Vyvanse is lisdexamphetamine, a slow release version of dexamphetamine.
Don't be mislead by the name, they're quite different. And methamphetamine is very rarely prescribed, only when everything else fails. While Vyvanse is usually first line treatment.
I did not mean to suggest that they were the same substance. Reviews by people with ADHD people who have tried many meds paint a rosy picture of this particular medication. The order in which doctors prescribe things seems mostly unrelated to which things are best for patients.
So I've heard, but I've also heard psychiatrists being very cautious in prescribing Desoxyn. AFAIR Slate Star Codex linked many times in this thread is one of them. And I'm not even sure you can get it prescribed outside of the US.
Methamphetamine seems to be very effective with fewer side effects, but there's a lot of stigma and legal issues with it being one of the most controlled substances. So even if cheap it's not going to be easy or convenient to get it prescribed.
Desoxyn is pharmaceutical methamphetamine.
Vyvanse is lisdexamphetamine, a slow release version of dexamphetamine.
Don't be mislead by the name, they're quite different. And methamphetamine is very rarely prescribed, only when everything else fails. While Vyvanse is usually first line treatment.