Optihist AZ Eye Drop contains Azelastine 0.05% w/v, a potent antihistamine used for the treatment of allergic conjunctivitis. Azelastine is a selective histamine H1 receptor antagonist that effectively inhibits the release of histamine and other mediators from mast cells, thereby reducing ocular itching, redness, and swelling associated with allergic eye conditions. This ophthalmic solution is indicated for the relief of symptoms such as itching, redness, and watery eyes caused by seasonal or perennial allergic conjunctivitis. Optihist AZ Eye Drop provides rapid onset of action, typically within minutes, and offers sustained relief with twice-daily dosing. The formulation is designed to be well-tolerated with minimal systemic absorption, reducing the risk of systemic side effects. It is suitable for adults and children over the age of three. Patients should avoid contact lens use during treatment unless advised otherwise by a healthcare professional. Common adverse effects may include transient burning or stinging upon instillation, bitter taste, or mild eye irritation. Optihist AZ Eye Drop should be used with caution in patients with hypersensitivity to azelastine or any component of the formulation. Consultation with an ophthalmologist is recommended if symptoms persist or worsen.