H1 blockers are useful as: March 2013: (A) Antacids, (B) Anti-allergic, (C) Anti-asthmatics, (D) Anti-migraine
Answer is B. Ans. B i.e. Anti-allergic H1 antagonist is a histamine antagonist of the H1 receptor that serves to reduce or eliminate effects mediated by histamine, an endogenous chemical mediator released during allergic reactions.