"i started taking phentermine 37.5 mg on monday 11-7-16.   i have felt no change in my body.  i do not have dry mouth, racing heart beat.  i don&#039;t have a lot of extra energy.   i am still hungry.   i am hoping the pill will &quot;kick&quot; in to help me.  i weighed in at 222.9 lbs at 5&#039;4, on monday.  i have not lost any weight yet.  my doctor prescribed this medicine to help me.  i am a little discouraged right now, but will stick with it until i see her again in 4 weeks."