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What is a PHENYTOIN?

The Phenytoin test is a blood test used to measure the level of phenytoin; an anticonvulsant drug prescribed for epilepsy and seizure disorders. Phenytoin levels must be carefully monitored because the drug has a narrow therapeutic range—too little may fail to control seizures, while too much can cause toxicity, including dizziness, confusion, or heart rhythm problems. This test is performed to ensure safe and effective dosing, guide treatment adjustments, and prevent adverse side effects in patients receiving phenytoin therapy.

Additional Information

Also known as/ Other names: Phenytoin Level Test, Serum Phenytoin Test, Dilantin Level, Phenytoin Therapeutic Drug Monitoring
Parameters: 1
Recommended for: M/F/Others
Sample Type: Blood
Patient Preparation: Recommended specimen: just before the next dose is due at steady state.
Reports: Same Day

FAQs

Why is this test important?

It helps prevent underdosing, which may cause seizures, and overdosing, which can lead to toxicity and serious side effects.

Who should undergo this test?

Patients taking phenytoin for epilepsy or seizure disorders are recommended for regular monitoring.

What happens if the test shows low levels?

Low levels may indicate inadequate seizure control, requiring dose adjustment.

What happens if the test shows high levels?

High levels suggest toxicity, which can cause dizziness, confusion, or heart rhythm problems.

Can medications affect the test results?

Yes, other drugs may interact with phenytoin, altering its blood levels.

Is this test safe for children?

Yes, it is safe and often necessary for pediatric patients on phenytoin.

How often should the test be repeated?

It is repeated regularly, especially when starting therapy, changing doses, or adding new medications.

Can phenytoin toxicity be prevented?

Yes, regular monitoring and dose adjustments help prevent toxicity.

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