Phentermine
"I have been on this for 4 months and have lost 18 lbs.  I think I have stalled because I am not sleeping due to taking it too late.  I also only had about 40 lbs to lose so I'm thinking it may be slower compared to people who want to lose more.  My biggest concern is absolutely no one can tell that I have lost anything at all!! This makes me think that I've lost all muscle and no fat.  How could 18 lbs not show?  I haven't worked out but am going to start to this upcoming week.  Has anyone else had this problem?"