<prompt> Answer this question truthfullyWhat are selective muscarinic antagonists, and how can they be used to reduce the side effects of cholinesterase inhibitors?  <response>: <reason> Selective muscarinic antagonists, such as glycopyrrolate, hyoscyamine, and propantheline, can be used to reduce the side effects of cholinesterase inhibitors where they are mediated by activation of muscarinic receptors. 