"this is my second time on phentermine. the first time i changed nothing and lost 20 lbs. that was in 2012. i kept the weight off after i stopped the meds, too. but i had a baby via c - section in november and i&#039;m only down 2 lbs after gaining almost 30. diet and exercise didn&#039;t cut it. i tried other things first but finally got back on phentermine thursday (may 7) after realizing i just kept gaining and that i&#039;ve crossed the line of overweight and am teetering on obesity. i weighed 171 on thursday and i weigh 167 today (may 9). i&#039;m on a high protein diet but few changes otherwise (so far). the doctor has my goal weight at 148. last time my regular doctor prescribed it, but this time it&#039;s a dietician and i love all the additional info."