That stuff is terrible.
I've tried a lot of diet pills, but that one is the absolute worst, the evil of all evils.
I took it for a couple of weeks when I was 20. Up until I practically had a heart attack. I was in my room at the time, and I made it to my bed, I just laid there for about an hour, my entire left side was numb and I couldn't move at all, I could barely breathe. My phone was right beside my bed so I called my mom, crying & freaking out, telling her what was happening. I was extremely close to dialing 911, but the pain subsided.
Oh, and by the way, at the time (and now) I was a very healthy person. No medical conditions, I excersiced, etc..
If you want to lose weight, try Metabolife, even Xenedrine! Stacker 2's are just BAD NEWS!