> Why do you expect pseudoephedrine to be less nasty on the cardiovascular system than caffeine?

I'm not advocating for substituting pseudoephedrine for caffeine, but rather using pseudoephedrine as a one time proxy for amphetamine to see how well it works for you.

> Recommending going from caffeine to amphetamine comes across as rather weird to me.

With respect for the potential for abuse and addiction, that's a good point. My suggestion comes from a firsthand account of an adult with undiagnosed ADHD who self medicated with grossly excessive coffee drinking. Their doctor suggested getting assessed for ADHD and making the substitution out of fear for their cardiovascular health.

I assumed the parent commenter was overusing caffeine to self medicate for attention issues, but didn't think of the possibility that it was pure addictive behavior.

Amphetamine is no stronger or more treacherous than caffeine, when dosed properly. As someone with EXTENSIVE experience with both, I would say caffeine is probably substantially more treacherous.