all I know is 3+ doctors & 3 + pharmacists I know in real life and have known for years have all said that generics are at least 20% less potent & depending on the manufacturer and or country they come from maybe more. and there was something about different cheaper binders or something being used also on generics. I just know me, myself can tell the difference bwteen a generic Valium and name brand and generic hydro vs name brand is all I know. I have never had Xanax so dont know sorry