Stiripentol 500mg capsules
Requires a prescription from a doctor or prescriber
Anticonvulsant medication
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Official medicine documents
Safety monitoring data
Yellow Card reports
The MHRA Yellow Card scheme collects reports of suspected side effects from healthcare professionals and patients. View the Drug Analysis Profile (iDAP) for real-world adverse reaction data.
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Suspected adverse reactions reported for Stiripentol
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Data from the MHRA Yellow Card scheme. A reported reaction does not necessarily mean the medicine caused it. Contains public sector information licensed under the Open Government Licence v3.0.
EudraVigilance
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Suspected adverse reactions reported for Stiripentol
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1 branded products available
MHRA licensed products
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Diacomit 500mg capsules
This is the NHS Drug Tariff indicative price used for reimbursement purposes. It may not reflect the price paid by patients or pharmacies.
View full Drug TariffSource: NHS Drug Tariff via NHSBSA. Derived from dm+d VMPP (Virtual Medicinal Product Pack) pricing data. Contains public sector information licensed under the Open Government Licence v3.0.
WHO defined daily dose (DDD)
1 gram
Not a recommended dose. The DDD is the assumed average maintenance dose per day for a drug used for its main indication in adults. It is a statistical measure used for research and comparison purposes only.
Source: WHO Collaborating Centre for Drug Statistics Methodology, distributed via the NHS dm+d supplementary BNF/ATC mapping files (NHSBSA). Contains public sector information licensed under the Open Government Licence v3.0.
Therapeutically similar medicines
Similarity is based on WHO Anatomical Therapeutic Chemical (ATC) classification and on a factual NHS dm+d therapeutic-grouping code prefix. Source data: NHS dm+d via TRUD (OGL v3.0), WHO ATC/DDD Index.
NHS prescribing volume and spending trends
Guidelines from the National Institute for Health and Care Excellence
NICE clinical guidance(4)
Fenfluramine for treating seizures associated with Dravet syndrome (TA808)
Cannabidiol with clobazam for treating seizures associated with Dravet syndrome (TA614)
Epilepsies in children, young people and adults (NG217)
Fenfluramine for treating seizures associated with Lennox–Gastaut syndrome in people 2 years and over (TA1050)
Source: National Institute for Health and Care Excellence (NICE). Contains public sector information licensed under the Open Government Licence v3.0.
Check stock at pharmacies and supply information
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Supply & safety information
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Codes for healthcare professionals and prescribing systems
These codes are used by healthcare IT systems and prescribers to identify this medicine.
NHS UK identifiers
Browse tools
SNOMED CT and dm+d codes from NHS TRUD (Technology Reference data Update Distribution), licensed under the Open Government Licence v3.0. BNF code shown is the factual mapping value distributed by NHS Business Services Authority (NHSBSA) in the dm+d supplementary file under OGL v3.0; it is not affiliated with, nor licensed from, the publishers of the British National Formulary. ATC codes from the WHO Collaborating Centre for Drug Statistics Methodology (whocc.no).
Active and completed clinical studies from ClinicalTrials.gov
Source: ClinicalTrials.gov, a database of the U.S. National Library of Medicine (NLM), National Institutes of Health (NIH). Data accessed via ClinicalTrials.gov API v2. Trial information is provided for research purposes and does not constitute medical advice.
Academic studies and reviews for this medicine's active substance
Showing the 50 most relevant studies.
Reviews & meta-analyses: 16 · Randomised trials: 3 · 2007–2026
Showing the 50 most relevant studies, sorted by most relevant.
N. Specchio, S. Auvin, A. Strzelczyk, et al.
Epilepsia Open, 2024
- Status Epilepticus
- Dioxolanes
- Anticonvulsants
Chen H, Li Y, Li H, et al.
2024
- Lactic Acid
- Cell Cycle Proteins
- Nuclear Proteins
The Warburg effect is a hallmark of cancer that refers to the preference of cancer cells to metabolize glucose anaerobically rather than aerobically1,2. This results in substantial accumulation of lacate, the end product of anaerobic glycolysis, in cancer cells3. However, how cancer metabolism affects chemotherapy response and DNA repair in general remains incompletely understood. Here we report that lactate-driven lactylation of NBS1 promotes homologous recombination (HR)-mediated DNA repair. Lactylation of NBS1 at lysine 388 (K388) is essential for MRE11-RAD50-NBS1 (MRN) complex formation and the accumulation of HR repair proteins at the sites of DNA double-strand breaks. Furthermore, we identify TIP60 as the NBS1 lysine lactyltransferase and the 'writer' of NBS1 K388 lactylation, and HDAC3 as the NBS1 de-lactylase. High levels of NBS1 K388 lactylation predict poor patient outcome of neoadjuvant chemotherapy, and lactate reduction using either genetic depletion of lactate dehydrogenase A (LDHA) or stiripentol, a lactate dehydrogenase A inhibitor used clinically for anti-epileptic treatment, inhibited NBS1 K388 lactylation, decreased DNA repair efficacy and overcame resistance to chemotherapy. In summary, our work identifies NBS1 lactylation as a critical mechanism for genome stability that contributes to chemotherapy resistance and identifies inhibition of lactate production as a promising therapeutic cancer strategy.
Abstract licence: CC BY
H. Sabet, Shrouk Ramadan, Dalia Kamal Ewis, et al.
Brain Network Disorders, 2025
Vandame D, Chancharme L, Joffre N, et al.
2023
R. Guerrini, C. Chiron, D. Vandame, et al.
Neuropediatrics, 2026
R. Nabbout, Arun Mistry, S. Zuberi, et al.
JAMA Neurology, 2019
Scheffer IE, Nabbout R, Lagae L, et al.
2025
- Epilepsies, Myoclonic
- Fenfluramine
- Anticonvulsants
ObjectiveWe analyzed the long-term safety and effectiveness of fenfluramine (FFA) in patients with Dravet syndrome (DS) in an open-label extension (OLE) study after participating in randomized controlled trials (RCTs) or commencing FFA de novo as adults.MethodsPatients with DS who participated in one of three RCTs or were 19 to 35 years of age and started FFA de novo were included. Key endpoints were: incidence of treatment-emergent adverse events (TEAEs) in the safety population, and median percentage change in monthly convulsive seizure frequency (MCSF) from the RCT baseline to end of study (EOS) in the modified intent-to-treat (mITT) population. Post hoc analyses compared effectiveness in patients on concomitant stiripentol (STP) vs those not taking STP, and assessed safety (TEAEs) and effectiveness (Clinical Global Impression-Improvement [CGI-I] scale ratings) in patients enrolled as adults.ResultsA total of 374 patients, including 45 adults, received ≥1 FFA dose. Median FFA exposure was 824 days (range, 7-1280). TEAEs occurring in ≥10% of patients were pyrexia, nasopharyngitis, decreased appetite, seizure, decreased blood glucose, diarrhea, abnormal echocardiography (only physiologic regurgitation), upper respiratory tract infection, influenza, vomiting, and ear infection; no valvular heart disease or pulmonary arterial hypertension was observed over the OLE. In the mITT population (n = 324), median percentage change in MCSF from baseline to EOS was -66.8% (p SignificanceOur OLE study of FFA in patients with DS confirmed previous positive findings and extended the exposure up to 3.5 years. No new or unexpected safety signals were observed and FFA demonstrated sustained and clinically meaningful reduction in MCSF.
Abstract licence: CC BY-NC
Gilmour Morrison, Julie Crockett, G. Blakey, et al.
Clinical Pharmacology in Drug Development, 2019
E. Ben-Menachem, B. Gunning, C. Arenas Cabrera, et al.
CNS Drugs, 2020
N. Sada, Suni Lee, T. Katsu, et al.
Science, 2015
Sources: aggregated from Europe PMC (EMBL-EBI), OpenAlex, Crossref, PubMed and other open scholarly databases. Retracted articles are excluded. Study information is provided for research purposes and does not constitute medical advice.
Pharmacology and chemical data from DrugBank
Key facts
Drug status
Approved
Major interactions
2 found
Half-life
4.5 to 13 hours
Mechanism
The mechanism by which stiripentol exerts its anticonvulsant effect in humans has not been fully elucidated.
Food interactions
5 warnings
Human targets
4 targets
Data: DrugBank · CC BY-NC 4.0
Pharmacokinetics at a glance
Absorption
[L42500]…
Half-life
4.5 to 13 hours
[L42500]
Protein binding
99%
[L42500]
Volume of distribution
1.03 L/kg
Metabolism
Elimination
73%
[A19740]
Its metabolites are excreted mainly via the kidney.…
Clearance
40 L/kg
Pharmacokinetic data: DrugBank · CC BY-NC 4.0
Approved in the US, Canada, and Europe, stiripentol is used to treat seizures associated with Dravet syndrome.[L880][L42500][L42510] It is marketed under the brand name Diacomit.
[L42500]
In Europe and Canada, stiripentol is indicated for use as adjunctive therapy with clobazam and [valproate] to refractory generalized tonic-clonic seizures in patients with Dravet syndrome in infancy whose seizures are not adequately controlled with clobazam and valproate alone.
[L880][L42510]
Known interactions with other medications. Always consult a healthcare professional.
Showing 50 of 2166 interactions
[L42505]
There is limited clinical data on stiripentol overdose in humans. In mice, high doses of stiripentol (600 to 1800 mg/kg i.p.) caused decreased motor activity and respiration. Overdose should be managed with supportive and symptomatic treatment.
[L42500]
Stiripentol is a positive allosteric modulator of GABAA receptors in the brain that enhances the opening duration of the channel by binding to a site different than the benzodiazepine binding site.[A19739] It binds to GABAA receptors containing any of the α, β, γ, or δ-subunits but displays the most potent potency when bound to receptors containing α3 or δ subunits.[A19742] Stiripentol also binds to GABAA receptor-dependent chloride channels via a barbiturate-like mechanism.[A250830] Stiripentol potentiates GABA transmission by enhancing the release of GABA,[A19739][A19740] reducing synaptosomal uptake of GABA,[L880] and inhibiting GABA transaminase-mediated breakdown of GABA.[L880]
Stiripentol is an inhibitor of lactate dehydrogenase (LDH), which is involved in the energy metabolism of neurons and regulation of neuronal excitation. The drug binds to the site separate from the enzyme's lactate and pyruvate binding sites, thereby inhibiting both pyruvate-to-lactate conversion and lactate-to-pyruvate conversion.[A19741] By inhibiting LDH, stiripentol may induce hyperpolarization, thereby reducing neuronal excitability.[A250830] LDH inhibitors, including stiripentol, mimic a ketogenic diet, where the energy source in the brain is switched from glucose to mainly ketone bodies. The ketone bodies directly regulate neuronal excitation and seizures via ATP-sensitive potassium channels and vesicular glutamate transporters.[A19741] Stiripentol is also suggested to exhibit neuroprotective properties, which may reduce injury caused by oxygen-glucose deprivation and glutamate excess.[A250830]
How the body processes this drug — absorption, distribution, metabolism, and elimination
[L42500]
The systemic exposure increases dose-proportionally.
[L880]
Stiripentol has a low bioavailability due to water insolubility and extensive metabolism.
[A19740]
[L42500]
[L42500]
[A19740]
[L880][L42510]
Other metabolic pathways include O-methylation of catechol metabolites, hydroxylation of the t-butyl group, and conversion of the allylic alcohol side-chain to the isomeric 3-pentanone structure.
[A19740]
In vitro studies suggested that the phase I metabolism of stiripentol is catalyzed by CYP1A2, CYP2C19 and CYP3A4 and possibly other enzymes.
[L42510]
[A19740]
Its metabolites are excreted mainly via the kidney. Urinary metabolites of stiripentol accounted collectively for the majority (73%) of an oral acute dose whereas a further 13-24% was recovered in feces as unchanged drug.
[L880]
[L880]
Proteins and enzymes this drug interacts with in the body
PMID:10449790 PMID:16412217
GABA-gated chloride channels, also named GABA(A) receptors (GABAAR), consist of five subunits arranged around a central pore and contain GABA active binding site(s) located at the alpha and beta subunit interfaces (By similarity). When activated by GABA, GABAARs selectively allow the flow of chloride anions across the cell membrane down their electrochemical gradient PMID:10449790 PMID:16412217
Enzymes involved in drug metabolism — important for understanding drug interactions
Proteins that transport this drug across cell membranes
PMID:2897240 PMID:35970996 PMID:8898203 PMID:9038218 PMID:35507548
Catalyzes the flop of phospholipids from the cytoplasmic to the exoplasmic leaflet of the apical membrane. Participates mainly to the flop of phosphatidylcholine, phosphatidylethanolamine, beta-D-glucosylceramides and sphingomyelins .
PMID:8898203
Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells PMID:2897240 PMID:35970996 PMID:9038218
PMID:11306452 PMID:12958161 PMID:19506252 PMID:20705604 PMID:28554189 PMID:30405239 PMID:31003562
Involved in porphyrin homeostasis, mediating the export of protoporphyrin IX (PPIX) from both mitochondria to cytosol and cytosol to extracellular space, it also functions in the cellular export of heme .
PMID:20705604 PMID:23189181
Also mediates the efflux of sphingosine-1-P from cells .
PMID:20110355
Acts as a urate exporter functioning in both renal and extrarenal urate excretion .
PMID:19506252 PMID:20368174 PMID:22132962 PMID:31003562 PMID:36749388
In kidney, it also functions as a physiological exporter of the uremic toxin indoxyl sulfate (By similarity). Also involved in the excretion of steroids like estrone 3-sulfate/E1S, 3beta-sulfooxy-androst-5-en-17-one/DHEAS, and other sulfate conjugates .
PMID:12682043 PMID:28554189 PMID:30405239
Mediates the secretion of the riboflavin and biotin vitamins into milk (By similarity). Extrudes pheophorbide a, a phototoxic porphyrin catabolite of chlorophyll, reducing its bioavailability (By similarity).
Plays an important role in the exclusion of xenobiotics from the brain (Probable). It confers to cells a resistance to multiple drugs and other xenobiotics including mitoxantrone, pheophorbide, camptothecin, methotrexate, azidothymidine, and the anthracyclines daunorubicin and doxorubicin, through the control of their efflux .
PMID:11306452 PMID:12477054 PMID:15670731 PMID:18056989 PMID:31254042
In placenta, it limits the penetration of drugs from the maternal plasma into the fetus (By similarity). May play a role in early stem cell self-renewal by blocking differentiation (By similarity).
In inflammatory macrophages, exports itaconate from the cytosol to the extracellular compartment and limits the activation of TFEB-dependent lysosome biogenesis involved in antibacterial innate immune response
ATC N03AX17
Chemical identifiers
CAS, UNII, InChI Key and database cross-references
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Chemical identifiers
CAS, UNII, InChI Key and database cross-references
Linked compound data from DrugBank Open Data (CC BY-NC 4.0)
Stiripentol
Additional database identifiers
Drugs Product Database (DPD)
21532
ChemSpider
4470940
BindingDB
50504273
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4075
GenAtlas
GABRA1
GeneCards
GABRA1
GenBank Gene Database
X13584
GenBank Protein Database
31631
Guide to Pharmacology
404
UniProt Accession
GBRA1_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4076
GenAtlas
GABRA2
GeneCards
GABRA2
GenBank Gene Database
S62907
GenBank Protein Database
386422
Guide to Pharmacology
405
UniProt Accession
GBRA2_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4077
GenAtlas
GABRA3
GeneCards
GABRA3
GenBank Gene Database
S62908
GenBank Protein Database
386424
Guide to Pharmacology
406
UniProt Accession
GBRA3_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4078
GenAtlas
GABRA4
GeneCards
GABRA4
GenBank Gene Database
U30461
GenBank Protein Database
905393
Guide to Pharmacology
407
UniProt Accession
GBRA4_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4079
GenAtlas
GABRA5
GeneCards
GABRA5
GenBank Gene Database
L08485
GenBank Protein Database
182916
Guide to Pharmacology
408
UniProt Accession
GBRA5_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4080
GenAtlas
GABRA6
GeneCards
GABRA6
GenBank Gene Database
S81944
GenBank Protein Database
1470364
Guide to Pharmacology
409
UniProt Accession
GBRA6_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4081
GenAtlas
GABRB1
GeneCards
GABRB1
GenBank Gene Database
X14767
GenBank Protein Database
31635
UniProt Accession
GBRB1_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4082
GenAtlas
GABRB2
GeneCards
GABRB2
GenBank Gene Database
S67368
GenBank Protein Database
455946
UniProt Accession
GBRB2_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4083
GenAtlas
GABRB3
GeneCards
GABRB3
GenBank Gene Database
M82919
GenBank Protein Database
182925
Guide to Pharmacology
412
UniProt Accession
GBRB3_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4084
GeneCards
GABRD
GenBank Gene Database
AF016917
GenBank Protein Database
2388693
UniProt Accession
GBRD_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4085
GeneCards
GABRE
GenBank Gene Database
U66661
GenBank Protein Database
1857126
UniProt Accession
GBRE_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4086
GeneCards
GABRG1
GenBank Gene Database
AK122845
GenBank Protein Database
193783776
UniProt Accession
GBRG1_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4087
GeneCards
GABRG2
GenBank Gene Database
X15376
GenBank Protein Database
31637
UniProt Accession
GBRG2_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4088
GeneCards
GABRG3
GenBank Gene Database
S82769
GenBank Protein Database
1754749
UniProt Accession
GBRG3_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4089
GeneCards
GABRP
GenBank Gene Database
U95367
GenBank Protein Database
2197001
UniProt Accession
GBRP_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:14454
GeneCards
GABRQ
GenBank Gene Database
AF189259
GenBank Protein Database
7861736
UniProt Accession
GBRT_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:6535
GenAtlas
LDHA
GeneCards
LDHA
GenBank Gene Database
X02152
GenBank Protein Database
34313
UniProt Accession
LDHA_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:6541
GenAtlas
LDHB
GeneCards
LDHB
GenBank Gene Database
X13794
GenBank Protein Database
1200083
UniProt Accession
LDHB_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:4088
GeneCards
GABRG3
GenBank Gene Database
S82769
GenBank Protein Database
1754749
UniProt Accession
GBRG3_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2621
GeneCards
CYP2C19
GenBank Gene Database
M61854
GenBank Protein Database
181344
Guide to Pharmacology
1328
UniProt Accession
CP2CJ_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2625
GenAtlas
CYP2D6
GeneCards
CYP2D6
GenBank Gene Database
M20403
GenBank Protein Database
181350
Guide to Pharmacology
1329
UniProt Accession
CP2D6_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2637
GenAtlas
CYP3A4
GeneCards
CYP3A4
GenBank Gene Database
M18907
Guide to Pharmacology
1337
UniProt Accession
CP3A4_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2596
GenAtlas
CYP1A2
GeneCards
CYP1A2
GenBank Gene Database
Z00036
Guide to Pharmacology
1319
UniProt Accession
CP1A2_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2623
GenAtlas
CYP2C9
GeneCards
CYP2C9
GenBank Gene Database
AY341248
Guide to Pharmacology
1326
UniProt Accession
CP2C9_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2615
GeneCards
CYP2B6
GenBank Gene Database
M29874
GenBank Protein Database
181296
Guide to Pharmacology
1324
UniProt Accession
CP2B6_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:2622
GenAtlas
CYP2C8
GeneCards
CYP2C8
GenBank Gene Database
M17397
Guide to Pharmacology
1325
UniProt Accession
CP2C8_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:40
GenAtlas
ABCB1
GeneCards
ABCB1
GenBank Gene Database
M14758
GenBank Protein Database
307180
Guide to Pharmacology
768
UniProt Accession
MDR1_HUMAN
HUGO Gene Nomenclature Committee (HGNC)
HGNC:74
GenAtlas
ABCG2
GeneCards
ABCG2
GenBank Gene Database
AF103796
GenBank Protein Database
4185796
Guide to Pharmacology
792
UniProt Accession
ABCG2_HUMAN
DrugBank citations
If you use DrugBank data in your research, please cite the following publications:
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Structured knowledge from the free knowledge base
ATC classifications (Wikidata)
Linked open data from Wikidata (Q412182), a free and open knowledge base operated by the Wikimedia Foundation. Data is available under the Creative Commons CC0 1.0 Public Domain Dedication.