"i am on my 45th day of taking phentermine, and i have lost 33 lbs. i had a little trouble getting to sleep the first few days, but fine now. it does give you a lot of energy which was one of my problems and does keep you feeling full. my weight when starting was 292 and i am now down to 259 in only 45 days. i am finally feeling strong enough to do the elliptical for a longer period of time. i started taking the drug to help lose weight because my doctor said i was pre-diabetic, and that was a year ago. so i fooled around for almost a year, going on and off diets and couldn&#039;t seem to stick to anything. i never liked the thought of taking pills. but i thought i would give it a try because i didn&#039;t want to get diabetes. happy with it so far."