"first 10 days of taking belviq, no difference except generalized muscle aches. then the &#039;switch&#039; came on. weight started falling off. did not change lifestyle @ all.  i didn&#039;t excercise &amp; didn&#039;t start. lost 20 lbs in approx. 3 months. kept wt. off 1 yr.  after 1 yr., belviq seems to have stopped working. have put 10 lbs back on.  has it stopped working after months. for anyone else. loved it &amp; want it to work again for me."