Why is griseofulvin used to treat topical dermatophytic infections of the hair?

Griseofulvin. Griseofulvin is an oral antifungal medication. By taking an oral medication, a fungal infection can be controlled from the inside of the body to the outside, by preventing the fungus from growing into the skin or into the hair follicles. Often this will be combined with a topical antifungal as well.