"i love phentermine; i weighed 198 last jan. 2010 and i started phentermine on and off. i also experienced that it works the best at first....then it slows down... so i try to get off of it and then start back. it really does make you moody but you really get a lot done and you have the get up and go mode and that&#039;s what i want.  i have lost down to 161lbs now but it&#039;s been a year and i also stopped eating bread and potatoes so i think the combination is what does it. i feel better than i have felt in a long time and i used to starve myself and suffer walking in the 90  degrees pushing a baby in a stroller and not lose hardly anything. so yes this definitely works. i love mine and have to have them to keep my weight down."