<prompt> Drug used in alzheimers disease are all EXCEPT:BiperidinDonepezilRivastigmineMemantine  <response>: Ans. a BiperidinRef.: Harrison 19th ed. 2601-02Alzheimers disease is most common cause of dementia.Drugs Used in the Treatment of Alzheimers are: Acetycholine esterase inhiitors: Donepezil Tacrine Galantamine Rivastigmine: Carbamate derivative of physostigmine Memantine: NMDA glutaminergic antagonist Biperidin is an anti cholinergic drug used to treat parkinsonism. 