MedDataToolPhenytoin Infatabs are used to treat certain types of seizures, including grand mal and complex partial seizures, and to prevent seizures during or after brain surgery. It works by blocking specific channels in the brain that help control electrical activity, reducing the likelihood of seizures. You take it by mouth, starting with two Infatabs three times a day, and the maximum dose can go up to twelve Infatabs daily if needed. It's important to know that if you've had a severe allergic reaction to phenytoin or similar medications in the past, you should not take this medication. Additionally, it should not be taken with the drug delavirdine, as it can affect how well delavirdine works.
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Uses
- Generalized tonic-clonic seizures.
- Complex partial seizures.
- Seizures during or after neurosurgery.
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Dosage
Adults start with two Infatabs three times a day.
Most adults take six to eight Infatabs daily.
Children start with 5 mg/kg/day in two or three doses.
Children's maintenance dose is 4 to 8 mg/kg/day.
Elderly patients may need lower or less frequent doses.
Always follow your doctor's specific instructions for your dose.
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Side effects
Common
Nystagmusataxiaslurred speechdecreased coordinationSomnolencemental confusiondizzinessheadachesblood disorders
Serious
Suicidal behaviorsevere skin reactionsliver damageAllergic reactionsangioedema
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Warnings
⚠ Important warnings
- Not for once-a-day dosing.
- Risk of withdrawal seizures.
- May cause suicidal thoughts.
- Serious skin reactions possible.
- Monitor liver function in patients with liver disease.
- Pregnant women may need dosage adjustments.
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Drug interactions
- Ethosuximidemay increase phenytoin levelsCaution
- Fluconazolemay increase phenytoin levelsCaution
- Carbamazepinemay decrease phenytoin levelsCaution
- Warfarinmay alter blood clotting responseCaution
- John's wortmay decrease phenytoin levels.Caution
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Answers pulled from the FDA label only.
Medical Disclaimer: This content is provided for informational and educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before taking any medication.
Data Source: Publicly available drug labeling information from the U.S. Food and Drug Administration (FDA).
Data Source: Publicly available drug labeling information from the U.S. Food and Drug Administration (FDA).