The Xanax dosent knock you out? You might be better of ask your doc this question, I don't know how your doc is. but in the past I have called the doc office and just asked the receptionist and a note in his messages and then got back to me a few days later with his answer. Apparently its not a good idea to take a pre work out if you are on Adderall but when leg day comes around a seem to forget about that information hehe