I am taking phentramine 37.5 @ 1.5 pills a day and I am noticing that the effects are starting to wear off. I have been on it for 9 weeks and have lost 48 pounds. I am thinking of switching meds, has anyone else had this problem? I wish I felt the way I did when I first started taking the meds, but now I feel like it is harder for me to go without eating. thanks for your help!