Drug

Ethosuximide clinical trials

Also written Zarontin.

studies test it: 9
open now: 1
in phase 3: 2
first study started: 2004

How each study uses Ethosuximide is sorted by a rule, right about nine times in ten. Readers can ask us to read every study one by one.Ask us to read each study

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Approvals

The first approval found in each region, with its record

United States: 2 Nov 1960 · ZARONTIN · NDA 012380 (FDA, Drugs@FDA)
European Union: Not in EMA's list of EU-wide authorisations

From FDA's Drugs@FDA and Purple Book (through openFDA) and the European Medicines Agency, files of Sept 2026 and 27 Oct 2026. National approvals in Europe and other countries are not included. How this is worked out

How studies write it

Studies that test it under each name

Name

Ethosuximide: 8

Brand

Zarontin: 4

Studies by the year they started

9 studies that test it; most in 2019 (2)

Studies that test Ethosuximide, by start year
Year	Studies
2004	1
2008	1
2010	1
2011	1
2014	1
2018	1
2019	2
2020	1

By phase

A phase 1/2 study counts in both.

Early Phase 1: 1
Phase 1: 1
Phase 2: 6
Phase 3: 2

What it is tested for

Each study’s main condition, where its own words name it, so a study counts once.

Neuralgia: 2
Irritable Bowel Syndrome: 2
Depressive Disorder, Treatment-Resistant: 1
Epilepsy, Absence: 1
Neoplasms: 1
Migraine Disorders: 1
Complex Regional Pain Syndromes: 1

Who runs them

Industry 0 · Other 9

University Hospital, Clermont-Ferrand (3) · Zhejiang University (1) · Children's Hospital Medical Center, Cincinnati (1) · Royal Marsden NHS Foundation Trust (1) · Tanta University (1) · US Department of Veterans Affairs (1) · McGill University Health Centre/Research Institute of the McGill University Health Centre (1)

Often tested with

Tested in the same studies.

Lamotrigine (1) · Valproic Acid (1)

Studies

Open first, then newest update. How each study uses Ethosuximide is read from its arms, and is right about nine times in ten. Ask us to read each study. These are the studies that list it as an intervention; a search of ClinicalTrials.gov also finds studies that mention it only in a description, such as earlier treatment.

Testing it · 9

Codes

What other systems call Ethosuximide · ClinicalTrials.gg INT007457

MeSH (NLM) D005013EthosuximideConfirmed ClinicalTrials.gov, NLM, Wikidata
UNII (FDA) 5SEH9X1D1DETHOSUXIMIDEConfirmed FDA, NLM, Wikidata
RxNorm 4135Confirmed FDA, Wikidata
Wikidata Q421567ethosuximideConfirmed FDA, NLM, Wikidata
NCI Thesaurus C47523EthosuximideOne source FDA
DrugBank DB00593One source Wikidata

System	Code	Name there	Checked by
MeSH (NLM)	D005013	Ethosuximide	Confirmed ClinicalTrials.gov, NLM, Wikidata
UNII (FDA)	5SEH9X1D1D	ETHOSUXIMIDE	Confirmed FDA, NLM, Wikidata
RxNorm	4135	—	Confirmed FDA, Wikidata
Wikidata	Q421567	ethosuximide	Confirmed FDA, NLM, Wikidata
NCI Thesaurus	C47523	Ethosuximide	One source FDA
DrugBank	DB00593	—	One source Wikidata

“Confirmed” means two independent publishers link the code to this drug; “one source”, one does and its name agrees.