All of the following antihistaminics can be used topically except:: (A) Ketotifen, (B) Levocetrizine, (C) Olapatadine, (D) Astemizole
Answer is B. Azelastine, Astemizole, Ketotifen, Olapatadine are the antihistaminics that can be used topically in allergic rhinitis and conjuctivitis.