Zincula Eye Drop is sympathomimetic (alpha receptor agonist) used in the treatment of eye irritation. It provides relief from eye redness and discomfort by restoring the normal blood flow to the eyes. Zincula Eye Drop is for external use only. Follow the instructions given by your doctor and use this medicine regularly to get the most benefit. You should gently squeeze the dropper and place the medicine inside the lower eyelid and wipe off extra liquid.  Always wash your hands and do not touch the end of the dropper. This could infect your eye. Make sure you remove contact lenses if you wear them and wait for at least 15 minutes before putting them back.  Never use a bottle if the seal is broken before you use it for the first time.Dilatation of pupil is the most common side effect of this medicine. However, an overdose may cause a stinging or burning sensation and blurred vision. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. You are advised to avoid driving until you know how the drug affects you or must consult with the doctor if the condition does not improve within 24 hours.Before using this medicine, let your doctor know if you have glaucoma, any other eye disease, or if you have heart disease or have high blood pressure. Your doctor should also know about all other medicines you are taking as many of these may make this medicine less effective or change the way it works. Inform your doctor about pregnancy or breastfeeding at the start of the treatment.