I do believe concerts is a stimulant. There are some ADHD meds that aren't though. I don't know the names of them. Other stimulant type meds that release norepinephrine can cause anxiety also. Like Welbutrin or effexor/pristiq. Welbutrin is stimulant-like. It is like a chemical cousin to phenylalanine. So I believe the overall combination of things can have an impact when taken with stimulant ADHD meds. This also includes over the counter stimulants like caffeine, theobromine, yohimbe and it's extracts, citrus auranimum, ephedra, and some other things that are in energy drinks and pre-workout supplements. It's just a good idea to make sure you know about everything you're taking. Just my humble opinion.