Griseofulvin is an antifungal drug. It is used both in animals and in humans, to treat ringworm infections of the skin and nails. It is derived from the mold Penicillium griseofulvum. An antifungal drug is medication used to treat fungal infections such as athletes foot, ringworm and candidiasis (thrush), as well as serious systemic infections like cryptococcal meningitis. ... Ringworm, also known as Tinea is a contagious fungal infection of the skin. ... Species Penicillium notatum Penicillium glaucum Penicillium candida Penicillium roqueforti Penicillium marneffei Penicillium bilaiae Penicillium, commonly known as bread mold, is a genus of fungus that includes: Penicillium notatum, which produces the penicillin antibiotic. ...