<prompt> Which of the following is NOT an alpha adrenoceptor agonist?ClonidineMethyldopaGuanabenzGuanfacine  <response>: Ans. B MethyldopaRef: KDT 8the p612Methyl dopa itself is not an a2 agonist but it is converted to an active metabolite a-methyl norepinephrine which possesses a2 agonistic action. All other drugs listed in the question are a2 agonists for the treatment of hypertension. 