, 5-MeO-DiPT, 5-MeO-DMT, 5-MeO-DPT, 5-MT)
* α-Alkyltryptamines (e.g., 5-Cl-αMT, 5-Fl-αMT, 5-MeO-αET, 5-MeO-αMT, α-Me-5-HT, αET, αMT)
* A-372159
* AL-38022A
* Alstonine
* CP-809101
* Dimemebfe
* DOx (e.g., DOB, DOC, DOI, DOM)
* Ergolines (e.g., ALD-52, cabergoline, dihydroergotamine, ergine (LSA), ergotamine, lisuride, LA-SS-Az, LSB, LSD, LSD-Pip, LSH, LSP, pergolide)
* Flumexadol
* Lorcaserin
* MDxx (e.g., MDA (tenamfetamine), MDMA (midomafetamine), MDOH, MMDA)
* MK-212
* ORG-12962
* ORG-37684
* Oxaflozane
* PHA-57378
* Phenethylamines (e.g., lophophine, mescaline)
* Piperazines (e.g., aripiprazole, BZP, mCPP, quipazine, TFMPP)
* PNU-22394
* PNU-181731
* Ro60-0175
* Ro60-0213
* Serotonin (5-HT)
* Tryptamines (e.g., 5-BT, 5-CT, bufotenin, DET, DiPT, DMT, DPT, psilocin, psilocybin, tryptamine)
* Vabicaserin
* WAY-629
* WAY-161503
* YM-348

* Antagonists: Adatanserin
* Agomelatine
* Atypical antipsychotics (e.g., asenapine, clorotepine, clozapine, fluperlapine, iloperidone, melperone, olanzapine, paliperidone, quetiapine, risperidone, sertindole, ziprasidone, zotepine)
* Captodiame
* CEPC
* Cinanserin
* Cyproheptadine
* Deramciclane
* Desmetramadol
* Dotarizine
* Eltoprazine
* Ergolines (e.g., amesergide, bromocriptine, LY-53857, LY-215,840, mesulergine, metergoline, methysergide, sergolexole)
* Etoperidone
* Fluoxetine
* FR-260010
* Irindalone
* Ketanserin
* Ketotifen
* Latrepirdine (dimebolin)
* Medifoxamine
* Metitepine (methiothepin)
* Nefazodone
* Pirenperone
* Pizotifen
* Propranolol
* Ritanserin
* RS-102221
* S-14671
* SB-200646
* SB-206553
* SB-221284
* SB-228357
* SB-242084
* SB-243213
* SDZ SER-082
* Tedatioxetine
* Tetracyclic antidepressants (e.g., amoxapine, aptazapine, esmirtazapine, maprotiline, mianserin, mirtazapine)
* TIK-301
* Tramadol
* Trazodone
* Tricyclic antidepressants (e.g., amitriptyline, nortriptyline)
* Typical antipsychotics (e.g., chlorpromazine, loxapine, pimozide, pipamperone, thioridazine)
* Xylamidine

* Unknown/unsorted: Efavirenz
* Ergolines (e.g., ergometrine (ergonovine), methylergometrine (methylergonovine))

5-HT3–7|

| 5-HT3|

* Agonists: Alcohols (e.g., butanol, ethanol (alcohol), trichloroethanol)
* m-CPBG
* Phenylbiguanide
* Piperazines (e.g., BZP, mCPP, quipazine)
* RS-56812
* Serotonin (5-HT)
* SR-57227
* SR-57227A
* Tryptamines (e.g., 2-Me-5-HT, 5-CT, bufotenidine (5-HTQ))
* Volatiles/gases (e.g., halothane, isoflurane, toluene, trichloroethane)
* YM-31636

* Antagonists: Alosetron
* Chemistry:Arazasetron
* AS-8112
* Atypical antipsychotics (e.g., clozapine, olanzapine, quetiapine)
* Azasetron
* Batanopride
* Bemesetron (MDL-72222)
* Bupropion
* Cilansetron
* CSP-2503
* Dazopride
* Dolasetron
* Galanolactone
* Granisetron
* Hydroxybupropion
* Lerisetron
* Memantine
* Ondansetron
* Palonosetron
* Ramosetron
* Renzapride
* Ricasetron
* Tedatioxetine
* Tetracyclic antidepressants (e.g., amoxapine, mianserin, mirtazapine)
* Thujone
* Tropanserin
* Tropisetron
* Typical antipsychotics (e.g., loxapine)
* Volatiles/gases (e.g., nitrous oxide, sevoflurane, xenon)
* Vortioxetine
* Zacopride
* Zatosetron

* Unknown/unsorted: LY-53857
* Piperazines (e.g., naphthylpiperazine)

5-HT4|

* Agonists: 5-MT
* BIMU8
* Capeserod
* Cinitapride
* Cisapride
* CJ-033466
* Dazopride
* Metoclopramide
* Minesapride
* Mosapride
* Prucalopride
* PRX-03140
* Renzapride
* RS-67,333
* RS-67,506
* Serotonin (5-HT)
* Tegaserod
* Usmarapride
* Velusetrag
* Zacopride

* Antagonists: GR-113808
* GR-125487
* L-Lysine
* Piboserod
* RS-39604
* RS-67532
* SB-203186
* SB-204070

5-HT5A|

* Agonists: Ergolines (e.g., 2-Br-LSD (BOL-148), ergotamine, LSD)
* Serotonin (5-HT)
* Tryptamines (e.g., 5-CT)
* Valerenic acid

* Antagonists: Asenapine
* Latrepirdine (dimebolin)
* Metitepine (methiothepin)
* Ritanserin
* SB-699551

* Unknown/unsorted: Ergolines (e.g., metergoline, methysergide)
* Piperazines (e.g., naphthylpiperazine)

5-HT6|

* Agonists: Ergolines (e.g., dihydroergocryptine, dihydroergotamine, ergotamine, lisuride, LSD, mesulergine, metergoline, methysergide)
* Hypidone
* Serotonin (5-HT)
* Tryptamines (e.g., 2-Me-5-HT, 5-BT, 5-CT, 5-MT, Bufotenin, E-6801, E-6837, EMD-386088, EMDT, LY-586713, N-Me-5-HT, ST-1936, tryptamine)
* WAY-181187
* WAY-208466

* Antagonists: ABT-354
* Atypical antipsychotics (e.g., aripiprazole, asenapine, clorotepine, clozapine, fluperlapine, iloperidone, olanzapine, tiospirone)
* AVN-101
* AVN-211
* AVN-322
* AVN-397
* BGC20-760
* BVT-5182
* BVT-74316
* Cerlapirdine
* EGIS-12,233
* GW-742457
* Idalopirdine
* Ketanserin
* Landipirdine
* Latrepirdine (dimebolin)
* Masupirdine
* Metitepine (methiothepin)
* MS-245
* PRX-07034
* Ritanserin
* Ro 04-6790
* Ro 63-0563
* SB-258585
* SB-271046
* SB-357134
* SB-399885
* SB-742457
* Tetracyclic antidepressants (e.g., amoxapine, mianserin)
* Tricyclic antidepressants (e.g., amitriptyline, clomipramine, doxepin, nortriptyline)
* Typical antipsychotics (e.g., chlorpromazine, loxapine)

* Unknown/unsorted: Ergolines (e.g., 2-Br-LSD (BOL-148), bromocriptine, lergotrile, pergolide)
* Piperazines (e.g., naphthylpiperazine)

5-HT7|

* Agonists: 8-OH-DPAT
* AS-19
* Bifeprunox
* E-55888
* Ergolines (e.g., LSD)
* LP-12
* LP-44
* LP-211
* RU-24,969
* Sarizotan
* Serotonin (5-HT)
* Triptans (e.g., frovatriptan)
* Tryptamines (e.g., 5-CT, 5-MT, bufotenin, N-Me-5-HT)

* Antagonists: Atypical antipsychotics (e.g., amisulpride, aripiprazole, asenapine, brexpiprazole, clorotepine, clozapine, fluperlapine, olanzapine, risperidone, sertindole, tiospirone, ziprasidone, zotepine)
* Butaclamol
* DR-4485
* EGIS-12,233
* Ergolines (e.g., 2-Br-LSD (BOL-148), amesergide, bromocriptine, cabergoline, dihydroergotamine, ergotamine, LY-53857, LY-215,840, mesulergine, metergoline, methysergide, sergolexole)
* JNJ-18038683
* Ketanserin
* LY-215,840
* Metitepine (methiothepin)
* Ritanserin
* SB-258719
* SB-258741
* SB-269970
* SB-656104
* SB-656104A
* SB-691673
* SLV-313
* SLV-314
* Spiperone
* Chemistry:SSR-181507
* Tetracyclic antidepressants (e.g., amoxapine, maprotiline, mianserin, mirtazapine)
* Tricyclic antidepressants (e.g., amitriptyline, clomipramine, imipramine)
* Typical antipsychotics (e.g., acetophenazine, chlorpromazine, chlorprothixene, fluphenazine, loxapine, pimozide)
* Vortioxetine

* Unknown/unsorted: Ergolines (e.g., lisuride, pergolide)
* Piperazines (e.g., naphthylpiperazine)

* See also: Receptor/signaling modulators
* Adrenergics
* Dopaminergics
* Melatonergics
* Monoamine reuptake inhibitors and releasing agents
* Monoamine metabolism modulators
* Monoamine neurotoxins

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*[DMT]: dimethyltryptamine
*[LSD]: lysergic acid diethylamide
*[LSA]: lysergic acid amide
*[MDA]: 3,4-methylenedioxyamphetamine
*[DOM]: 2,5-dimethoxy-4-methylamphetamine
*[MDMA]: methylenedioxymethamphetamine
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