<prompt> why do GLYCOPYROLATE is used as pre-anesthetic medication ?no central effect as it do not cross BBBas it have few side efectsas it increases pharyngeal secreationno post surgical complications  <response>: Actions of glycopyrrolate are similar to atropine except for some differences,as given below.. CNS-minimal CNS effects. CVS-increased hea rate is to a lesser extent and for shoer duration than atropine,hence ,lodynamic sLao.ay when used as premedication. Similar actions on RS,GIT,GUT and other smooth muscles and glands as atropine. 2 times more potent rntisialogoguE than atropine. ref : kd tripathi 8th ed 