Just want to echo someone else's sub-thread:
Adderall is not at all similar to Huxley's description of Soma. Soma was about feeling good and not having to think of the evil things that make the BNW society possible, not efficiency.
That's also what I thought - Wasn't Soma more of a way to make people question less and just remain in a blissed out but maybe sort of out of it state at all times ? Seems very different than amphetamines