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Dilantin Infatabs Oral

Generic Name: PHENYTOIN CHEWABLE TABLET - ORAL
Pronounced: (fen-eh-TOE-in, FEN-eh-toyn)

Dilantin Infatabs Oral Side Effects

Headache, nausea, vomiting, constipation, dizziness, drowsiness, trouble sleeping, or nervousness may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

Phenytoin may cause swelling and bleeding of the gums. Massage your gums and brush and floss your teeth regularly to minimize this problem. See your dentist regularly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur:

  • unusual eye movements
  • loss of coordination
  • slurred speech
  • confusion
  • muscle twitching
  • double or blurred vision
  • tingling of the hands/feet
  • facial changes (e.g., swollen lips, butterfly-shaped rash around the nose/cheeks)
  • excessive hair growth
  • increased thirst or urination
  • unusual tiredness
  • bone or joint pain
  • easily broken bones


This medication rarely may cause mood or behavior changes, such as anxiety, agitation, hostility, pressured/rapid speech, or thoughts of suicide. Tell your doctor immediately if you develop unusual (possibly sudden) mood changes.

For males, in the very unlikely event you have a painful or prolonged erection lasting 4 or more hours, stop using this drug and seek immediate medical attention, or permanent problems could occur.

Tell your doctor immediately if any of these highly unlikely but very serious side effects occur:

  • uncontrolled muscle movements
  • swollen glands (lymph nodes)
  • stomach/abdominal pain
  • persistent nausea/vomiting
  • yellowing eyes or skin
  • dark urine
  • easy bruising/bleeding
  • signs of infection (e.g., persistent sore throat or fever)


A serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include:

  • rash
  • high fever
  • itching
  • swelling
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

Dilantin Infatabs Oral Medical Alert

Your condition can cause complications in a medical emergency. For enrollment information call MedicAlert at 1-800-854-1166 (USA) or 1-800-668-1507 (Canada).

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