Not that i know of. Start slowly and work your way up to a comfortable dose. There are many different types of amphetamines, so it could be possible that some amp. might interact negatively, even though i doubt it. The reason i think you'll be fine is because i know many people who have taken DMAE supplements and ephedrine together and since eph. belongs to amphetamines and they were fine i'm sure you will be too. Just keep the doses reasonable.
PS. I also checked from drugdigest.org (just in case) and there were no negative interactions.