Alphagan P Drops 5 ml is an ophthalmic medication used in the treatment of ocular hypertension and glaucoma. This medication functions by reducing the amount of aqueous humour (ocular fluid) produced, thus aiding in lowering eye pressure. You may experience common side effects like watery eyes, irritation, abnormal taste, and abnormal vision. Avoid driving vehicles or operating machines as it may cause temporary blurred vision.