I am a pain patient and have been taking oxycodone IR for a few years. I take six 30 mg pills a day. I have gained a lot of weight from back issues. Dr prescribed phentermine 15mg to help with weight loss, I am scared to take phentermine with my pain meds, would like to know if anyone else is prescribed both together and how well they are tolerated. Dr said she will monitor me knowing I'm on both medicines.