"i have been on phentermine 37.5 before to help me loose weight. i have weight loss surgery over 2 years ago. lost 63 lbs. md gave it to me to help with the last 20 lbs. goal was 150. i have never been small, but wanted to loose the weight because of diabetes diagnosis.  i took phentermine for 3 days , couldn&#039;t tolerate the nervous side effects and gidderness. i tried to decrease it to half a tab, but it didn&#039;t seem to help with my appetite.  i have gain approx 10 pounds back, tried to loose it without any luck. i thought i would try phentermine again, but too afraid to because of the nervous feelings. "