I used to be on it for ADHD. I lost about 20lbs in the first few months I was on it because it suppressed my appetite so much.
It was great for focus and emotional suppression (though I didn't realize that at the time). I switched to Adderall because of insurance - it worked almost the same for me. I weaned myself off it almost a year ago now. The stimulant effects became too much for me as my therapy progressed.

Eta: it made me clench my teeth like a madwoman. Made my jaw ache...

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