Ok, thanks. IIRC, the exact mechanism for piracetam isn't fully understood either (something involving acetylcholine) - they decided to create the "nootropic"

Ok, thanks. IIRC, the exact mechanism for piracetam isn't fully understood either (something involving acetylcholine) - they decided to create the "nootropic" designation for it rather than classify it as a stimulant. The general consensus is that it's safe (no known LD-50, relatively mild side-effects) and makes orange juice taste horrible.