Alarid 0.025% Eye Drop is an anti-allergic ophthalmic solution manufactured by Square Pharmaceuticals Ltd., Bangladesh. Each milliliter contains Ketotifen Fumarate 0.25 mg, a potent anti-allergic substance that possesses a powerful and sustained non-competitive histamine (H1) receptor blocking property. Ketotifen inhibits the release of mediators (e.g., histamine, leukotrienes, and prostaglandins) from cells responsible for type-I allergic reactions. It also stabilizes mast cells, decreases chemotaxis, and activation of degranulation of eosinophils