How do smart drugs work?

Nootropics or "smart drugs" improve the function of the neurotransmitter acetylcholine via muscarinic cholinergic (ACh) receptors which are implicated in memory processes. Furthermore, they have an effect on NMDA glutamate receptors which are involved with learning and memory processes. Nootropics influence neuronal and vascular functions and increase cognitive function, while at the same time providing a natural source of energy to keep you alert and motivated.