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Dilantin Toxicity


Dilantin, or phenytoin, toxicity happens when you have high levels of Dilantin in your body that become harmful. Dilantin is a medicine that is used to prevent and treat seizures. Dilantin toxicity can lead to a coma.


Return to the emergency department if:

  • You have fast, uncontrollable eye movements or double vision.
  • You have a lack of coordination of fingers, hands, arms, legs, or other part of your body.
  • You are dizzy, drowsy, or confused.
  • Your speech is slurred.
  • You have irregular or jerky movements.
  • You cannot be awakened.

Contact your healthcare provider if:

  • You missed a dose of Dilantin.
  • You have nausea, or you are vomiting.
  • You have a decreased appetite.
  • Your abdomen is bloated.
  • You have questions or concerns about your condition or care.

How to safely take Dilantin:

  • Take this medicine exactly as directed. Contact your healthcare provider if you miss a dose or you have any questions about how to take Dilantin.
  • Do not stop taking Dilantin or change your dose. Your risk of seizures increases if you decrease your dose or stop taking Dilantin. Even a small increase in your dose can cause toxicity.
  • Go to all your follow-up appointments. Your healthcare provider will need to monitor you closely while you are taking Dilantin. You will need regular blood and urine tests.

Prevent falls:

You may still be at risk of falling for a period of time after treatment. Follow your healthcare provider's recommendations for preventing falls.

What else you should do while you are taking Dilantin:

Wear medical alert jewelry or carry a card that says you take Dilantin. Ask where to get these items.

What to do if you think you or someone you know took too much Dilantin:

Call the Poison Control Center at 1-800-222-1222 immediately.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.