"i started using the 37.5mg phentermine on dec 1, 2015.  it is now dec 4 and i am down 5 pounds.  my doctor told me to start at half a pill for the first 4 days so i haven&#039;t even experienced a full pill a day yet.  i take it around 7:30am and it lasts all day.  my appetite is completely gone - i have no taste for any food so i have to force myself to eat something.  i do get very dry mouth though and my heart races all day. and although i have energy during the day i do get tired around 8pm.  i haven&#039;t even incorporated any work outs yet so i can only imagine how fast it will come off once i start adding workouts.  i drink more water due to the dry mouth so that is a good thing.  nothing has ever worked like this before.  the best!"