Of all the generally available stimulant or weight loss medications available on the net in the US ( I challenge anyone to find dextroamphetamine), I have found phendimetrazine to be the qualitatively the smoothest and least to cause unpleasant nervousness. The compound itself is not psychoactive but a portion of it is metabolized in the body to phenmetrazine - a very fine stimulant and dopaminergic agent that has been unfortunately outlawed for many years now. Phendimetrazine requires a larger dosage m and has a slower impact but is decent. The biggest surprise for me has been the amphetamine derivative clobenzorex available as far as I know in Mexico only. It is mild but the body metabolizes it to the Dextro isomer of amphetamine. In equipotent dosages it's very effective. Benzphetamine is a somewhat related amphetamine derivative with another side chain and a chlorine atom much like clobenzorex but I find it and phentermine to be very irritating and caffeine-like. Hope this will help some. Good luck.