"am on my 8th day of taking phentermine, and i have lost 10lbs. i had a little trouble getting to sleep the first  day, 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 189 and i am now down to 179 for a goal of 160-165 i am finally feeling strong enough to do the stepper at the gym for a longer period of time. i am so impressed with the medication from my dr."