Dilantin (Phenytoin) Side Effects, Important Information, Before Taking & What to Avoid

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Dilantin Side Effects. Severity: Major. You should check with your doctor immediately if any of these side effects occur when taking phenytoin:

  • Decreased coordination
  • mental confusion
  • nervousness
  • slurred speech
  • trouble with breathing, speaking, or swallowing
  • unsteadiness, trembling, or other problems with muscle control or coordination
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