<prompt> All are cholinergic agents EXCEPT:GallantamineDonepezilTacrineMemantine  <response>: Ref: KD Tripathi pharmacology 7th edition page.no:489 All these drugs are used in Alzheimers disease. But only A,B,C increase cholinergic activity in Alzheimers. Memantine is a Glutamate Antagonist.it is an NMDA blocker Examples of direct-acting cholinergic agents include choline esters acetylcholine, methacholine, carbachol, bethanechol, tacrine and alkaloids muscarine, pilocarpine, cevimeline 