<prompt> Ranitidine differs from cimetidine in the following respect:-It is less potentIt is shoer actingIt does not have anti-androgenic actionIt produces more CNS side effects  <response>: Cimetidine is rarely used now because: It is the least potent H2 blocker It is a sho acting agent It is a potent inhibitor of microsomal enzymes It can cause gynaecomastia It produces more CNS adverse effects 