(ethosuximide)

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What are the possible side effects of ZARONTIN?

What are the possible side effects of ZARONTIN?

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See “What is the most important information I should know about ZARONTIN?”

ZARONTIN may cause other serious side effects, including:

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Serious allergic reactions. Call your healthcare provider right away if you have any of these symptoms:
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skin rash
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hives
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sores in your mouth
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blistering or peeling skin
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Changes in thinking, mood, or behavior. Some patients may get abnormally suspicious thoughts, hallucinations (seeing or hearing things that are not there), or delusions (false thoughts or beliefs).
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Grand mal seizures can happen more often or become worse

Call your healthcare provider right away, if you have any of the symptoms listed above.

The most common side effects of ZARONTIN include

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nausea or vomiting
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indigestion, stomach pain
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diarrhea
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weight loss
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loss of appetite
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hiccups
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fatigue
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dizziness or lightheadedness
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unsteadiness when walking
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headache
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loss of concentration

Tell your healthcare provider about any side effect that bothers you or that does not go away.

These are not all the possible side effects with ZARONTIN. For more information, ask your healthcare provider or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Additional Resources

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To report an adverse event related to a Pfizer product and you are not part of a clinical trial* for this medication, click the link below to submit your information: 
Pfizer Safety Reporting Site

*If you are involved in a clinical trial for either product, adverse events should be reported to your coordinating study site.

If you cannot use the above website to report an adverse event related to a Pfizer medication, please call (800) 438-1985.

You may also contact the U.S. Food and Drug Administration (FDA) directly to report adverse events or product quality concerns either online at www.fda.gov/medwatch or by calling (800) 332-1088.