ketotifen, histamine h1 receptor blocker molecule. it is used to treat atopic asthma, allergic conjunctivitis. molecular model. 3d

alcaftadine allergic allergy antihistamine asthma atom atomic ball carbon chemical chemistry conjunctivitis conventional fever formula histamine hydrogen illustration itchy ketotifen lastacaft loratadine molecular molecule neurotransmitter nitrogen ophthalmic organic oxygen render rendering rhinitis structural structure urticarial