Generic name: Ketoconazole.

Nizoral is an antifungal. It destroys and prevents the growth of fungi.

Quick Facts About NizoralNizoral


Used to treat a variety of fungal infections, including oral thrush and candidiasis.

Nizoral Dosage

Take exactly as prescribed. Continue prescription if symptoms subside; otherwise infection may return. May take with food to avoid stomach irritation.

  • Usual adult dose: single daily dose of 200 milligrams. May be increased to 400 milligrams for serious infections.
  • Usual child dose: is infrequently prescribed for children in a single daily dose of 3.3 to 6.6 milligrams per 2.2 pounds of body weight. Not prescribed for children under 2 years.
  • Missed dose: take as soon as possible, unless almost time for next dose. If so, skip missed dose, go back to regular schedule. Do not double doses.

Nizoral Side Effects

Overdose symptoms:

no specific information available. If you suspect an overdose, immediately seek medical attention.

More common side effects: effects: nausea, vomiting.

Less common Nizoral side effects: abdominal pain, itching. Rare side effects: breast swelling in men, bulging fontanel (soft areas on baby’s scalp), depression, diarrhea, dizziness, drowsiness, fever and chills, headache, hives, impotence, light sensitivity, rash.


Inform your doctor before combining Nizoral with:

anticoagulants such as Coumadin; antiulcer medications such as Axid, Pepcid, Tagamet, Zantac; astemizole (Hismanal) — has caused fatal reactions involving the heart; corticosteroids such as prednisone and Medrol; cyclosporine (Sandimmune); isoniazid (Nydrazid); phenytoin (Dilantin); rifampin (Rifadin, Rifamate, Rimactane); terfenadine (Seldane) — has caused fatal reactions involving the heart; theophylline (Theo-24, Slo-Phyllin, Theo-Dur).

Avoid alcohol and antacids during Nizoral therapy. If necessary, take antacids 2 or 3 hours after taking medication. 

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Most likely appears in breast milk; could affect a nursing infant.

No special precautions apply to seniors.

Infrequently prescribed for children 2 years and over.

  • Do not take if sensitive to or allergic to Nizoral. Do not take with Seldane or Hisminal.
  • At risk of serious or fatal liver damage when taking Nizoral. Doctor will monitor your liver through blood tests. Immediately contact your doctor if you experience: unusual fatigue, loss of appetite, nausea or vomiting, jaundice, dark urine, pale stools.
  • Cases of anaphylaxis (life-threatening allergic reaction) have been reported after the first dose of Nizoral.
  • May cause drowsiness and impair your ability to drive a car or operate machinery. Do not take part in any activity that requires alertness.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Nizoral side effects, please contact your healthcare provider