1. Are there any actual differences in CNS stimulant effects between dextroamphetamine (Dexedrine) and dextromethamphetamine (Desoxyn), except for the increased potency per mg of meth (due to increased lipid solubility)? Is it true that Desoxyn gives clearer thoughts and more "control" and at the same time less side effects or is that just placebo?
2. Why is meth neurotoxic when un-methylated amphetamine does not seem to be?
3. Is there a lower limit of blood plasma concentration for methamphetamine neurotoxicity? Is 20-60 ng/mL completely safe as indicated here or did I get something wrong?