"i have been on phentermine since 9-9-11 and i&#039;m down 10lbs! i had little headache the first week but after that i haven&#039;t had any headaches and i used to get at least 2-3 a week. i have a thyroid problem and was feeling so dead even being on thyroid pills but since i started taking phentermine i feel like me again! and after reading a lot of other people&#039;s reviews i was worried i wouldn&#039;t sleep but i have been getting the best sleep! only side effect i have had was dry mouth and little moodiness (easily irritated from time to time). overall i feel so much better and can&#039;t wait to lose more weight."