Alphagan Eye Drops 5ml is a combination medicine used in the treatment of open-angle glaucoma or ocular hypertension. This medicine contains brimonidine and benzalkonium chloride which works by decreasing the production of aqueous humour, thereby helping lower the increased pressure in the eye. Common side effects include blurred vision, eye redness, discomfort, drowsiness and dry mouth. Avoid driving vehicles and operating machines as it may cause blurred vision