Phenytoin (Eptoin & Dilantin) Test
- Category
- Drug Monitoring
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 4 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Measures the level of Phenytoin in your blood. Phenytoin is used for epilepsy.
Why this test is performed?
Phenytoin works best within a specific range — too little may not work and too much can cause side-effects or toxicity. Monitoring helps your doctor adjust the dose safely.
Who should take this test?
People taking this medicine, to check the dose is safe and effective — as advised by the doctor.
Test Preparation
No fasting is needed. The sample is usually taken just before your next scheduled dose (trough level) — follow your doctor's instructions and note the time of your last dose.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
- Report time: In 5 days
- No fasting
- Report time: In 5 days
- No fasting
- Report time: In 6 days
- No fasting
- Report time: In 4 days
- No fasting
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Frequently asked questions
Usually the sample is taken just before your next dose (trough level), unless your doctor says otherwise. Note the time of your last dose.
No fasting is needed. The sample is usually taken just before your next scheduled dose (trough level) — follow your doctor's instructions and note the time of your last dose.
Blood sample taken from a vein in your arm.
Usually within 3–4 days after the sample reaches the lab. You will receive the report online.
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