Strong brotelligence in this thread.
Amphetamine is not methamphetamine
Amphetamine= Alpha Methyl Phenylethylamine
Methamphetamine= N, Alpha Dimethyl Phenylethylamine
For contrast:
Ephedrine= N, Alpha Dimethyl Beta Hydroxy Phenylethylamine
Is ephedrine meth? No, its not. But it is very chemically close.
(The perscription name for D-Methamphetamine is desoxyn, short for desoxy ephedrine)
Furthermore the levo and dextro isomers of these compounds produce significantly different effects. In both cases The D-isomer is more psychoactive, which is why more ADD drugs are being standardized to just the Dextro, rather than the racemic DL-mixture seen in adderall.
Don't believe me? Go to your nearest Walgreens, look around for the vicks nose inhalers, the active ingredient is L-Methamphetamine, but they use strange nomenclature so that kids dont say "hey its meth" and eat the cotton. If any of you are foolish or bold enough to crack open the inhaler and eat the cotton, you will see that you are definitely not "tweaking".
With regards to muscle loss, it would be foolish to say that something that blunts your appetite, increases caloric expenditure, and increases cortisol might not have negative effects on muscle building, but as you stay on the drug, you become accustomed to the effects, theres no exact number but I play it safe and say 200 calories over whatever maintenance is when taking ADD meds. Which is entirely possible if you're not using the drugs to get "speedin" and completely naive to the effects of amphetamine.
In summary, I would caution against spouting out something you heard as fact, it makes you appear ignorant, amphetamine is not an evil chemical because it shares 11 letters with methamphetamine. Because of its effects on neurotransmitters (as an earlier poster pointed out) it is not a drug to mess around with, its not just a simple energy pill. Do not treat it as such.
P.S: 30mg Vyvanse qd AM has significantly improved my ability to focus, reduced my irritability, and made me a more social and confident person.