"hi! i have been on phentermine in the past and lost 32 pounds in less than two months!  then i stopped for about 3 months because itmade extremely constipated. i just started taking it again monday october 28 2013 and today is october 30th and so far i&#039;ve lost 4 pounds in 3 days.  i recommend phentermine to those who truly want to lose weight. it has some side effects but the only one i&#039;ve experienced is constipation so eat healthy and high fiber diet."