What comes after phentermine interactions with one's body? That's a question worth asking before investing in leave alone using weight loss pills. Once you know the details, you make an informed choice which often translates to making the right decisions. That's why this article focuses on various phentermine interactions. It helps you know what to expect after using the prescription. You also get to decide whether your body can handle the reactions. Phentermine interactions have a good and a bad side. The good is the result you get and the things that lead to it, usually losing a chunk of your body weight.