I take Adderall for ADD and supplement it with coffee throughout the day. I ran out of Adderall once and my ass was seriously dragging, so I figured an OTC caffeine pill would be a good substitute. (And really, compared to prescription speed, I didn’t expect mere caffeine could keep up but it was better than nothing.) Um, no. It made me seriously jittery, gave me painful stomach cramps, I felt like hell. Learned my lesson.
Yeah, i ordered a Frappuccino with 10 extra shots once. It felt like that, minus the pukeing.