"i&#039;m 50 yrs. old and just started phentermine 37.5 mg. 2-16-16.  it&#039;s just been 4 days and i&#039;ve already lost 14lbs.   i&#039;m 5&#039;8 and started at 320lbs.  i wanna get down to 145 so i have a long weigh to go but so far.  wow!  the only side effects so far is dizziness, jitters, constipation and, slight headaches.  all of that i can deal with because this pill is working so far.  will update in a month or so... t.l.b. in ga"