I've never heard of MAT, but I googled lisdexamfetamine. It's a drug for ADHD.
Would it act like a maintenance med for tweekers/speed freaks? I've never been into uppers unless it's IV, though I'm sure I'd give meth a shot(hehe) if I could ever get my hands on some decent shit. There is a shit load on the tribal reservation where I live. hhmm....