I've been taking Phentermine for a few months. Was able to control my eating and have lost about 25 pounds. In the last couple weeks I seem to have gotten my appetite back while on the medication. I really hate the idea of meds to lose weight, but I had lost all self control and needed to make a change in myself - weight, lifestyle, etc. I don't want to increase the dosage which I know will be my doctor's suggestions. Has anyone else on Phentermine experienced this? Does your body build up a resistance to it's effects?