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What is griseofulvin?

Griseofulvin oral tablet is a prescription drug that's available as the brand name drug Gris-PEG. It's also available as a generic drug. Generic drugs usually cost less than the brand-name version. In some cases, they may not be available in all strengths or forms as the brand-name drug.Griseofulvin also comes as an oral liquid suspension.

Why it's used

Griseofulvin oral tablet is used to treat fungal infections that can affect different parts of your body. These include your hair, nails, and skin.

How it works

Griseofulvin belongs to a class of drugs called antifungal agents. A class of drugs is a group of medications that work in a similar way. These drugs are often used to treat similar conditions.

This drug works by binding to a part of the fungus causing the infection in your body. This stops the fungus from multiplying. This drug also prevents fungus from spreading to new cells. These actions cause the infection to die off.

When should the medicine start working?

Griseofulvin starts to work straight away but it may take a few days or even weeks before you see a difference. As your child’s hair, skin or nails grow you will be able to see that the new part is not infected.

It is important that your child takes the whole course of the medicine that has been prescribed, until your doctor says they should stop. Do not stop early.

Griseofulvin Dosage

Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.

Shake the oral suspension (liquid) well just before you measure a dose. Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.

Side effects

  • Skin rash and peeling
  • Mouth sores
  • Sore throat
  • Headache
  • Diarrhea
  • Increased thirst
  • Dizziness and fainting
  • Unusual tiredness and weakness
  • Black or Tarry stools
  • Cloudy urine
  • Chest pain and discomfort
  • Trouble sleeping


Before taking griseofulvin, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have: a certain blood disorder (porphyria), severe liver disease (liver failure).