DIPHENIDOL

US Previously Marketed

First approved in 1967

Details

Stereochemistry	ACHIRAL
Molecular Formula	C21H27NO
Molecular Weight	309.4452
Optical Activity	NONE
Defined Stereocenters	0 / 0
E/Z Centers	0
Charge	0

SHOW SMILES / InChI

Structure Search

SMILES

OC(CCCN1CCCCC1)(C2=CC=CC=C2)C3=CC=CC=C3

InChI

InChIKey=OGAKLTJNUQRZJU-UHFFFAOYSA-N

InChI=1S/C21H27NO/c23-21(19-11-4-1-5-12-19,20-13-6-2-7-14-20)15-10-18-22-16-8-3-9-17-22/h1-2,4-7,11-14,23H,3,8-10,15-18H2

HIDE SMILES / InChI

Molecular Formula	C21H27NO
Molecular Weight	309.4452
Charge	0
Count

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

Description
Sources: https://www.drugs.com/cons/diphenidol.html | https://www.ncbi.nlm.nih.gov/pubmed/26481789

Diphenidol, a nonphenothiazinic antiemetic agent used primarily in patients with Meniere disease and labyrinthopathies to treat vomiting and vertigo, is considered to be a relatively safe drug. Since it was first approved in the United States in 1967, this drug has been widely used in Latin America and Asia and has contributed to sporadic suicidal and accidental poisonings in mainland China and Taiwan. The mechanism by which diphenidol exerts its antiemetic and antivertigo effects is not precisely known. It is thought to diminish vestibular stimulation and depress labyrinthine function and as an antimuscarinic agent. An action on the medullary chemoreceptive trigger zone may also be involved in the antiemetic effect. Diphenidol has no significant sedative, tranquilizing, or antihistaminic action. It has a weak peripheral anticholinergic effect. Diphenidol is used to relieve or prevent nausea, vomiting, and dizziness caused by certain medical problems.

CNS Activity

Originator

Approval Year

Targets

Primary Target	Pharmacology	Potency
Muscarinic acetylcholine receptor M1 168 Target ID: CHEMBL216 Sources: https://www.drugbank.ca/drugs/DB01231	Antagonist 2849	6.37 null [pKi]
Muscarinic acetylcholine receptor M2 121 Target ID: CHEMBL211 Sources: https://www.drugbank.ca/drugs/DB01231	Antagonist 2849	5.55 null [pKi]
Muscarinic acetylcholine receptor M3 160 Target ID: CHEMBL245 Sources: https://www.drugbank.ca/drugs/DB01231	Antagonist 2849	5.95 null [pKi]
Muscarinic acetylcholine receptor M4 87 Target ID: CHEMBL1821 Sources: https://www.ncbi.nlm.nih.gov/pubmed/18395442	Antagonist 2849	6.04 null [pKi]
Muscarinic acetylcholine receptor M5 63 Target ID: CHEMBL2035 Sources: https://www.ncbi.nlm.nih.gov/pubmed/18395442	Antagonist 2849	5.89 null [pKi]

Conditions

Condition	Modality	Targets	Highest Phase	Product
Peripheral vertigo 3 Sources: https://www.drugs.com/cons/diphenidol.html	Primary		Approved 8583	VONTROL Approved Use INDICATIONS VERTIGO—‘Vontrol’ is indicated in peripheral (labyrinthine) vertigo and associated nausea and vomiting, as seen in such conditions as: Meniere’s disease, middle- and inner-ear surgery (labyrinthitis). NAUSEA AND VOMITING—‘Vontrol’ is indicated in the control of nausea and vomiting, as seen in such conditions as: postoperative states, malignant neoplasms and labyrinthine disturbances. Launch Date 1967

C_max

Value	Dose	Co-administered	Analyte	Population
157.4 ng/mL EXPERIMENT https://pubmed.ncbi.nlm.nih.gov/18506741/	25 mg 2 times / day multiple, oral dose: 25 mg route of administration: Oral experiment type: MULTIPLE co-administered:		DIPHENIDOL plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: FED

AUC

Value	Dose	Co-administered	Analyte	Population
445.57 ng × h/mL EXPERIMENT https://pubmed.ncbi.nlm.nih.gov/18506741/	25 mg 2 times / day multiple, oral dose: 25 mg route of administration: Oral experiment type: MULTIPLE co-administered:		DIPHENIDOL plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: FED

T_1/2

Value	Dose	Co-administered	Analyte	Population
3.23 h EXPERIMENT https://pubmed.ncbi.nlm.nih.gov/18506741/	25 mg 2 times / day multiple, oral dose: 25 mg route of administration: Oral experiment type: MULTIPLE co-administered:		DIPHENIDOL plasma	Homo sapiens population: HEALTHY age: ADULT sex: MALE food status: FED

Doses

Dose	Population	Adverse events
15 mg/kg single, intravenous Highest studied dose Dose: 15 mg/kg Route: intravenous Route: single Dose: 15 mg/kg Sources: https://pubmed.ncbi.nlm.nih.gov/1091418/	unhealthy, adult Health Status: unhealthy Age Group: adult Sex: unknown Sources: https://pubmed.ncbi.nlm.nih.gov/1091418/	Disc. AE: Central nervous system disorder NOS... AEs leading to discontinuation/dose reduction: Central nervous system disorder NOS (14 patients) Sources: https://pubmed.ncbi.nlm.nih.gov/1091418/

AEs

AE	Significance	Dose	Population
Central nervous system disorder NOS	14 patients Disc. AE	15 mg/kg single, intravenous Highest studied dose Dose: 15 mg/kg Route: intravenous Route: single Dose: 15 mg/kg Sources: https://pubmed.ncbi.nlm.nih.gov/1091418/	unhealthy, adult Health Status: unhealthy Age Group: adult Sex: unknown Sources: https://pubmed.ncbi.nlm.nih.gov/1091418/

Overview

CYP3A4	CYP2C9	CYP2D6	hERG

OverviewOther

Other Inhibitor	Other Substrate	Other Inducer
OCT2 779	OCT2 434 UGT2B7 456

Drug as perpetrator

Target	Modality	Activity	Metabolite	Clinical evidence
OCT2 782	inhibitor 4027 Sources: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3971011/	yes [IC50 35 uM]

Drug as victim

Target	Modality	Activity	Metabolite	Clinical evidence
OCT2 434	substrate 4014 Sources: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3971011/	no
UGT2B7 456	substrate 4014 Sources: http://www.latamjpharm.org/resumenes/35/9/LAJOP_35_9_2_6.pdf	yes

Sourcing

Vendor/Aggregator	ID	URL
ChEBI	CHEBI:4638	https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:4638
ChemicalBook	CB8474607	https://www.chemicalbook.com/ChemicalProductProperty_EN_CB8474607
eMolecules	1986522	https://www.emolecules.com/cgi-bin/more?vid=1986522
ZINC	ZINC000000968266	http://zinc15.docking.org/substances/ZINC000000968266

PubMed

Title	Date	PubMed
Profiling of a prescription drug library for potential renal drug-drug interactions mediated by the organic cation transporter 2.	2011-07-14	21599003
Evaluation of phenoxybenzamine in the CFA model of pain following gene expression studies and connectivity mapping.	2010-09-16	20846436
(2-Methyl-phen-yl)(phen-yl)methanol.	2010-07-31	21588424
Diphenidol inhibited sodium currents and produced spinal anesthesia.	2010-06	20176039
Neuropharmacology of vestibular system disorders.	2010-03	20808544
Generation of gold nanostructures at the surface of platinum electrode by electrodeposition for ECL detection for CE.	2010-03	20309916
[Clinical analysis on the cervical vertigo after operation of middle ear].	2009-05	19670624
Ultra-fast chromatographic micro-assay for quantification of diphenidol in plasma: application in an oral multi-dose switchability trial.	2008-10	18506741
Diphenidol-related diamines as novel muscarinic M4 receptor antagonists.	2008-05-01	18395442
Effects of endolymphatic sac drainage with steroids for intractable Meniere's disease: a long-term follow-up and randomized controlled study.	2008-05	18520184
Synthesis and pharmacological profile of a series of 1-substituted-2-carbonyl derivatives of Diphenidol: novel M4 muscarinic receptor antagonists.	2008-03	18336331
Enzymatic preparation of cefaclor with immobilized penicillin acylase.	2008	18320464
A novel amperometric sensor for the detection of difenidol hydrochloride based on the modification of Ru(bpy)(3)(2+) on a glassy carbon electrode.	2007-10-15	19073084
Capillary electrophoresis with end-column electrochemiluminescence for the analysis of chloroquine phosphate and the study on its interaction with human serum albumin.	2007-06-22	17498727
Determination of difenidol hydrochloride by capillary electrophoresis with electrochemiluminescence detection.	2006-02-02	16364700
Oral administration of prednisone to control refractory vertigo in Ménière's disease: a pilot study.	2005-09	16151353
Development of an HPLC method for determination of diphenidol in plasma and its application in an oral multi-dose bioequivalence study in a healthy female Mexican population.	2005-07-15	15967303
Diphenidol has no actual broad antiemetic activity in dogs and ferrets.	2004-11	15528840
Synthesis and antagonistic activity at muscarinic receptor subtypes of some derivatives of diphenidol.	2003-09	13679157
Simultaneous determination of enantiomers of structurally related anticholinergic analogs in human serum by liquid chromatography-electrospray ionization mass spectrometry with on-line sample cleanup.	2001-10-25	11678378
Neuropharmacological mechanisms of emesis. I. Effects of antiemetic drugs on motion- and apomorphine-induced pica in rats.	1995-11	8786672

Patents

Sample Use Guides

In Vivo Use Guide

For oral dosage form (tablets): Adults: 25 to 50 milligrams (mg) every four hours as needed.

Route of Administration: Oral

In Vitro Use Guide

In vitro binding assays demonstrated that difenidol at micromolar concentrations bound to the α(1A)-, α(1B)- and α(1D)-adrenoceptor subtypes. Difenidol inhibited the phenylephrine-induced increase in [Ca(2+)](i) in Chinese hamster ovary cells expressing human α(1A)-, α(1B)- or α(1D)-adrenoceptor subtypes with similar IC(50) values in the low micromolar range.

Substance Class	Chemical Created by `admin` on `Mon Mar 31 17:51:16 GMT 2025` Edited by `admin` on `Mon Mar 31 17:51:16 GMT 2025`
Record UNII	NQO8R319LY
Record Status	`Validated (UNII)`
Record Version

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Name

Type

Language

DIPHENIDOL

Official Name

English

DIFENIDOL

Preferred Name

English

?,?-Diphenyl-1-piperidinebutanol

Systematic Name

English

DIPHENIDOL [MI]

Common Name

English

DIPHENIDOL [VANDF]

Common Name

English

DIPHENIDOL [USAN]

Common Name

English

DIPHENIDOL [HSDB]

Common Name

English

SK&F 478

Code

English

1-PIPERIDINEBUTANOL, .ALPHA.,.ALPHA.-DIPHENYL-

Systematic Name

English

SK&F-478

Code

English

Difenidol [WHO-DD]

Common Name

English

difenidol [INN]

Common Name

English

Classification Tree Code System Code

NDF-RT

N0000009034