What is Cephadol used for?

Cephadol is indicated for Vertigo.

What development phase is Cephadol in?

Cephadol is FDA-approved (marketed).

What is the generic name of Cephadol?

DIPHENIDOL is the generic (nonproprietary) name of Cephadol.

Last reviewed 2026-04-20 · How we verify

Cephadol (DIPHENIDOL)

FDA-approved approved Small molecule Quality 21/100

Cephadol, also known as DIPHENIDOL, is a small molecule antiemetic medication that targets the muscarinic acetylcholine receptor M4. Originally developed and currently owned, it was FDA approved in 1967 for the treatment of vertigo. As an off-patent medication with no active Orange Book patents, it is available from generic manufacturers. Cephadol works by blocking the action of acetylcholine at the M4 receptor, which helps to alleviate symptoms of vertigo. Its commercial status and pharmacokinetic properties are not well-documented.

At a glance

Generic name	DIPHENIDOL
Drug class	Antiemetic
Target	Muscarinic acetylcholine receptor M4
Modality	Small molecule
Therapeutic area	Neuroscience
Phase	FDA-approved
First approval	1967

Approved indications

Vertigo

Common side effects

No common side effects on file.

Key clinical trials

Effect of Stellate Ganglion Block on Meniere's Disease (PHASE4)

Primary sources

Every claim on this page is sourced from regulatory or scientific primary sources. See our editorial policy for full methodology.

Source	Used for
FDA label	Mechanism, indications, dosing, boxed warnings, drug interactions
ClinicalTrials.gov	Trial enrolment, design, endpoints, results

Competitive intelligence

For the full competitive landscape — auto-detected comparators, recent regulatory actions across the set, upcoming PDUFA, patent timeline, sponsor landscape:

Cephadol CI brief — competitive landscape report
Cephadol updates RSS · CI watch RSS