The best person qualified to answer that question would be your doctor or pharmacist.
I have heard about ladies on here that changed to the 40mg and did a lot better. We are all different and react different to Duromine. Some people can only tolerate the 15mg and still have bad side effects while others do superb on the 40mg without any problems. Let's hope you are one of those lucky ones!
And also remember to eat well and adjust your diet.