not so sure about that. when taken in the prescribed doses, amphetamines have no side effects that persist after cessation of treatment. They're among the safest prescribed substances on the planet.

Amphetamines aren't used for creativity. They more accurately could be characterized as "reducing the activation energy for entering (and resuming) the focused state needed for a task".

quitting caffeine by contrast, will cause terrible headaches and a shitty mood for a at least half a week.