[willsun]

Certainly abuse and addiction management has improved since the 1960s - but companies have struggled to get more stimulants to market because of other side effects as well (e.g. fenfluramine was quite effective, but withdrawn in the 1990s since it was found to cause heart valve disease / pulmonary hypertension). At this point, broader adoption of medications seems to be blocked by a combination of physicians choosing not to prescribe, payers unwilling to pay (e.g. $300/mo indefinitely), and patients who don't like the non-trivial side effects of existing options. Perhaps future drug discovery will alleviate these issues.