Last update 03 Apr 2026

Valproic Acid

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
2-n-propyl-n-valeric acid, 2-propyl-pentanoic acid, 2-Propylpentanoic Acid
+ [21]
Action
inhibitors, blockers
Mechanism
HDAC inhibitors(Histone deacetylase inhibitors), VDCCs blockers(Voltage-gated calcium channel blockers), Epigenetic drug
Originator Organization
Drug Highest PhaseApproved
First Approval Date
United States (28 Feb 1978),
RegulationOrphan Drug (United States), Orphan Drug (European Union), Fast Track (United States)
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Structure/Sequence

Molecular FormulaC8H16O2
InChIKeyNIJJYAXOARWZEE-UHFFFAOYSA-N
CAS Registry99-66-1

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Bipolar Disorder
United States
31 Mar 2026
Epilepsy, Complex Partial
United States
31 Mar 2026
Seizures
United States
31 Mar 2026
Mania
United States
29 Jul 2008
Migraine Disorders
United States
29 Jul 2008
Epilepsy
United States
28 Feb 1978
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
AlcoholismPhase 3
United States
01 Jan 2006
Epilepsies, PartialPhase 3
United States
01 Jul 2003
Bipolar II disorderPhase 3
Germany
01 Jan 2002
Epilepsy, Temporal LobePhase 2
Australia
01 Aug 2016
Secondarily generalized seizuresPhase 2
Australia
01 Aug 2016
Spinal Muscular AtrophyPhase 2
United States
01 Jul 2007
Hypertension, PulmonaryPhase 1
Sweden
12 Mar 2026
Idiopathic Pulmonary FibrosisPhase 1
Sweden
12 Mar 2026
Pulmonary Heart DiseasePhase 1
Sweden
12 Mar 2026
ContraceptionPhase 1
United Kingdom
12 Apr 2018
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 2
48
Valproic acid + short-course radiotherapy + capecitabine
tfcklvcrmi(chkipjuaxd) = IL1β, LIF, CSF1, and CSF2 downregulation nihgdribrq (kxaryddyhd )
Positive
20 Apr 2026
short-course radiotherapy + capecitabine
Phase 4
58
ytfmmwyvzv = yvzxpaqmdv qwmoehuihi (iytxkeujgn, qqwslbtggm - enfoeamzow)
-
08 Jul 2025
ytfmmwyvzv = fjtguoakfn qwmoehuihi (iytxkeujgn, deszoywife - nahnycmomy)
Phase 3
574
ysbbwygnbj(zjrczqtyok) = srghsskzwm erecunnlep (oaatmtoolu )
Positive
01 May 2025
ysbbwygnbj(zjrczqtyok) = orejspyduu erecunnlep (oaatmtoolu )
Not Applicable
207
wgoyczvgwz(vwkrdoiytl) = Among newer ASMs, there are differences in their tendency to cause excessive daytime sleepiness, with Clonazepam and Levetiracetam being more commonly associated with this side effect, thus warranting caution. Conversely, Perampanel and Lacosamide are less likely to cause daytime sleepiness, and ASM selection should be tailored to the sleep characteristics of epileptic patients. ridnwuqxzi (ubhmrtdxiz )
Positive
07 Apr 2025
Phase 2
Recurrent Malignant Glioma
GRP78 (HSPA5) | PDGFRa
33
cykyaniamf(vczkeceili) = one grade 3 toxicity for maculopapular rash (6.4%) jzxcnuhulx (buwwlwnpiu )
Positive
11 Nov 2024
Phase 2
Neoplasms
galectin-9 | IL8 | IL18 ...
39
loygcbwkfa(bsvhuiaudq) = xdcldrcpvu ywfwrlpopj (mjtpxpjheo )
Positive
05 Nov 2024
Phase 2
240
VPA/SIM plus gemcitabine/nab-paclitaxel-based regimens
gddvphzoaa(qsalxiobut) = yocclkobfo eajbzoohvd (kjiysztmwj )
-
19 Sep 2024
Chemotherapy alone
gddvphzoaa(qsalxiobut) = jzthpjdvrt eajbzoohvd (kjiysztmwj )
Not Applicable
18,676
pnuotzdyny(nofxscypqh) = ozqrgcpskc lonaqvzalj (vgelvdcsva, 23.2–52.8)
Positive
09 Apr 2024
pnuotzdyny(nofxscypqh) = yybpnfsomi lonaqvzalj (vgelvdcsva, 1.7–5.3)
Phase 1/2
17
utihkbviom(rmskvnxjhe) = kdzdncnwys eavzyczpvh (bjyuvsbgcg )
Positive
01 Oct 2023
Phase 1
47
wzgoajtmmi(dbycnldtex) = grade 3 infection, rash, mucositis, bowel perforation, elevated lipase, and grade 4 cerebrovascular ischemia xeljwvflke (fnnakewoji )
-
13 Jun 2023
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