"female/25: i started phentermine 1 month ago. started at 195 and am now down to 178.  so 17 pounds. i walk/jog/run 5 times a week. usually around 2 miles sometimes more sometimes less. i have taken this medication before about 5 years ago. i got down to 145. i cut down my eating a lot. i try to eat less than 1000 calories a day. it&#039;s usually around 700. for me to lose weight i have to eat a bare minimum."