Mephenytoin Side Effects
Applies to mephenytoin: oral tablet.
Mephenytoin is not commercially available in the United States.
Do not stop taking your medication even if you feel better. It is important to continue taking mephenytoin to prevent your seizures from recurring.
Do not change the brand, generic formulation, or dosage of this medication without first talking to your doctor.
Carry or wear a medical identification tag to let others know that you are taking this medicine in the case of an emergency.
If you experience any of the following serious side effects, stop taking mephenytoin and seek emergency medical attention:
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an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);
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hallucinations;
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slurred speech or staggering walk;
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a rash;
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changes in vision;
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agitation;
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yellow skin or eyes (jaundice);
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easy bruising or bleeding; or
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swollen or tender gums.
Other, less serious side effects may be more likely to occur. Continue to take mephenytoin and talk to your doctor if you experience
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nausea, vomiting, constipation, or diarrhea;
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mild dizziness or drowsiness;
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tender or swollen glands;
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headache;
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muscle twitches;
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increased facial hair;
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swelling of the breasts; or
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insomnia.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
More about mephenytoin
Further information
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.
