"i took phentermine for 60 days starting in january. i lost a total of 29lbs during that time. was still hungry and no increased energy. had dry mouth and headaches. i stopped in march and it has been about 60days since then, i have now lost a total of 55lbs. so almost the same amount off as on. i&#039;d rather work out every day and eat better without the medicine. i feel that if i hit a slump and stop losing, i might go back on it."