Olopatadine hydrochloride is an antihistamine and mast cell stabilizer medication commonly used to relieve symptoms associated with allergies, particularly allergic conjunctivitis (eye allergies). Olopatadine hydrochloride is available in various forms, including eye drops and nasal sprays. Olopatadine is sold under brand names such as Pataday, Patanol and Pazeo.Olopatadine works by blocking the effects of histamine, a chemical released during an allergic reaction that causes inflammation and allergy symptoms. Buy high quality Olopatadine Hydrochloride from Chemicea Pharmaceuticals. Chemicea Pharmaceuticals is one of the leading manufacturer and exporter of Olopatadine Hydrochloride