Natacin Eye Drop is an antifungal medication. It is utilized in the treatment of fungal infections of the eyes. It kills the fungi that cause eye infections and thus treats the infection. Natacin Eye Drop is for external use only. Take it in the dose and duration as advised by your doctor. Hold the dropper close to the eye without touching it. Gently squeeze the dropper and place the medication inside the lower eyelid. Wipe off extra liquid. This medication is generally well tolerated but it may cause some eye irritation that usually subsides on its own in some time. Please consult your doctor if it does not get better or persists for a longer duration.