What Is the Normal Dilantin Level?


Dilantin is a prescription medication used in the treatment of seizures and epilepsy. Available under the generic name Phentoin, Dilantin has been approved by the FDA for use in adults and children who experience seizures. Dilantin is an oral tablet, which is prescribed in 100 mg increments. Your dosage of Dilantin will depend on the severity of your condition.


Take Dilantin exactly as it was prescribed by your physician. If you miss a dose, take the missed dose just as soon as you remember. If the time is near the next scheduled dose of Dilantin, skip your missed dose and take just the regular Dilantin dose. Do not double up on Dilantin. Do not suddenly stop this medication without first talking with your doctor.

Dosage Levels

Dilantin is prescribed in 100 mg tablets for oral consumption. For most adults, the normal dosage level of Dilantin is three tablets daily, but can increase to three additional tablets per day if needed. More than six caplets daily should only be administered under strict supervision from your physician.

Side Effects: Severe

Dilantin can be associated with severe side effects which can be life threatening. If you feel you are experiencing severe side effects after taking Dilantin, get emergency medical help. Side effects of Dilantin, which are considered severe, include muscle spasms, tremors, burning or itching skin rash or difficulty breathing. Dilantin may also cause feelings of severe depression or suicide. Get help immediately if you experience any of these side effects.

Side Effects: Moderate

Occasionally Dilantin is associated with side effects which are considered moderate. Moderate side effects of Dilantin are uncomfortable, but do not usually require immediate medical emergency treatment. Side effects of Dilantin include constipation, headache, feeling dizzy or nervous, agitation, feeling nauseous or vomiting. Restlessness is also a side effect of Dilantin. Tell your doctor if you have any of these side effects after taking Dilantin, as he may need to adjust your dosage.


Dilantin use can lower your blood sugar, so be sure your doctor is aware if you suffer from diabetes before taking Dilantin. Dilantin should be taken with a meal so that chances of side effects such as nausea and vomiting will be less likely to occur. Discontinuing use of Dilantin may cause seizure and epileptic episodes to occur suddenly. Do not stop taking Dilantin without permission from your doctor.

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