But the one 4-MAR/Aminorex typre drug We now have noticed is four,four-Dimethylaminorex, and that was answerable for quite a few deaths. We know from phendimetrazine that substitutions over the Nitrogen reduce the potency or have to be demthylated in vitro making it a prodrug.Aug 18, 2015 #3 This does worry me a fair bit as I've been using the stuf