Natamycin is a generic drug also known as Pimaricin with a trade as Natacyn. Natamycin treats particular kinds of the eye's fungal infections. Natamycin is an antifungal agent that occurs naturally and made during Streptomyces natalensis bacterium fermentation. Natamycin belongs to the class of medication known as ophthalmic anti-infectives. It acts by killing the sensitive fungi affecting the fungal cell wall formation therefore killing the fungus.