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Zarontin Oral

Generic Name: ETHOSUXIMIDE - ORAL
Pronounced: (eth-oh-SUX-uh-mide)

Zarontin Oral Side Effects

Dizziness, drowsiness, tiredness, headache, staggering walk/clumsiness, nausea, vomiting, loss of appetite, stomach pain/cramps, weight loss, or diarrhea may occur.

Many of these effects usually occur when you first start taking the medication but tend to disappear over time (usually in a few weeks). If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

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 swelling of the gums
  • swollen tongue
  • mental/mood changes
  • unusual/bad dreams
  • increased sexual interest
  • difficulty concentrating
  • unusual hair growth in females
  • vision changes


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.

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

  • fever
  • chills
  • persistent sore throat
  • easy bruising/bleeding
  • severe tiredness/weakness
  • pale skin
  • fast breathing even at rest


This medication may infrequently cause a serious immune system problem (systemic lupus erythematosus). Tell your doctor immediately if you experience any of these unlikely but serious side effects:

  • unusual tiredness
  • joint/muscle aches
  • unusual fever
  • butterfly-shaped facial rash
  • swollen glands
  • bloody/pink urine
  • swelling of the feet/ankles (edema)


Your doctor may need to order special tests if you experience these symptoms. Keep all laboratory and medical appointments.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

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