"i started taking phentermine 37.5mg on may 5 and i have changed the way i eat but mainly just portion control and no sodas and a lot of water. i don&#039;t eat after 8pm and i have lost 6 lbs so far. however i am not experiencing the energy or the appetite suppressing that everyone says. i seem to still feel hungry even after i take the pill. i&#039;m not going to give up - i will give it at least 3 weeks."