THENALIDINE MALEATE

US Previously Marketed

First approved in 1956

Details

Stereochemistry	ACHIRAL
Molecular Formula	C17H22N2S.C4H4O4
Molecular Weight	402.507
Optical Activity	NONE
Defined Stereocenters	0 / 0
E/Z Centers	1
Charge	0

SHOW SMILES / InChI

Structure Search

SMILES

OC(=O)\C=C/C(O)=O.CN1CCC(CC1)N(CC2=CC=CS2)C3=CC=CC=C3

InChI

InChIKey=OYCQNZCKQWGYBZ-BTJKTKAUSA-N

InChI=1S/C17H22N2S.C4H4O4/c1-18-11-9-16(10-12-18)19(14-17-8-5-13-20-17)15-6-3-2-4-7-15;5-3(6)1-2-4(7)8/h2-8,13,16H,9-12,14H2,1H3;1-2H,(H,5,6)(H,7,8)/b;2-1-

HIDE SMILES / InChI

Molecular Formula	C4H4O4
Molecular Weight	116.0722
Charge	0
Count

Stereochemistry	ACHIRAL
Additional Stereochemistry	No
Defined Stereocenters	0 / 0
E/Z Centers	1
Optical Activity	NONE

Molecular Formula	C17H22N2S
Molecular Weight	286.435
Charge	0
Count

Stereochemistry	ACHIRAL
Additional Stereochemistry	No
Defined Stereocenters	0 / 0
E/Z Centers	0
Optical Activity	NONE

Description
Sources: https://www.ncbi.nlm.nih.gov/pubmed/6266359
Curator's Comment: Description was created based on several sources, including http://www.drugbank.ca/drugs/DB04826 http://www.un.org/esa/coordination/CL12.pdf

Thenalidine is an antihistamine with anticholinergic properties used as an antipruritic drug. It was withdrawn from the US, Canadian, and UK markets due to a risk of neutropenia. Thenalidine is an antagonist of the H1-receptor.

CNS Activity

Approval Year

Targets

Primary Target	Pharmacology	Condition	Potency
Histamine H1 receptor 316 Target ID: CHEMBL231 Sources: https://www.ncbi.nlm.nih.gov/pubmed/6266359 \| http://www.genome.jp/dbget-bin/www_bget?drug+D07194	Antagonist 2849

Conditions

Condition	Modality	Targets	Highest Phase	Product
Atopic dermatitis 64 Sources: https://www.ncbi.nlm.nih.gov/pubmed/13573282	Primary		Approved 8583	Sandostene Approved Use for the management of dermatologic and allergic conditions Launch Date 1952

Doses

Dose	Population	Adverse events
25 mg 3 times / day multiple, oral Dose: 25 mg, 3 times / day Route: oral Route: multiple Dose: 25 mg, 3 times / day Sources: https://pubmed.ncbi.nlm.nih.gov/13762246 https://pubmed.ncbi.nlm.nih.gov/13917095	unhealthy, 41 years Health Status: unhealthy Age Group: 41 years Sex: M Sources: https://pubmed.ncbi.nlm.nih.gov/13762246 https://pubmed.ncbi.nlm.nih.gov/13917095	Disc. AE: Agranulocytosis... AEs leading to discontinuation/dose reduction: Agranulocytosis (grade 5) Sources: https://pubmed.ncbi.nlm.nih.gov/13762246 https://pubmed.ncbi.nlm.nih.gov/13917095

AEs

AE	Significance	Dose	Population
Agranulocytosis	grade 5 Disc. AE	25 mg 3 times / day multiple, oral Dose: 25 mg, 3 times / day Route: oral Route: multiple Dose: 25 mg, 3 times / day Sources: https://pubmed.ncbi.nlm.nih.gov/13762246 https://pubmed.ncbi.nlm.nih.gov/13917095	unhealthy, 41 years Health Status: unhealthy Age Group: 41 years Sex: M Sources: https://pubmed.ncbi.nlm.nih.gov/13762246 https://pubmed.ncbi.nlm.nih.gov/13917095

Sourcing

Vendor/Aggregator	ID	URL
001 Chemical	DY575262	https://www.001chemical.com/chem/86-12-4
ABI Chem	AC1L1E77
Alfa Chemistry	86-12-4	https://www.alfa-chemistry.com/cas_86-12-4.htm
Chemieliva Pharmaceutical Co., Ltd	PBCM0000229
ChemMol	99169221	http://www.chemmol.com/chemmol/99169221.html
Clearsynth	CS-T-86728	https://www.clearsynth.com/en/CST86728.html
Compound Cloud	27901
Molcore	MC575262	https://www.molcore.com/product/86-12-4
MuseChem	R027335
Norris Pharm	NSZB-A064135
NovoSeek	27901
Smolecule	S545158	http://www.smolecule.com/products/s545158
THE BioTek	bt-284248	https://www.thebiotek.com/product/inhibitors/bt-284248
Toronto Research Chemicals	T343000
ZINC	ZINC000000002146	http://zinc15.docking.org/substances/ZINC000000002146

PubMed

Title	Date	PubMed
The effect of antihistaminics on cataleptogenic action of analgesics and haloperidol.	1983	6141553

Patents

Sample Use Guides

In Vivo Use Guide

Thenalidine was given in coated tablets, each containing 25 mg. of the active ingredient. The initial dosage was 2 tablets 4 times a day until the patient improved, or for at least one week. The maintenance dose varied between 3 and 6 tablets daily, 4 tablets daily being the average. Intravenous injection of 10 ml. of thenalidine tartrate plus calcium (50 mg. of Sandostene and 1.375 g. of calcium gluconogalactogluconate) was given in a few severe and acute cases only.

Route of Administration: Other

In Vitro Use Guide

Unknown

Substance Class	Chemical Created by `admin` on `Mon Mar 31 22:10:51 GMT 2025` Edited by `admin` on `Mon Mar 31 22:10:51 GMT 2025`
Record UNII	YYO25I8VV7
Record Status	`Validated (UNII)`
Record Version

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Name

Type

Language

THENALIDINE MALEATE

Common Name

English

THENALIDINE HYDROGEN MALEATE

Preferred Name

English

4-PIPERIDINAMINE, 1-METHYL-N-PHENYL-N-(2-THIENYLMETHYL)-, (2Z)-2-BUTENEDIOATE (1:1)

Systematic Name

English

4-PIPERIDINAMINE, 1-METHYL-N-PHENYL-N-(2-THIENYLMETHYL)-, (Z)-2-BUTENEDIOATE (1:1)

Systematic Name

English

Thenalidine maleate [WHO-DD]

Common Name

English

Code System Code Type Description

FDA UNII

YYO25I8VV7