Common Side Effects of Stiripentol
Stiripentol, used to treat Dravet syndrome seizures in patients aged 2 and older taking clobazam, causes side effects in most patients. The most frequent include decreased appetite (46%), weight loss (30%), insomnia (24%), and somnolence (23%). Agitation (22%) and nausea (15%) also occur often.[1]
Serious Side Effects and Warnings
Serious risks include suicidal thoughts or behavior (0.4% risk, similar to other antiepileptics), severe skin reactions like Stevens-Johnson syndrome, and QT prolongation leading to irregular heartbeats. Patients with heart conditions or on QT-prolonging drugs need monitoring. Liver enzyme elevations occur in 1-3% of cases.[1][2]
Effects in Children and Long-Term Use
Children under 3 are more prone to side effects like vomiting (17%) and diarrhea (10%). Weight loss persists over time, affecting growth. Dose reductions or discontinuation may be needed if appetite loss exceeds 20% of body weight.[1]
Drug Interactions Causing Side Effects
Stiripentol inhibits CYP enzymes, boosting clobazam levels and intensifying sedation, ataxia, and hypotension. Avoid with strong CYP inducers like rifampin, which reduce efficacy. Hormonal contraceptives may fail due to metabolism changes.[1][2]
Managing and Reporting Side Effects
Monitor weight, appetite, and behavior weekly at start. Report new psychiatric symptoms or skin rashes immediately. FDA postmarketing data notes rare cases of aggression and hallucinations.[1]
[1]: FDA Label for Diacomit (Stiripentol)
[2]: Drugs.com - Stiripentol Side Effects