Dilantin (Phenytoin) Information

The active ingredient in Dilantin is:

• Phenytoin: 100 mg per capsule, 50 mg per chewable tablet, or 125 mg/5 mL (oral suspension)

Other inactive ingredients may include:

• Magnesium stearate
• Gelatin (capsule form)
• Sucrose (chewable tablets)
• Artificial colorings

Common side effects include:

• Drowsiness
• Dizziness
• Fatigue
• Gingival hyperplasia (gum overgrowth)
• Nausea

Serious side effects requiring immediate medical attention:

• Severe allergic reactions (swelling, rash, difficulty breathing)
• Severe dizziness or fainting
• Abnormal eye movements (nystagmus)
• Signs of liver problems (yellowing of the skin or eyes)
• Suicidal thoughts or behavior

Dilantin is usually taken one to three times per day, depending on the prescribed dosage and form (capsule, chewable tablet, or oral suspension). The dosage is based on the patient's condition and response to treatment. Dilantin can be taken with or without food. It is important to take the medication exactly as prescribed and not to stop or change the dose without consulting your healthcare provider.

Important considerations:

• Do not miss doses or stop taking Dilantin suddenly, as this can lead to withdrawal seizures.
• Regular blood tests may be required to monitor the drug’s levels in your body and to avoid toxicity.
• Take care when consuming alcohol, as it may interact with Dilantin and increase the risk of side effects.

Dilantin can interact with many medications, including other anticonvulsants, blood thinners, and certain antibiotics.

Common interactions include:

• Other anticonvulsants: May alter the levels of Dilantin or other seizure medications in the blood.
• Blood thinners (e.g., warfarin): Dilantin may affect the blood-thinning properties, increasing the risk of bleeding.
• Antibiotics: Some antibiotics (such as rifampin) may reduce Dilantin levels, leading to seizure recurrence.

Dilantin typically starts working within hours of the first dose. However, it may take a few days to weeks to reach the optimal therapeutic effect, especially if the dosage is being adjusted or if a patient is starting Dilantin for the first time. Regular blood tests will help to determine the correct dosage.

If you experience any serious side effects such as severe dizziness, difficulty breathing, rash, or symptoms of liver problems (yellowing of the skin or eyes), contact your doctor immediately.

In the event of suicidal thoughts or behavior, seek immediate medical help or call a crisis helpline.