Methorphan

Methorphan
Systematic (IUPAC) name
3-methoxy-17-methylmorphinan
Clinical data
Pregnancy cat.	?
Legal status	?
Identifiers
CAS number	6031-86-3^N
ATC code	?
ChemSpider	16736909^Y
UNII	8YB8F78WM1^Y
ChEMBL	CHEMBL282713^Y
Chemical data
Formula	C₁₈H₂₅NO
Mol. mass	271.40 g/mol
SMILES	eMolecules & PubChem
InChI InChI=1S/C18H25NO/c1-19-10-9-18-8-4-3-5-15(18)17(19)11-13-6-7-14(20-2)12-16(13)18/h6-7,12,15,17H,3-5,8-11H2,1-2H3/t15?,17-,18-/m1/s1^Y Key:MKXZASYAUGDDCJ-HSFDIDPMSA-N^Y
N(what is this?) (verify)

Methorphan comes in two isomeric forms, each with differing pharmacology and effects:

Dextromethorphan - An over-the-counter cough suppressant, as well as dissociative hallucinogen.
Levomethorphan - A potent opioid analgesic that was never clinically developed.

Racemethorphan refers to the racemic mixture of both of these stereoisomers.

References

Cough and cold preparations (R05)

Expectorants

Althea root • Antimony pentasulfide • Creosote • Guaiacolsulfonate • Guaifenesin • Ipecacuanha (Syrup of ipecac) • Levoverbenone • Potassium iodide • Senega • Tyloxapol

Mucolytics

Acetylcysteine • Ambroxol • Bromhexine • Carbocisteine • Domiodol • Dornase alfa • Eprazinone • Erdosteine • Letosteine • Mesna • Neltenexine • Sobrerol • Stepronin • Tiopronin

Cough suppressants

Opium alkaloids, opioids, and derivatives	Acetyldihydrocodeine • Benzylmorphine • Codeine • Dextromethorphan • Diacetylmorphine • Dihydrocodeine • Dimemorfan • Droxypropine • Ethylmorphine • Hydrocodone • Hydromorphone • Isoaminile • Laudanum • Levomethadone • Levopropoxyphene • Methadone • Nicocodeine • Nicodicodeine • Normethadone • Noscapine • Pholcodine • Thebacon • Tipepidine • Zipeprol

Other	Benzonatate • Benproperine • Bibenzonium bromide • Butamirate • Clobutinol • Clofedanol • Cloperastine • Diphenhydramine • Dibunate • Dimethoxanate • Dropropizine • Fedrilate • Glaucine • Levodropropizine • Meprotixol • Morclofone • Nepinalone • Oxolamine • Oxeladin • Pentoxyverine • Pipazetate • Prenoxdiazine • Piperidione

M: RES

anat(n, x, l, c)/phys/devp

noco(c, p)/cong/tumr, sysi/epon, injr

proc, drug(R1/2/3/5/6/7)

Depressants

Antihistamines
H₁R inverse agonists

1st Generation	Dimenhydrinate • Diphenhydramine • Doxylamine • Hydroxyzine • Promethazine ...

Others	Amitriptyline • Doxepin • Mianserin • Mirtazapine ...

Antipsychotics
Mixed MOA

Typicals	Chlorpromazine • Haloperidol ...

Atypicals	Aripiprazole • Clozapine • Olanzapine • Quetiapine • Risperidone • Ziprasidone ...

Channel Blockers

Carbamazepine • Ethosuximide • Gabapentin • Lamotrigine • Oxcarbazepine • Phenytoin • Pregabalin • Topiramate • Zonisamide

Dissociatives
NMDAR Antagonists

Arylcyclohexylamines	3-MeO-PCP • Esketamine • Dieticyclidine • Eticyclidine • Gacyclidine • Ketamine • Phencyclidine • PCPr • Rolicyclidine • Tenocyclidine • Tiletamine

Morphinans	Dextromethorphan / Methorphan • Dextrorphan / Morphanol

Others	Dexoxadrol • Dizocilpine (MK-801) • Etoxadrol • Nitrous Oxide • Selfotel • Xenon ...

GABAergics

Barbiturates	Amobarbital • Pentobarbital • Phenobarbital • Secobarbital ...

Benzodiazepines	Alprazolam • Chlordiazepoxide • Clonazepam • Diazepam • Lorazepam ...

Carbamates	Carisoprodol • Felbamate • Meprobamate ...

GABA Analogues	1,4-BD • Aceburic Acid • Gabaculine • GBL • GABA • GABOB • GHB • GHV • GVL • Isovaleramide • Isovaleric Acid • Phenibut • Picamilon • Tiagabine • Valeric Acid • Valerenic Acid • Valnoctamide • Valproic Acid (Sodium Valproate / Valproate Semisodium) • Valpromide • Vigabatrin

Neuroactive Steroids	Alfaxalone • Allopregnanolone • Ganaxolone • Tetrahydrodeoxycorticosterone ...

Nonbenzodiazepines	Eszopiclone • Zaleplon • Zolpidem • Zopiclone ...

Piperidinediones	Glutethimide ...

Propyl phenols	Fospropofol • Propofol • Thymol

Quinazolinones	Methaqualone ...

Others	Baclofen • Clomethiazole • Diethyl Ether • Ethanol (Alcohol) • Etomidate • Gaboxadol • Muscimol • Stiripentol • Theanine • Kavalactones (Kava Kava) • Valerenic Acid (Valerian)

Glycinergics

Alanine • Cycloserine • Dimethylglycine • Glycine • Hypotaurine • Methylglycine / Sarcosine • Serine • Taurine • Trimethylglycine / Betaine

Narcotics
MOR Agonists

Opiates	Opium → Codeine • Morphine • Oripavine • Thebaine

Opioids	Alfentanil • Buprenorphine • Butorphanol • Carfentanil • Diacetylmorphine (Heroin) • Dihydrocodeine • Ethylmorphine • Etorphine • Fentanyl • Hydrocodone • Hydromorphone • Ketobemidone • Levacetylmethadol • Levorphanol • Meperidine / Pethidine • Methadone • Nalbuphine • Oxycodone • Oxymorphone • Pentazocine • Phenazocine • Propoxyphene • Remifentanil • Tapentadol • Tramadol • Sufentanil

Sympatholytics
α/β-AR Modulators

Alpha Blockers	Doxazosin • Phentolamine • Prazosin • Tamsulosin • Urapidil ...

Beta Blockers	Propranolol ...

Others	Clonidine ...

Miscellaneous

Chloroform • Cyclobenzaprine • Trazodone ...

Hallucinogens

Psychedelics
5-HT_2AR agonists

Phenethylamines: Aleph
2C-B
2C-B-Dragonfly
2C-B-FLY
2C-C-FLY
2C-D-FLY
2C-E-FLY
2C-I-FLY
2CBFly-NBOMe
2C-T-7-FLY
2C-C
2C-C-NBOMe
2C-CN-NBOMe
2C-D
2CD-5EtO
2C-D-NBOMe
2C-E
2C-EF
2C-E-NBOMe
2C-F
2C-F-NBOMe
2C-G
2C-G-NBOMe
2C-H-NBOMe
2C-I
2C-N
2C-N-NBOMe
2C-O
2C-O-4
2C-P
2C-T
2C-T-2
2C-T-4
2C-T-4-NBOMe
2C-T-7
2C-T-7-NBOH
2C-T-8
2C-T-9
2C-T-13
2C-T-15
2C-T-17
2C-T-21
2C-TFM
2C-TFM-NBOMe
2C-YN
2CBCB-NBOMe
25B-NBOMe
25I-NBMD
25I-NBOH
25I-NBOMe
3C-E
3C-P
5-APB
5-APDB
6-APB
6-APDB
Br-DFLY
DESOXY
DMMDA
DMMDA-2
DOB
DOB-FLY
DOM-FLY
DOC
DOEF
DOET
DOF
DOI
DOM
DON
DOPR
DOTFM
Escaline
Ganesha
HOT-2
HOT-7
HOT-17
IAP
Isoproscaline
Jimscaline
Lophophine
MDA
MDEA
MDMA
MMA
MMDA
MMDA-2
MMDA-3a
MMDMA
Macromerine
Mescaline
Methallylescaline
NBOMe-mescaline
Proscaline
TCB-2
TFMFly
TMA;

Piperazines: pFPP
TMFPP;

Tryptamines: 1-Methyl-5-methoxy-diisopropyltryptamine
2,N,N-TMT
4,N,N-TMT
4-HO-5-MeO-DMT
4-Acetoxy-DET
4-Acetoxy-DIPT
4-Acetoxy-DMT
4-Acetoxy-DPT
4-Acetoxy-MiPT
4-HO-DPT
4-HO-MET
4-Propionyloxy-DMT
4-HO-MPMI
5-Me-MIPT
5-N,N-TMT
5-AcO-DMT
5-MeO-2,N,N-TMT
5-MeO-4,N,N-TMT
5-MeO-α,N,N-TMT
5-MeO-α-ET
5-MeO-α-MT
5-MeO-DALT
5-MeO-DET
5-MeO-DIPT
5-MeO-DMT
5-MeO-DPT
5-MeO-EiPT
5-MeO-MET
5-MeO-MIPT
5-MeO-MPMI
7,N,N-TMT
α,N,N-TMT
α-ET
α-MT
AL-37350A
Baeocystin
Bufotenin
DALT
DBT
DCPT
DET
DIPT
DMT
DPT
EiPT
Ethocin
Ethocybin
Iprocin
MET
Miprocin
MIPT
Norbaeocystin
PiPT
Psilocin
Psilocybin;

Dissociatives
NMDAR antagonists

Morphinans: Dextrallorphan
Dextromethorphan
Dextrorphan
Methorphan (Racemethorphan)
Racemorphan;

Deliriants
mAChR antagonists

Miscellaneous

Cannabinoids CB₁R agonists	Cannabinol CP-47,497 CP-55,244 CP-55,940 DMHP HU-210 JWH-018 JWH-030 JWH-073 JWH-081 JWH-200 JWH-250 Nabilone Nabitan Nantradol Parahexyl THC (Dronabinol) WIN-55,212-2

D₂R agonists	Apomorphine Bromocriptine Cabergoline Lisuride Memantine Pergolide Piribedil Pramipexole Ropinirole Rotigotine * Also indirect D₂ agonists such as dopamine reuptake inhibitors (cocaine, methylphenidate), releasing agents (amphetamine, methamphetamine), and precursors (levodopa).

GABA_AR agonists	Eszopiclone Gaboxadol Ibotenic Acid Muscimol Zolpidem Zopiclone

Inhalants Mixed MOA	Butane Chloroform Diethyl Ether (Ether) Enflurane Freon Gasoline (Petrol) Kerosene (Paraffin) Propane Toluene

κOR agonists	2-EMSB 2-MMSB Alazocine Bremazocine Butorphanol Cyclazocine Cyprenorphine Dextrallorphan Dezocine Enadoline Herkinorin HZ-2 Ibogaine Ketazocine Metazocine Nalbuphine Nalorphine Noribogaine Pentazocine Phenazocine Salvinorin A Spiradoline Tifluadom U-50,488 U-69,593

σR agonists	Dextrallorphan Dextromethorphan Dextrorphan Noscapine (Narcotine)

Others	Efavirenz Glaucine Isoaminile

Analgesics (N02A, N02B)

Opioids
See also: Opioids template

Opium & alkaloids thereof	Codeine^# • Morphine^# • Opium • Laudanum • Paregoric

Semi-synthetic opium derivatives	Acetyldihydrocodeine • Benzylmorphine • Buprenorphine • Desomorphine • Dihydrocodeine • Dihydromorphine • Ethylmorphine • Diamorphine • Hydrocodone • Hydromorphinol • Hydromorphone • Nicocodeine • Nicodicodeine • Nicomorphine • Oxycodone • Oxymorphone

Synthetic opioids	Alphaprodine • Anileridine • Butorphanol • Dextromoramide • Dextropropoxyphene • Dezocine • Fentanyl • Ketobemidone • Levorphanol • Methadone • Meptazinol • Nalbuphine • Pentazocine • Propoxyphene • Propiram • Pethidine • Phenazocine • Piminodine • Piritramide • Tapentadol • Tilidine • Tramadol

Pyrazolones

Ampyrone/Aminophenazone • Metamizole • Phenazone • Propyphenazone

Cannabinoids

Ajulemic acid • AM404 • Cannabidiol • Cannabis • Nabilone • Nabiximols • Tetrahydrocannabinol

Anilides

Paracetamol (acetaminophen)^# • Phenacetin • Propacetamol

Non-steroidal
anti-inflammatories
See also: NSAIDs template

Propionic acid class	Fenoprofen • Flurbiprofen • Ibuprofen^# • Ketoprofen • Naproxen • Oxaprozin

Oxicam class	Meloxicam • Piroxicam

Acetic acid class	Diclofenac • Indometacin • Ketorolac • Nabumetone • Sulindac • Tolmetin

COX-2 inhibitors	Celecoxib • Rofecoxib • Valdecoxib • Parecoxib • Lumiracoxib

Anthranilic acid (fenamate) class	Meclofenamate • Mefenamic acid

Salicylates	Aspirin (Acetylsalicylic acid)^# • Benorylate • Diflunisal • Ethenzamide • Magnesium salicylate • Salicin • Salicylamide • Salsalate • Trisalate • Wintergreen (Methyl salicylate)

Atypical, adjuvant and potentiators,
Metabolic agents and miscellaneous

Amitryptiline • Befiradol • Bicifadine • Carisoprodol • Camphor • Cimetidine • Clonidine • Chlorzoxazone • Cyclobenzaprine • Duloxetine • Esreboxetine • Flupirtine • Gabapentin • Glafenine • Hydroxyzine • Ketamine • Menthol • Mephenoxalone • Methocarbamol • Nefopam • Orphenadrine • Pregabalin • Proglumide • Scopolamine • Tebanicline • Trazodone • Gabapentin enacarbil • Ziconotide

^#WHO-EM. ^‡Withdrawn from market. Clinical trials: ^†Phase III. ^§Never to phase III

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)

Anesthetic: General anesthetics (N01A)

Inhalation

Ethers	Diethyl ether • Methoxypropane • Vinyl ether • halogenated ethers (Desflurane • Enflurane • Isoflurane • Methoxyflurane • Sevoflurane)

Haloalkanes	Chloroform • Halothane^# • Trichloroethylene

Others	Cyclopropane • Ethylene • Nitrous oxide^# • Xenon

Injection

Barbiturates	Hexobarbital • Methohexital • Narcobarbital • Thiopental^#

Opioids	Alfentanil • Anileridine • Fentanyl • Phenoperidine • Remifentanil • Sufentanil

Neuroactive steroids	Alfaxalone • Minaxolone

Others	Droperidol • Etomidate • Fospropofol • gamma-Hydroxybutyric acid • Ketamine^# /Esketamine • Midazolam • Propanidid • Propofol

^#WHO-EM. ^‡Withdrawn from market. Clinical trials: ^†Phase III. ^§Never to phase III

M: CNS

anat(n/s/m/p/4/e/b/d/c/a/f/l/g)/phys/devp

noco(m/d/e/h/v/s)/cong/tumr, sysi/epon, injr

proc, drug(N1A/2AB/C/3/4/7A/B/C/D)

Cholinergics

Receptor ligands

mAChR	Agonists: 77-LH-28-1 • AC-42 • AC-260,584 • Aceclidine • Acetylcholine • AF30 • AF150(S) • AF267B • AFDX-384 • Alvameline • AQRA-741 • Arecoline • Bethanechol • Butyrylcholine • Carbachol • CDD-0034 • CDD-0078 • CDD-0097 • CDD-0098 • CDD-0102 • Cevimeline • cis-Dioxolane • Ethoxysebacylcholine • LY-593,039 • L-689,660 • LY-2,033,298 • McNA343 • Methacholine • Milameline • Muscarine • NGX-267 • Ocvimeline • Oxotremorine • PD-151,832 • Pilocarpine • RS86 • Sabcomeline • SDZ 210-086 • Sebacylcholine • Suberylcholine • Talsaclidine • Tazomeline • Thiopilocarpine • Vedaclidine • VU-0029767 • VU-0090157 • VU-0152099 • VU-0152100 • VU-0238429 • WAY-132,983 • Xanomeline • YM-796 Antagonists: 3-Quinuclidinyl Benzilate • 4-DAMP • Aclidinium Bromide • Anisodamine • Anisodine • Atropine • Atropine Methonitrate • Benactyzine • Benzatropine (Benztropine) • Benzydamine • BIBN 99 • Biperiden • Bornaprine • CAR-226,086 • CAR-301,060 • CAR-302,196 • CAR-302,282 • CAR-302,368 • CAR-302,537 • CAR-302,668 • CS-27349 • Cyclobenzaprine • Cyclopentolate • Darifenacin • DAU-5884 • Dimethindene • Dexetimide • DIBD • Dicyclomine (Dicycloverine) • Ditran • EA-3167 • EA-3443 • EA-3580 • EA-3834 • Elemicin • Etanautine • Etybenzatropine (Ethylbenztropine) • Flavoxate • Himbacine • HL-031,120 • Ipratropium bromide • J-104,129 • Hyoscyamine • Mamba Toxin 3 • Mamba Toxin 7 • Mazaticol • Mebeverine • Methoctramine • Metixene • Myristicin • N-Ethyl-3-Piperidyl Benzilate • N-Methyl-3-Piperidyl Benzilate • Orphenadrine • Otenzepad • Oxybutynin • PBID • PD-102,807 • PD-0298029 • Phenglutarimide • Phenyltoloxamine • Pirenzepine • Piroheptine • Procyclidine • Profenamine • RU-47,213 • SCH-57,790 • SCH-72,788 • SCH-217,443 • Scopolamine (Hyoscine) • Solifenacin • Telenzepine • Tiotropium bromide • Tolterodine • Trihexyphenidyl • Tripitamine • Tropatepine • Tropicamide • WIN-2299 • Xanomeline • Zamifenacin; Others: 1st Generation Antihistamines (Brompheniramine, chlorphenamine, cyproheptadine, dimenhydrinate, diphenhydramine, doxylamine, mepyramine/pyrilamine, phenindamine, pheniramine, tripelennamine, triprolidine, etc) • Tricyclic Antidepressants (Amitriptyline, doxepin, trimipramine, etc) • Tetracyclic Antidepressants (Amoxapine, maprotiline, etc) • Typical Antipsychotics (Chlorpromazine, thioridazine, etc) • Atypical Antipsychotics (Clozapine, olanzapine, quetiapine, etc)

nAChR	Agonists: 5-HIAA • A-84,543 • A-366,833 • A-582,941 • A-867,744 • ABT-202 • ABT-418 • ABT-560 • ABT-894 • Acetylcholine • Altinicline • Anabasine • Anatoxin-a • AR-R17779 • Butyrylcholine • Carbachol • Cotinine • Cytisine • Decamethonium • Desformylflustrabromine • Dianicline • Dimethylphenylpiperazinium • Epibatidine • Epiboxidine • Ethanol • Ethoxysebacylcholine • EVP-4473 • EVP-6124 • Galantamine • GTS-21 • Ispronicline • Lobeline • MEM-63,908 (RG-3487) • Nicotine • NS-1738 • PHA-543,613 • PHA-709,829 • PNU-120,596 • PNU-282,987 • Pozanicline • Rivanicline • Sazetidine A • Sebacylcholine • SIB-1508Y • SIB-1553A • SSR-180,711 • Suberylcholine • TC-1698 • TC-1734 • TC-1827 • TC-2216 • TC-5214 • TC-5619 • TC-6683 • Tebanicline • Tropisetron • UB-165 • Varenicline • WAY-317,538 • XY-4083 Antagonists: 18-Methoxycoronaridine • α-Bungarotoxin • α-Conotoxin • Alcuronium • Amantadine • Anatruxonium • Atracurium • Bupropion (Amfebutamone) • Chandonium • Chlorisondamine • Cisatracurium • Coclaurine • Coronaridine • Dacuronium • Decamethonium • Dextromethorphan • Dextropropoxyphene • Dextrorphan • Diadonium • DHβE • Dimethyltubocurarine (Metocurine) • Dipyrandium • Dizocilpine (MK-801) • Doxacurium • Duador • Esketamine • Fazadinium • Gallamine • Hexafluronium • Hexamethonium (Benzohexonium) • Ibogaine • Isoflurane • Ketamine • Kynurenic acid • Laudexium (Laudolissin) • Levacetylmethadol • Malouetine • Mecamylamine • Memantine • Methadone • Methorphan (Racemethorphan) • Methyllycaconitine • Metocurine • Mivacurium • Morphanol (Racemorphanol) • Neramexane • Nitrous Oxide • Pancuronium • Pempidine • Pentamine • Pentolinium • Phencyclidine • Pipecuronium • Radafaxine • Rapacuronium • Rocuronium • Surugatoxin • Suxamethonium (Succinylcholine) • Thiocolchicoside • Toxiferine • Trimethaphan • Tropeinium • Tubocurarine • Vecuronium • Xenon

Reuptake inhibitors

Plasmalemmal

CHT Inhibitors	Hemicholinium-3 (Hemicholine; HC3) • Triethylcholine

Vesicular

VAChT Inhibitors	Vesamicol

Enzyme inhibitors

Anabolism

ChAT inhibitors	1-(-Benzoylethyl)pyridinium • 2-(α-Naphthoyl)ethyltrimethylammonium • 3-Chloro-4-stillbazole • 4-(1-Naphthylvinyl)pyridine • Acetylseco hemicholinium-3 • Acryloylcholine • AF64A • B115 • BETA • CM-54,903 • N,N-Dimethylaminoethylacrylate • N,N-Dimethylaminoethylchloroacetate

Catabolism

AChE inhibitors	Reversible: Carbamates: Aldicarb • Bendiocarb • Bufencarb • Carbaryl • Carbendazim • Carbetamide • Carbofuran • Chlorbufam • Chloropropham • Ethienocarb • Ethiofencarb • Fenobucarb • Fenoxycarb • Formetanate • Furadan • Ladostigil • Methiocarb • Methomyl • Miotine • Oxamyl • Phenmedipham • Pinmicarb • Pirimicarb • Propamocarb • Propham • Propoxur; Stigmines: Ganstigmine • Neostigmine • Phenserine • Physostigmine • Pyridostigmine • Rivastigmine; Others: Acotiamide • Ambenonium • Donepezil • Edrophonium • Galantamine • Huperzine A • Minaprine • Tacrine • Zanapezil Irreversible: Organophosphates: Acephate • Azinphos-methyl • Bensulide • Cadusafos • Chlorethoxyfos • Chlorfenvinphos • Chlorpyrifos • Chlorpyrifos-Methyl • Coumaphos • Cyclosarin (GF) • Demeton • Demeton-S-Methyl • Diazinon • Dichlorvos • Dicrotophos • Diisopropyl fluorophosphate (Guthion) • Diisopropylphosphate • Dimethoate • Dioxathion • Disulfoton • EA-3148 • Echothiophate • Ethion • Ethoprop • Fenamiphos • Fenitrothion • Fenthion • Fosthiazate • GV • Isofluorophate • Isoxathion • Malaoxon • Malathion • Methamidophos • Methidathion • Metrifonate • Mevinphos • Monocrotophos • Naled • Novichok agent • Omethoate • Oxydemeton-Methyl • Paraoxon • Parathion • Parathion-Methyl • Phorate • Phosalone • Phosmet • Phostebupirim • Phoxim • Pirimiphos-Methyl • Sarin (GB) • Soman (GD) • Tabun (GA) • Temefos • Terbufos • Tetrachlorvinphos • Tribufos • Trichlorfon • VE • VG • VM • VR • VX; Others: Demecarium • Onchidal (Onchidella binneyi)

BChE inhibitors	Cymserine * Many of the acetylcholinesterase inhibitors listed above act as butyrylcholinesterase inhibitors.

Others

Precursors	Choline (Lecithin) • Citicoline • Cyprodenate • Dimethylethanolamine (DMAE, deanol) • Glycerophosphocholine • Meclofenoxate (Centrophenoxine) • Phosphatidylcholine • Phosphatidylethanolamine • Phosphorylcholine • Pirisudanol

Cofactors	Acetic acid • Acetylcarnitine • Acetyl-coA • Vitamin B₅ (Pantethine, Pantetheine, Panthenol)

Others	Acetylcholine releasing agents: α-Latrotoxin • β-Bungarotoxin; Acetylcholine release inhibitors: Botulinum toxin (Botox); Acetylcholinesterase reactivators: Asoxime • Obidoxime • Pralidoxime

Glutamatergics

Ionotropic

AMPA	Agonists: 5-Fluorowillardiine • AMPA • Domoic acid • Quisqualic acid; Positive allosteric modulators: Aniracetam • Cyclothiazide • CX-516 • CX-546 • CX-614 • CX-691 • CX-717 • Diazoxide • HCTZ • IDRA-21 • LY-392,098 • LY-404,187 • LY-451,395 • LY-451,646 • LY-503,430 • Org 26576 • Oxiracetam • PEPA • Piracetam • Pramiracetam • S-18986 • Sunifiram • Unifiram Antagonists: ATPO • Barbiturates • Caroverine • CNQX • DNQX • GYKI-52466 • NBQX • Perampanel • Talampanel • Tezampanel • Topiramate; Negative allosteric modulators: GYKI-53,655

NMDA	Agonists: Glutamate/acite site competitive agonists: Aspartate • Glutamate • Homoquinolinic acid • Ibotenic acid • NMDA • Quinolinic acid • Tetrazolylglycine; Glycine site agonists: ACBD • ACPC • ACPD • Alanine • CCG • Cycloserine • DHPG • Fluoroalanine • Glycine • HA-966 • L-687,414 • Milacemide • Sarcosine • Serine • Tetrazolylglycine; Polyamine site agonists: Acamprosate • Spermidine • Spermine Antagonists: Competitive antagonists: AP5 (APV) • AP7 • CGP-37849 • CGP-39551 • CGP-39653 • CGP-40116 • CGS-19755 • CPP • LY-233,053 • LY-235,959 • LY-274,614 • MDL-100,453 • Midafotel (d-CPPene) • NPC-12,626 • NPC-17,742 • PBPD • PEAQX • Perzinfotel • PPDA • SDZ-220581 • Selfotel; Noncompetitive antagonists: ARR-15,896 • Caroverine • Dexanabinol • FPL-12495 • FR-115,427 • Hodgkinsine • Magnesium • MDL-27,266 • NPS-1506 • Psychotridine • Zinc; Uncompetitive pore blockers: 2-MDP • 3-MeO-PCP • 8A-PDHQ • Alaproclate • Amantadine • Aptiganel • ARL-12,495 • ARL-15,896-AR • ARL-16,247 • Budipine • Delucemine • Dexoxadrol • Dextrallorphan • Dieticyclidine • Dizocilpine • Endopsychosin • Esketamine • Etoxadrol • Eticyclidine • Gacyclidine • Ibogaine • Indantadol • Ketamine • Ketobemidone • Loperamide • Memantine • Meperidine (Pethidine) • Methadone • Methorphan (Dextromethorphan, Levomethorphan) • Methoxetamine • Milnacipran • Morphanol (Dextrorphan, Levorphanol) • NEFA • Neramexane • Nitrous oxide • Noribogaine • Orphenadrine • PCPr • Phencyclamine • Phencyclidine • Propoxyphene • Remacemide • Rhynchophylline • Riluzole • Rimantadine • Rolicyclidine • Sabeluzole • Tenocyclidine • Tiletamine • Tramadol • Xenon; Glycine site antagonists: ACEA-1021 • ACEA-1328 • ACPC • Carisoprodol • CGP-39653 • CKA • DCKA • Felbamate • Gavestinel • GV-196,771 • Kynurenic acid • L-689,560 • L-701,324 • Lacosamide • Licostinel • LU-73,068 • MDL-105,519 • Meprobamate • MRZ 2/576 • PNQX • ZD-9379; NR2B subunit antagonists: Besonprodil • CO-101,244 (PD-174,494) • CP-101,606 • Eliprodil • Haloperidol • Ifenprodil • Isoxsuprine • Nylidrin • Ro8-4304 • Ro25-6981 • Traxoprodil; Polyamine site antagonists: Arcaine • Co 101676 • Diaminopropane • Acamprosate • Diethylenetriamine • Huperzine A • Putrescine • Ro 25-6981; Unclassified/unsorted antagonists: Chloroform • Diethyl ether • Enflurane • Ethanol (Alcohol) • Halothane • Isoflurane • Methoxyflurane • Toluene • Trichloroethane • Trichloroethanol • Trichloroethylene • Xylene

Kainate	Agonists: 5-Iodowillardiine • ATPA • Domoic acid • Kainic acid • LY-339,434 • SYM-2081 Antagonists: CNQX • DNQX • LY-382,884 • NBQX • NS102 • Tezampanel • Topiramate • UBP-302; Negative allosteric modulators: NS-3763

Metabotropic

Group I	Agonists: Unselective: ACPD • DHPG • Quisqualic acid; mGlu1-selective: Ro01-6128 • Ro67-4853 • Ro67-7476 • VU-71; mGlu5-selective: ADX-47273 • CDPPB • CHPG • DFB • VU-1545 Antagonists: Unselective: MCPG • NPS-2390; mGlu1-selective: BAY 36-7620 • CPCCOEt • LY-367,385 • LY-456,236; mGlu5-selective: Dipraglurant • DMeOB • Fenobam • LY-344,545 • MPEP • MTEP • SIB-1757 • SIB-1893

Group II	Agonists: Unselective: CBiPES • DCG-IV • Eglumegad • LY-379,268 • LY-404,039 • LY-487,379 • MGS-0028; mGlu2-selective: BINA • LY-566,332 Antagonists: Unselective: APICA • EGLU • HYDIA • LY-307,452 • LY-341,495 • MCPG • MGS-0039: mGlu2-selective: PCCG-4; mGlu3-selective: CECXG

Group III	Agonists: Unselective: L-AP4; mGlu4-selective: PHCCC • VU-001,171 • VU-0155,041; mGlu7-selective: AMN082; mGlu8-selective: DCPG Antagonists: Unselective: CPPG • MAP4 • MSOP • MPPG • MTPG • UBP-1112; mGlu7-selective: MMPIP

Transporter
inhibitors

EAATs	DHKA • PDC • WAY-213,613

vGluTs	7-CKA • Evans blue

Serotonergics

5-HT₁ receptor ligands

5-HT_1A	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 • Bay R 1531 • 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 • Xylamidine

5-HT_1B	Agonists: 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 • Yohimbine

5-HT_1D	Agonists: 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 • Ziprasidone

5-HT_1E	Agonists: Lysergamides: Methysergide; Triptans: Eletriptan; Tryptamines: BRL-54443 • Tryptamine Antagonists: Metitepine/Methiothepin

5-HT_1F	Agonists: Triptans: Eletriptan • Naratriptan • Sumatriptan; Tryptamines: 5-MT; Others: BRL-54443 • Lasmiditan • LY-334,370 Antagonists: Metitepine/Methiothepin

5-HT₂ receptor ligands


5-HT_2A	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 • Clorotepine • 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 • 5-MeO-NBpBrT • 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 • Yohimbine

5-HT_2B	Agonists: 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 • Yohimbine

5-HT_2C	Agonists: 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: Clorotepine • 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 • Xylamidine

5-HT₃, 5-HT₄, 5-HT₅, 5-HT₆, 5-HT₇ ligands


5-HT₃	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 • Xenon

5-HT₄	Agonists: 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-204,070

5-HT_5A	Agonists: Lysergamides: Ergotamine • LSD; Tryptamines: 5-CT; Others: Valerenic Acid Antagonists: Asenapine • Latrepirdine • Metitepine/Methiothepin • Ritanserin • SB-699,551 * Note that the 5-HT_5B receptor is not functional in humans.

5-HT₆	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 • N-Methyl-5-HT • Tryptamine; Others: WAY-181,187 • WAY-208,466 Antagonists: Antidepressants: Amitriptyline • Amoxapine • Clomipramine • Doxepin • Mianserin • Nortriptyline; Atypical antipsychotics: Aripiprazole • Asenapine • Clorotepine • 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-742,457

5-HT₇	Agonists: 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 • Clorotepine • 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 • Vortioxetine

Reuptake inhibitors

SERT	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 • Ziprasidone

VMAT	Ibogaine • Reserpine • Tetrabenazine

Releasing 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 • Viqualine

Enzyme inhibitors

Anabolism

TPH	AGN-2979 • Fenclonine

AAAD	Benserazide • Carbidopa • Genistein • Methyldopa

Catabolism

MAO

Nonselective: 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 • Tyrima

Others

Precursors	L-Tryptophan → 5-HTP

Cofactors	Ferrous 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⁺)

Others	Activity enhancers: BPAP • PPAP; Reuptake enhancers: Tianeptine