CLEMASTINE

Details

Stereochemistry	ABSOLUTE
Molecular Formula	C21H26ClNO
Molecular Weight	343.89
Optical Activity	UNSPECIFIED
Defined Stereocenters	2 / 2
E/Z Centers	0
Charge	0

SHOW SMILES / InChI

Structure Search

SMILES

CN1CCC[C@@H]1CCO[C@](C)(C2=CC=CC=C2)C3=CC=C(Cl)C=C3

InChI

InChIKey=YNNUSGIPVFPVBX-NHCUHLMSSA-N

InChI=1S/C21H26ClNO/c1-21(17-7-4-3-5-8-17,18-10-12-19(22)13-11-18)24-16-14-20-9-6-15-23(20)2/h3-5,7-8,10-13,20H,6,9,14-16H2,1-2H3/t20-,21-/m1/s1

HIDE SMILES / InChI

Molecular Formula	C21H26ClNO
Molecular Weight	343.89
Charge	0
Count

Stereochemistry	ABSOLUTE
Additional Stereochemistry	No
Defined Stereocenters	2 / 2
E/Z Centers	0
Optical Activity	UNSPECIFIED

Description
Sources: http://www.drugbank.ca/drugs/DB00283
Curator's Comment: Description was created based on several sources, including http://www.sciencedirect.com/topics/page/Clemastine and https://www.drugs.com/pro/clemastine.html

Clemastine is an antihistamine with anticholinergic (drying) and sedative side effects. Clemastine is a selective histamine H1 antagonist and binds to the histamine H1 receptor. This blocks the action of endogenous histamine, which subsequently leads to temporary relief of the negative symptoms brought on by histamine. It is used for the relief of symptoms associated with allergic rhinitis such as sneezing, rhinorrhea, pruritus and acrimation. Also for the management of mild, uncomplicated allergic skin manifestations of urticaria and angioedema. Used as self-medication for temporary relief of symptoms associated with the common cold.

CNS Activity

Originator

Approval Year

Targets

Primary Target	Pharmacology	Potency
Trypanosoma cruzi 12 Target ID: CHEMBL368 Sources: https://www.ncbi.nlm.nih.gov/pubmed/25033456	Inhibitor 8504	0.4 µM [IC50]
HERG 99 Target ID: CHEMBL240 Sources: https://www.ncbi.nlm.nih.gov/pubmed/16288909	Inhibitor 8504	12.0 nM [IC50]
Cytochrome P450 2D6 62 Target ID: CHEMBL289 Sources: https://www.ncbi.nlm.nih.gov/pubmed/9616188	Inhibitor 8504	2.0 µM [Ki]
Histamine H1 receptor 316 Target ID: CHEMBL231 Sources: http://www.drugbank.ca/drugs/DB00283	Antagonist 2849

Conditions

Condition	Modality	Targets	Highest Phase	Product
Allergic rhinitis 104 Sources: https://www.drugs.com/pro/clemastine.html	Primary		Approved 8583	CLEMASTINE Approved Use Clemastine fumarate tablets are indicated for the relief of symptoms associated with allergic rhinitis such as sneezing, rhinorrhea, pruritus, and lacrimation. Clemastine fumarate tablets are also indicated for the relief of mild, uncomplicated allergic skin manifestations of urticaria and angioedema. Launch Date 1992
Urticaria 39 Sources: https://www.drugs.com/pro/clemastine.html	Primary		Approved 8583	CLEMASTINE Approved Use Clemastine fumarate tablets are indicated for the relief of symptoms associated with allergic rhinitis such as sneezing, rhinorrhea, pruritus, and lacrimation. Clemastine fumarate tablets are also indicated for the relief of mild, uncomplicated allergic skin manifestations of urticaria and angioedema. Launch Date 1992

C_max

Value	Dose	Analyte	Population
0.7 ng/mL EXPERIMENT https://pubmed.ncbi.nlm.nih.gov/15664345/	3 mg single, oral dose: 3 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: UNKNOWN
650 pg/mL DRUG LABEL https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_biopharmr.pdf	0.5 mg single, oral dose: 0.5 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: FEMALE / MALE food status: FASTED
1010 pg/mL DRUG LABEL https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_biopharmr.pdf	1 mg single, oral dose: 1 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: FASTED

AUC

Value	Dose	Analyte	Population
4.2 ng × h/mL EXPERIMENT https://pubmed.ncbi.nlm.nih.gov/15664345/	3 mg single, oral dose: 3 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: UNKNOWN
15529 pg × h/mL DRUG LABEL https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_biopharmr.pdf	0.5 mg single, oral dose: 0.5 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: FEMALE / MALE food status: FASTED
26230 pg × h/mL DRUG LABEL https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_biopharmr.pdf	1 mg single, oral dose: 1 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: FASTED

T_1/2

Value	Dose	Analyte	Population
8 h EXPERIMENT https://pubmed.ncbi.nlm.nih.gov/15664345/	3 mg single, oral dose: 3 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: UNKNOWN
17.28 h DRUG LABEL https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_biopharmr.pdf	0.5 mg single, oral dose: 0.5 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: FEMALE / MALE food status: FASTED
23.94 h DRUG LABEL https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_biopharmr.pdf	1 mg single, oral dose: 1 mg route of administration: Oral experiment type: SINGLE co-administered:	CLEMASTINE plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: FASTED

Doses

Dose	Population	Adverse events
4 mg single, oral Highest studied dose Dose: 4 mg Route: oral Route: single Dose: 4 mg Sources: https://pubmed.ncbi.nlm.nih.gov/8930778	healthy Health Status: healthy Sex: M Sources: https://pubmed.ncbi.nlm.nih.gov/8930778	Sources: https://pubmed.ncbi.nlm.nih.gov/8930778
0.5 mg single, oral Dose: 0.5 mg Route: oral Route: single Dose: 0.5 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M+F Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	Disc. AE: Itching, Rash... AEs leading to discontinuation/dose reduction: Itching (1 patient) Rash (1 patient) Nausea (1 patient) Pallor (1 patient) Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf
1 mg single, oral Dose: 1 mg Route: oral Route: single Dose: 1 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	Disc. AE: Vomiting... AEs leading to discontinuation/dose reduction: Vomiting (1 patient) Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf

AEs

AE	Significance	Dose	Population
Itching	1 patient Disc. AE	0.5 mg single, oral Dose: 0.5 mg Route: oral Route: single Dose: 0.5 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M+F Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf
Nausea	1 patient Disc. AE	0.5 mg single, oral Dose: 0.5 mg Route: oral Route: single Dose: 0.5 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M+F Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf
Pallor	1 patient Disc. AE	0.5 mg single, oral Dose: 0.5 mg Route: oral Route: single Dose: 0.5 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M+F Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf
Rash	1 patient Disc. AE	0.5 mg single, oral Dose: 0.5 mg Route: oral Route: single Dose: 0.5 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M+F Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf
Vomiting	1 patient Disc. AE	1 mg single, oral Dose: 1 mg Route: oral Route: single Dose: 1 mg Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf	healthy Health Status: healthy Sex: M Sources: https://www.accessdata.fda.gov/drugsatfda_docs/nda/2001/21-082_Tavist_medr_P2.pdf

Overview

CYP3A4	CYP2C9	CYP2D6	hERG
		inhibitor 2507	inhibitor 2217

OverviewOther

Other Inhibitor	Other Substrate	Other Inducer
P-gp 1741

Drug as perpetrator

Target	Modality	Activity	Metabolite	Clinical evidence
CYP2D6 2546	inhibitor 4027 Sources: https://pubmed.ncbi.nlm.nih.gov/9616188/	yes [Ki 2 uM]
P-gp 1932	inhibitor 4027 Sources: https://pubmed.ncbi.nlm.nih.gov/27279987/	yes

Tox targets

Target	Modality	Activity	Metabolite	Clinical evidence
hERG 2263	inhibitor 2237 Sources: https://pubmed.ncbi.nlm.nih.gov/16288909/

Sourcing

Vendor/Aggregator	ID	URL
ChEBI	CHEBI:3738	https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:3738
ChemicalBook	CB3376056	https://www.chemicalbook.com/ChemicalProductProperty_EN_CB3376056
ZINC	ZINC000000402830	http://zinc15.docking.org/substances/ZINC000000402830

PubMed

Title	Date	PubMed
Development of a list of potentially inappropriate drugs for the korean elderly using the delphi method.	2010-12	21818443
Diagnostic approach identifying hydroxyethyl starch (HES) triggering a severe anaphylactic reaction during anesthesia in a 15-year-old boy.	2010-12	20556705
Treatment of locally advanced carcinomas of head and neck with intensity-modulated radiation therapy (IMRT) in combination with cetuximab and chemotherapy: the REACH protocol.	2010-11-26	21108850
A Phase Ib dose-escalation study to evaluate safety and tolerability of the addition of the aminopeptidase inhibitor tosedostat (CHR-2797) to paclitaxel in patients with advanced solid tumours.	2010-10-26	20877350
[Progress of study on antitumor effects of antibody dependent cell mediated cytotoxicity--review].	2010-10	21129296
Therapeutic efficacy of icatibant in angioedema induced by angiotensin-converting enzyme inhibitors: a case series.	2010-09	20447725
Hyperimmune anti-HBs plasma as alternative to commercial immunoglobulins for prevention of HBV recurrence after liver transplantation.	2010-07-04	20598161
[Discriminant function analysis in the assessment of laboratory test data in the correction of traditional therapy for mild icteric form of viral hepatitis B in children with food allergy].	2010-06	20734860
Structural elucidation of N-oxidized clemastine metabolites by liquid chromatography/tandem mass spectrometry and the use of Cunninghamella elegans to facilitate drug metabolite identification.	2010-05-30	20411584
Synthesis of (-)-(S,S)-clemastine by invertive N --> C aryl migration in a lithiated carbamate.	2010-05-21	20405879
Chloroquine-induced Pruritus.	2010-05	21188034
Use of venlafaxine compared with other antidepressants and the risk of sudden cardiac death or near death: a nested case-control study.	2010-02-05	20139216
Hypersensitivity reactions associated with platinum antineoplastic agents: a systematic review.	2010	20886011
Acute cough: a diagnostic and therapeutic challenge.	2009-12-16	20015366
[Documentation for acute treatment with clemastine (Tavegyl) is missing].	2009-09-11	19739446
Ebastine in the light of CONGA recommendations for the development of third-generation antihistamines.	2009-08-31	21437146
Clinical practice. Diagnosis and treatment of cow's milk allergy.	2009-08	19271238
Application of prolonged microdialysis sampling in carboplatin-treated cancer patients.	2009-08	19096847
Anaphylaxis to mefenamic acid in a patient with new onset of systemic lupus erythematosus.	2009-05-19	20153574
Psychoactive medication and traffic safety.	2009-03	19440432
Psoriasis vulgaris and digestive system disorders: is there a linkage?	2009-01	20164041
A similarity search using molecular topological graphs.	2009	20037730
Histamine upregulates keratinocyte MMP-9 production via the histamine H1 receptor.	2008-12	18548114
Neoadjuvant chemoradiation followed by surgery versus surgery alone for patients with adenocarcinoma or squamous cell carcinoma of the esophagus (CROSS).	2008-11-26	19036143
Canine African trypanosoma.	2008-09	18811787
Evaluation of efficacy and sedative profiles of H(1) antihistamines by large-scale surveillance using the visual analogue scale (VAS).	2008-09	18566547
Laparoscopic ileocolic resection versus infliximab treatment of distal ileitis in Crohn's disease: a randomized multicenter trial (LIR!C-trial).	2008-08-22	18721465
NEOadjuvant therapy monitoring with PET and CT in Esophageal Cancer (NEOPEC-trial).	2008-07-31	18671847
Synovial tissue response to rituximab: mechanism of action and identification of biomarkers of response.	2008-07	17965121
Major determinants and long-term outcomes of successful balloon dilatation for the pediatric patients with isolated native valvular pulmonary stenosis: a 10-year institutional experience.	2008-06-30	18581591
Antagonist affinity measurements at the Gi-coupled human histamine H3 receptor expressed in CHO cells.	2008-06-06	18538007
Practical recommendations on the use of lenalidomide in the management of myelodysplastic syndromes.	2008-05	18265982
Anti-inflammatory effects of low-intensity extremely high-frequency electromagnetic radiation: frequency and power dependence.	2008-04	18044738
Medication with antihistamines impairs allergen-specific immunotherapy in mice.	2008-03	18081882
[Chikungunya: fever and joint pains after vacation in a tropical area].	2008-02	18288627
A highly active and tolerable neoadjuvant regimen combining paclitaxel, carboplatin, 5-FU, and radiation therapy in patients with stage II and III esophageal cancer.	2008-01	17896144
Spectrophotometric determination of some histamine H1-antagonists drugs in their pharmaceutical preparations.	2008-01	17553739
Stereoselective synthesis of (-)-hydroxyclemastine as a versatile intermediate for the H1 receptor antagonist clemastine.	2007-12	18254238
Early detection of adverse drug events within population-based health networks: application of sequential testing methods.	2007-12	17955500
[Angioneurotic orolingual edema associated with the use of rt-PA following a stroke].	2007-10	17694290
Development and full validation of a sensitive quantitative assay for the determination of clemastine in human plasma by liquid chromatography-tandem mass spectrometry.	2007-08-15	17475437
[Emergency checklist: angioedema].	2007-08-02	17849784
Influence of immunomodulatory drugs on the cytotoxicity induced by monoclonal antibody 17-1A and interleukin-2.	2007-03	17562330
Intraoperative anaphylaxis after intravenous atropine.	2007-03	17087843
Psoriasis following growth hormone therapy in a child.	2007-01	17179190
[Pharmacological analysis of anti-inflammatory effects of low-intensity extremely high-frequency electromagnetic radiation].	2006-12-21	17175917
Dermatopathic lymphadenopathy: a differential diagnosis of enlarged lymph nodes in uremic pruritus.	2006-12	17176922
Impact of CYP2D6*10 on H1-antihistamine-induced hypersomnia.	2006-12	17089107
Phase II and pharmacological study of oral paclitaxel (Paxoral) plus ciclosporin in anthracycline-pretreated metastatic breast cancer.	2006-10-09	16969354
A novel self-microemulsifying formulation of paclitaxel for oral administration to patients with advanced cancer.	2006-09-18	16926835

Patents

Sample Use Guides

In Vivo Use Guide

Usual Adult Dose for Allergic Rhinitis Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day.

Route of Administration: Oral

In Vitro Use Guide

IHERG tails at -40 mV following depolarizing pulses to +20 mV were inhibited by clemastine with an IC50 value of 12 nM in HEK 293 cells

Substance Class	Chemical Created by `admin` on `Mon Mar 31 17:53:45 GMT 2025` Edited by `admin` on `Mon Mar 31 17:53:45 GMT 2025`
Record UNII	95QN29S1ID
Record Status	`Validated (UNII)`
Record Version

Download

Name

Type

Language

HS-592

Preferred Name

English

CLEMASTINE

Official Name

English

CLEMASTIN

Common Name

English

clemastine [INN]

Common Name

English

Clemastine [WHO-DD]

Common Name

English

CLEMASTINE [MI]

Common Name

English

PYRROLIDINE, 2-(2-(1-(4-CHLOROPHENYL)-1-PHENYLETHOXY)ETHYL)-1-METHYL-, (R-(R*,R*))

Common Name

English

CLEMASTINE [USAN]

Common Name

English

CLEMASTINE [VANDF]

Common Name

English

(+)-(2R)-2-(-(((R)-P-CHLORO-.ALPHA.-METHYL-.ALPHA.-PHENYLBENZYL)OXY)ETHYL)-1-METHYLPYRROLIDINE

Common Name

English

NSC-756685

Code

English

Classification Tree Code System Code

WHO-VATC

QD04AA14