"i have been on belviq for 5 days and i&#039;m down 2 pounds...my starting weight on monday was 251 and now i am 247.  i have cut back on eating due to not feeling hungry all the time so that helps me count calories so i don&#039;t over eat but i will say that you need to make sure that you eat breakfast in the morning.  don&#039;t forget to download myfitness pal to help. side effects: i had a headache, drowsiness/dizziness the fist day but that seem to wear off the first day or so. good luck everyone and i will keep you updated on my weight loss. adding exercise this week everyday!!"