Hydroxyethylpromethazine

Last updated April 20, 2025

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Hydroxyethylpromethazine
Clinical data

ATC code	R06AD05 ( WHO )
Identifiers
IUPAC name N-(2-hydroxyethyl)-N,N-dimethyl-1-(10H- phenothiazin-10-yl)propan-2-aminium
CAS Number	7647-63-4
PubChem CID	16406
ChemSpider	15559 ^Y
UNII	571559SLAJ
CompTox Dashboard (EPA)	DTXSID30871861
Chemical and physical data
Formula	C₁₉H₂₅N₂OS⁺
Molar mass	329.48 g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES OCC[N+](C)(C)C(C)CN1c3c(Sc2c1cccc2)cccc3
InChI InChI=1S/C19H25N2OS/c1-15(21(2,3)12-13-22)14-20-16-8-4-6-10-18(16)23-19-11-7-5-9-17(19)20/h4-11,15,22H,12-14H2,1-3H3/q+1^Y Key:PDSVTRQOBUIQBQ-UHFFFAOYSA-N^Y
(verify)

Hydroxyethylpromethazine is an antihistamine with anticholinergic properties. It is structurally analogous to promethazine.^[1]

References

↑ "NCATS Inxight Drugs — PROMETHAZINE HYDROXYETHYL". drugs.ncats.io. Retrieved 2025-04-18.

v t e Antihistamines (R06)
Benzimidazoles (*)	Astemizole Azelastine Bilastine Emedastine Mizolastine Talastine
Diarylmethanes	Diarylmethoxyalkylamines: Bromazine (bromodiphenhydramine) Carbinoxamine Chlorphenoxamine Clemastine Diphenhydramine (+naproxen) Diphenylpyraline Doxylamine Ebastine Orphenadrine Diphenylmethanolpiperidines : Fexofenadine Terfenadine Diphenylmethylpiperazines : Buclizine Cetirizine Levocetirizine Chlorcyclizine Cinnarizine Cyclizine Etodroxizine Hydroxyzine Meclizine Oxatomide Phenylpyridinylpropanamines: Brompheniramine Chlorphenamine Dexbrompheniramine (+pseudoephedrine) Dexchlorpheniramine (+betamethasone) Pheniramine Others: Acrivastine Bamipine Dimetindene Phenyltoloxamine Pyrrobutamine Quifenadine Triprolidine
Ethylenediamines	Antazoline Chloropyramine Histapyrrodine Mepyramine (pyrilamine) Methapyrilene Phenbenzamine Thenalidine Tripelennamine (pyribenzamine)
Tricyclics	Dibenzocycloheptenes : Antidepressants (e.g., amitriptyline) Azatadine Cyproheptadine Deptropine Desloratadine Ketotifen Loratadine Rupatadine Phenothiazines : Alimemazine Fenethazine Hydroxyethylpromethazine Isothipendyl Mequitazine Methdilazine Oxomemazine Promethazine Others: Antidepressants (e.g., doxepin, mirtazapine, trimipramine) Epinastine Latrepirdine Mebhydrolin Olopatadine Perlapine Phenindamine Pimethixene
Others	Phenylpiperazines: Antidepressants (e.g., trazodone) Phenbenzamine
For topical use	Bamipine Chloropyramine Chlorphenoxamine Clemastine Dimetindene Diphenhydramine Doxepin Isothipendyl Mepyramine (pyrilamine) Promethazine

Histamine receptor modulators

H₁

Agonists

Antagonists

Others: Atypical antipsychotics (e.g., aripiprazole, asenapine, brexpiprazole, brilaroxazine, clozapine, iloperidone, olanzapine, paliperidone, quetiapine, risperidone, ziprasidone, zotepine)
Phenylpiperazine antidepressants (e.g., hydroxynefazodone, nefazodone, trazodone, triazoledione)
Tetracyclic antidepressants (e.g., amoxapine, loxapine, maprotiline, mianserin, mirtazapine, oxaprotiline)
Tricyclic antidepressants (e.g., amitriptyline, butriptyline, clomipramine, desipramine, dosulepin (dothiepin), doxepin, imipramine, iprindole, lofepramine, nortriptyline, protriptyline, trimipramine)
Typical antipsychotics (e.g., chlorpromazine, flupenthixol, fluphenazine, loxapine, perphenazine, prochlorperazine, thioridazine, thiothixene)

Unknown/unsorted: Azanator
Belarizine
Elbanizine
Flotrenizine
GSK1004723
Napactadine
Tagorizine
Trelnarizine
Trenizine

H₂

Agonists	Amthamine Betazole Dimaprit Histamine HTMT Impromidine L-Histidine UR-AK49
Antagonists	Bisfentidine Burimamide Cimetidine Dalcotidine Donetidine Ebrotidine Etintidine Famotidine Isolamtidine Lafutidine Lamtidine Lavoltidine (loxtidine) Lupitidine Metiamide Mifentidine Niperotidine Nizatidine Osutidine Oxmetidine Pibutidine Quisultazine (quisultidine) Ramixotidine Ranitidine Roxatidine Sufotidine Tiotidine Tuvatidine Venritidine Xaltidine Zolantidine

H₃

Agonists	α-Methylhistamine Cipralisant Histamine Imetit Immepip Immethridine L-Histidine Methimepip Proxyfan
Antagonists	A-349821 A-423579 ABT-239 ABT-652 AZD5213 Bavisant Betahistine Burimamide Ciproxifan Clobenpropit Conessine Enerisant GSK-189254 Impentamine Iodophenpropit Irdabisant JNJ-5207852 NNC 38-1049 PF-03654746 Pitolisant SCH-79687 Thioperamide VUF-5681

H₄

Agonists	4-Methylhistamine α-Methylhistamine Histamine L-Histidine OUP-16 VUF-8430
Antagonists	JNJ-7777120 Mianserin Seliforant Thioperamide Toreforant VUF-6002

See also: Receptor/signaling modulators; Monoamine metabolism modulators; Monoamine reuptake inhibitors

Muscarinic acetylcholine receptor modulators

mAChRs

Agonists

Antagonists

Precursors
(and prodrugs)

See also: Receptor/signaling modulators; Nicotinic acetylcholine receptor modulators; Acetylcholine metabolism/transport modulators

v t e Tricyclics
Classes	Acridine Anthracene Dibenzazepine Dibenzocycloheptene Dibenzodiazepine Dibenzothiazepine Dibenzothiepin Dibenzoxazepine Dibenzoxepin Phenothiazine Pyridazinobenzoxazine Pyridinobenzodiazepine Thioxanthene
Antidepressants (Tricyclic antidepressants (TCAs))	Amoxapine Amezepine Amineptine Amitriptyline Amitriptylinoxide Amoxapine Aptazapine Azepindole Batelapine Beloxepin Butriptyline Cianopramine Ciclazindol Cidoxepin Clomipramine Cotriptyline Cyanodothiepin Demexiptiline Depramine (balipramine) Desipramine (desmethylimipramine) Desmethylclomipramine Desmethyltrimipramine Dibenzepin Dimetacrine Dosulepin (dothiepin) Doxepin Enprazepine Fantridone Fluotracen Hepzidine Homopipramol Imipramine Imipraminoxide Intriptyline Iprindole Ketipramine Litracen Lofepramine Losindole Loxapine Maprotiline Mariptiline Mazindol Melitracen Metapramine Mezepine Mirtazapine Monometacrine Nitroxazepine Norbutriptyline Nordoxepin Northiaden (nordosulepin) Nortriptyline (noramitriptyline) Noxiptiline Octriptyline Opipramol Pipofezine Pirandamine Propizepine Protriptyline Quinupramine Spiroxepin Tandamine Tampramine Tianeptine Tienopramine Trimipramine
Antihistamines	Azatadine Bisulepin Cidoxepin Clobenzepam Cyproheptadine Dacemazine Deptropine Desloratadine Epinastine Etymemazine Fenethazine Hydroxyethylpromethazine Isopromethazine Isothipendyl Ketotifen Latrepirdine Loratadine Mebhydrolin Mequitazine Methdilazine Olopatadine Oxomemazine Perlapine Phenindamine Pimethixene Pirolate Promethazine Propiomazine Rupatadine Thiazinamium
Antipsychotics	Acetophenazine Alimemazine Amoxapine Asenapine Butaclamol Butaperazine Carfenazine (carphenazine) Carpipramine Chlorpromazine Chlorprothixene Ciclindole Citatepine Clocapramine Clomacran Clorotepine Clotiapine Clozapine Cyanothepin Doclothepin Docloxythepin Erizepine Flucindole Flumezapine Fluotracen Flupentixol Fluphenazine Gevotroline Homopipramol Isofloxythepin Levomepromazine/Methotrimeprazine Loxapine Maroxepin Meperathiepin Mesoridazine Metiapine Metitepine Metoxepin Mosapramine Naranol Octomethothepin Olanzapine Oxyclothepin Oxyprothepin Pentiapine Peradithiepin Perathiepin Perazine Perphenazine Periciazine Pinoxepin Piperacetazine Pipotiazine Piquindone Prochlorperazine Promazine Prothipendyl Quetiapine Savoxepin/Cipazoxapine Sulforidazine Tenilapine Thiethylperazine Thiopropazate Thioridazine Thiothixene Tilozepine Traboxopine Trifluoperazine Triflupromazine Trifluthepin Zotepine Zuclopenthixol
Anticonvulsants	Carbamazepine Dizocilpine Eslicarbazepine Eslicarbazepine acetate Etazepine Licarbazepine Oxcarbazepine Oxitriptyline
Anticholinergics	Darenzepine Dipitramine Nuvenzepine Pirenzepine Profenamine Rispenzepine Siltenzepine Telenzepine Tripitramine Tropatepine Zolenzepine
Others	Adosopine Aminopromazine Atiprosin Benzoctamine Botiacrine Carvedilol Cyclobenzaprine Damotepine Elanzepine Fluradoline Methylene blue Monatepil Oxetorone Pipazethate P7C3 Pinadoline Pitrazepin Pizotifen Serazapine Tipindole

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Hydroxyethylpromethazine

See also

References