I wouldn't use Adderall to deal with benzo wd's, that just sounds like psychosis out the ass, but they are fine to take together. And, Klonipin can help with Adderall comedowns, too. The whole upper-downer dangers are misunderstood and frequently exaggerated. IV'ing amps or coke with loads of opiates is a different story, for once the stims wear off, the opiates can cause fatal respiratory depression if you have taken a fatal dose of opiates that is. But, no, mixing amphetamines and benzos is quite fine, and rather common.