Olopat Eye Drops 5 ml belongs to the ‘antihistamine’ class of drugs, primarily used to treat signs and symptoms of seasonal allergic conjunctivitis and nasal allergy. It is used to relieve itching, burning, redness, watering in eyes caused by allergic conjunctivitis. Olopat Eye Drops 5 ml also treats symptoms of congestion, sneezing, and runny nose caused by seasonal allergies. Allergic conjunctivitis is termed as an inflammation of the conjunctiva caused by an allergic reaction. Conjunctiva is the clear tissue that covers the white part of the eye and the inside of eyelids. Olopat Eye Drops 5 ml contains Olopatadine, which is an antihistamine drug. It inhibits the release of histamine from mast cells. Histamines are chemical messengers that are released due to an allergic response in the body. These chemicals are known to cause allergies like runny nose, sneezing, and itchy eyes. Olopat Eye Drops 5 ml is available in the form of a tablet, ophthalmic solution (eye drops), and nasal spray. Your doctor will advise on how often you take Olopat Eye Drops 5 ml based on your medical condition. Some common side effects of eye drop formulation of Olopat Eye Drops 5 ml include headache, blurred vision, burning/stinging/redness/dryness of the eye, eyelid swelling, and eye discomfort. The nasal spray form of Olopat Eye Drops 5 ml may cause side effects like nausea, dry nose, dizziness, runny nose, and taste changes. The tablet form of Olopat Eye Drops 5 ml may cause side effects like sleepiness, weakness, dryness in the mouth, hypersensitivity. These side effects do not require medical attention and gradually resolve over time. Although not all of these side effects may occur, they may need medical attention if they do occur. Please do not use Olopat Eye Drops 5 ml without consulting your doctor if you have any heart, liver and kidney diseases, and allergic reactions to Olopat Eye Drops 5 ml and its components. Avoid touching the dropper with bare hands or taking it closer to the eyelids while administering drops, since it contaminates the dropper tip and solution. If you wear contact lenses, please inform your doctor since Olopat Eye Drops 5 ml, and its additives like Benzalkonium chloride may change the lens's colour. Olopat Eye Drops 5 ml sometimes may make your eye red after administration; in such cases, please avoid wearing lens until the eye becomes better. Please do not use a nasal spray of Olopat Eye Drops 5 ml while using depression medicines since it reduces alertness and may cause central nervous system impairment. Olopat Eye Drops 5 ml is not recommended during breastfeeding unless it is necessary. It is advised to check with your doctor before using Olopat Eye Drops 5 ml if you are pregnant, currently breastfeeding, or taking any other prescribed or non-prescribed medicines. Avoid driving or operating machines since the administration of eye drops of Olopat Eye Drops 5 ml cause blurred vision for a while after using. Alcohol consumption may also reduce the effectiveness of Olopat Eye Drops 5 ml, hence limit or avoid its intake during the course.