Optilast (azelastine hydrochloride) is a prescription medication commonly used in the treatment of allergic conditions, particularly allergic conjunctivitis. It belongs to a class of drugs known as antihistamines, which work by blocking the action of histamine, a substance in the body that causes allergic symptoms. Optilast is specifically formulated as an ophthalmic solution, designed for topical application to the eyes. It is effective in relieving the itching, redness, swelling, and other symptoms associated with eye allergies. Due to its targeted application, Optilast can provide rapid relief with minimal systemic absorption, making it a preferred choice for individuals seeking localized treatment for their allergic eye conditions.