"i have been on belviq for 1 month.  the first day i was extremely tired and weak.  no other symptoms!  i have lost 5 lbs this month.  i take 10mg belviq 2x a day have been taking 30 mg of phentermine in the middle of the day last few weeks.  prior to this i was on phentermine 37.5 mg twice a day and was able to lose and keep off about 30 lbs.  you still have to work at it to lose weight with this drug, it just makes things a little easier.  within the first few days i could tell i was eating smaller portions and getting full fast. i have 15 pounds to lose to get to my goal weight so my weight loss is slower than someone with more to lose.  usually i will lose 1-2 per month so i am very happy with 5 lbs!  it is expensive but its worth a try."