Methsuximide
Methsuximide is an anticonvulsant medication primarily used to treat absence seizures (petit mal seizures) in patients with epilepsy. It belongs to the succinimide class of antiepileptic drugs and is often considered when first-line treatments are ineffective or not tolerated.
Methsuximide is an anticonvulsant used to control absence seizures by reducing abnormal electrical activity in the brain.
Key facts at a glance
- ATC
- N03AD03
- RxNorm
- 47858
- Generic
- Methsuximide
- Class
- atc-n03
- Brands
- Celontin
- Availability
- rx
- Lactation
- unknown
- Routes
- oral
- Forms
- capsule
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treatment of absence seizures (petit mal seizures) in epilepsy. May be used when other anticonvulsants such as ethosuximide are ineffective or contraindicated.
Methsuximide is believed to work by blocking T-type calcium channels in thalamic neurons, which helps suppress the abnormal synchronized electrical discharges responsible for absence seizures.
May cause drowsiness, dizziness, or gastrointestinal upset. Rare but serious side effects can include blood disorders and severe skin reactions. Regular blood monitoring may be required. Use with caution in patients with liver or kidney impairment. Should not be stopped abruptly.
Official drug label
WellAlly may earn a referral fee from linked resources at no extra cost to you. Editorial content is never influenced by commercial relationships.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy