55yr old man with dementia was given a natural alkaloid which of the following?
Tacrine
Donepezil
Galantamine
Rivastigmine
Ans. is 'c' i.e., Galantamine Galantamine: It is a natural alkaloid which selectively inhibits cereral acetylcholinesterase and has some direct agonistic action on nicotinic receptors as well. It has produced cognitive and behavioural benefits in alzheimers disease.