I was already overweight but needed to get my pain under control when I was put on this patch 3 months ago. After a month I went on phentermine to lose weight( I lost alot of weight b4 on it & kept it off, but my primary wouldn't refer me until pain was under control) & every month I have been back I have gained weight, in fact the dr said this last time did you come to me to gain. He ran all kinds of tests and couldn't find a reason. I'm up 15 already, has this happened to anyone else?