(methsuximide)
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What are the possible side effects of CELONTIN?

What are the possible side effects of CELONTIN?

See "What is the most important information I should know about CELONTIN?"

CELONTIN may cause other serious side effects, including:

Grand mal seizures can happen more often or become worse

The most common side effects of CELONTIN include:

drowsiness
dizziness
headache
blurred vision
nausea or vomiting
constipation
diarrhea
weight loss
problems with walking and coordination (unsteadiness)
stomach pain
loss of appetite

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 CELONTIN. 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.

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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.