"this is the 2nd time i&#039;ve used this medication the first time i didn&#039;t exercise eat better or keep track of my weight though i know i did loose weight.this time around im getting my money&#039;s worth since i pay for it out of pocket. i started on phentermine 37.5 on may 18 2015 i also got the b12 double shot which i paid an additional $20 for i get these every 7 to 10 days. on may 28 my weight went from 274 to 261 ,,that&#039;s 13 lbs lost. i exercised 3-4 days i am not changing my eating habits drastically but i am eating better phentermine helps a lot. i loose motivation at times but i keep coming on this site to remotivate myself. i plan to see my doc in a couple of days for another weight in. i am a 25 yr old female and am 5`7."