Inhibitors targeted at AChE in the CNS

Several inhibitors of AChE have been developed for use in treating Alzheimer's disease, which requires that the drugs readily enter the CNS. These inhibitors are structurally unrelated and vary in their mechanism of inhibition, although all are reversible inhibitors. Tacrine (Cognex) is a monoamine acridine. Donepezil (Aricept) is a piperidine derivative that is a relatively specific inhibitor of AChE in the brain, with little effect on pseudo-ChE in the periphery. Galanthamine (Reminyl) is a tertiary alkaloid and phenanthrene derivative extracted from daffodil bulbs that is a reversible competitive inhibitor of AChE; it also acts on nicotinic receptors.

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