Sure, in the same way that rubbing alcohol is basically vodka.

I'm sure you didn't mean anything by it, but it's frustrating to hear this line over and over as someone who needs these prescriptions to function.

No.

Adderall is normally prescribed in the XR formulation (meaning it's an extended/slow release capsule), and has amphetamine as the active ingredient.

Methamphetamine is a different molecule altogether, and typically it's not packaged in slow-release capsules.

Yes, methamphetamine is structurally related to amphetamine, but you shouldn't make the mistake to think they are interchangeable. Very often the difference between two very similar molecules is the difference between life and death (for a classic example, look up the two enantiomers of thalidomide).

They are very similar, but the euphoria with Adderall is significantly less than with meth or other speed you'd buy on the street. For some people meth might be an effective substitute, but I think most people would find the high and the side-effects too distracting. Plus, that euphoric high increases the likelihood of abuse and addiction.

I'd add that the people I've known who did a lot of meth tended to have physical health issues and looked like shit, which was not the case with the people I've know who abused Adderall.

No. That's like saying methanol is basically ethanol. Sure they are chemically similar, but the differences are distinct and very important.

This still blows my mind: https://www.goodrx.com/desoxyn

Meth is apparently prescription meth.