"over 4 months ive lost 23 pounds with saxenda. compared to a 2 month regimen of 15 pounds with phentermine. i feel saxenda is better because there are no noticeable side effects like you get with phentermine. i did not have energy bursts with the sudden crash, increased heart rate or difficulty sleeping like phentermine causes. also, after 2 or 3 months, in my experience, phentermine stops working. saxenda is still effective for me. hope this helps."