Alarid 1 mg Tablet is an antihistamine and mast cell stabilizer manufactured by Square Pharmaceuticals Ltd., Bangladesh. Its active ingredient is Ketotifen Fumarate, which is effective in preventing and treating allergic conditions such as bronchial asthma, allergic rhinitis, conjunctivitis, hay fever, and urticaria (hives). Ketotifen works by inhibiting the release of histamine and other inflammatory mediators from mast cells, thereby reducing allergic symptoms. It also possesses antihistamine properties, providing relief from allergic reactions.