Griseofulvin (also known Gris peg) is an antifungal drug administered orally to treat tinea (ringworm) infections that do not respond to topical agents.. It is used both in animals and in humans, to treat fungal infections of the skin (commonly known as ringworm and athletes foot), nails and hair. It is derived from the mold Penicillium griseofulvum. Accurate diagnosis of the infection organism is essential and is contraindicated in porphyria.
It is administered orally. Most common side effects are hypersensitivity leading to rash, hives, photosensitivity, difficulty breathing; closing of your throat; swelling of your lips, tongue, or face.