Ethosuximide is available in Canada only by prescription.

Known as



Ethosuximide is used to control absence seizures.

How to Use

Take ethosuximide as prescribed. Do not adjust dosage without prior approval from your doctor. Ethosuximide may be taken with food.

Side Effects

Reactions may include cramps, nausea, vomiting, weight loos, diarrhea, drowsiness, skin rash, and abnormalities of the blood.


Patients taking ethosuximide should have frequent blood checks. Close supervision should be given to those who suffer from kidney or lung problems. Women should inform their doctors if they become pregnant. Do not use ethosuximide while breastfeeding. Use extreme caution when operating machinery or driving. If you experience multiple seizures and use this drug by itself, tell your doctor before starting treatment.

Missed Dose

Take as soon as you remember, then resume medication schedule.


Store at room temperature between 15°C and 30°C. Keep away from children, heat, light and moisture.



Click here to learn more about medications.

DisclaimerExpand Disclaimer Section

The material offered at this site is to provide general information about epilepsy to the public. It is not intended to be taken as medical advice. Although all material presented at this site has been thoroughly researched and is believed to be correct, Epilepsy Ontario accepts no liability. Consult your physician and/or neurologist with any questions you have. People with epilepsy should never discontinue anti-epileptic medications or make changes in activities unless specifically advised to do so by an attending physician.