Epilepsy Home > Zarontin Side Effects

Some of the common side effects of Zarontin include a loss of appetite, nausea, and an upset stomach. Zarontin side effects are typically minor and require little or no treatment. However, you should contact your healthcare provider right away if you develop more serious side effects of Zarontin, such as hallucinations, suicidal thoughts, or unusual bleeding and bruising.

An Introduction to Zarontin Side Effects

As with any medicine, side effects are possible with Zarontin® (ethosuximide). However, not everyone who takes the medication will experience side effects. In fact, most people tolerate Zarontin quite well. If side effects do occur, in most cases, they are minor and either require no treatment or are easily treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with Zarontin. Your healthcare provider can discuss a more complete list of Zarontin side effects with you.)

Common Zarontin Side Effects

Zarontin is an older seizure medication, approved many years ago. With newer medications, the side effects are carefully documented, and the exact percentage of people that develop each side effect is known. With older medications, like Zarontin, information on side effects is less specific, and the exact percentages are not reported.
While the exact percentage of people who developed each Zarontin side effect was not reported, it is known that gastrointestinal system (digestive system) side effects are most common. These side effects of Zarontin include:
  • Loss of appetite
  • Upset stomach
  • Nausea and vomiting
  • Abdominal (or stomach) cramps and pain
  • Throat or chest pain (sometimes felt as heartburn or indigestion)
  • Weight loss
  • Diarrhea.
Other possible Zarontin side effects include:
  • Problems with the gums
  • Drowsiness
  • Headaches
  • Dizziness
  • Hiccups
  • Irritability
  • Fatigue
  • Vision problems
  • Vaginal bleeding.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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