<prompt> All are cholinergic agents except -GalantamineDonepezilTacrineMemantine  <response>: Ans. is d i.e., Memantine Cognition Enhancers Cerebroactive drugs o These are a heterogenous group of drugs developed for use in dementia and other cerebral disorders. o Drugs are 1. Cholinergic activaters -- Tacrine, Rivastigmine, Donepezil, Galantamine. 2. Glutamate NMDA antagonist --4 Memanite 3. Miscellaneous -- Piracetam, Pyritinal pyrithioxine, Piribedil, Dihydroergotoxine Codergocrine. 