i got my room mate some about a year ago. he lost about 15-20lbs in about a month. he did lose some muscle tough. you wasnt using it to get shredded though, just to drop a few pounds, it worked for that..... why not use clen???
You WILL lose some muscle mass while on Phentermine. I loss about 10 lbs of lean muscle while on it, which is A LOT for me. You'd definitely want to take an anabolic if you decide to take Phentermine, although I'd recommend the Clen/T3 or ECA combo for cutting if that's your goal.