Olaptanol 0.2 Eye Drop is a medication used to treat allergic conjunctivitis, causing red, itchy, and watery eyes. It blocks histamine's effects and prevents allergic reactions. To use, apply 1-2 drops daily, avoiding contact with the dropper. Common side effects include eye pain, irritation, discomfort, weakness, and dry mouth. If side effects persist or worsen, contact a doctor. Avoid driving or using machinery, remove contact lenses, and inform your doctor if you are pregnant, breastfeeding, or taking other medications.