"i started phentermine, prescribed by my primary care physician, and it has been nothing short of amazing in my case.  i started taking it at 372.4 pounds. within a matter of 4 days of taking the medication i noticed a huge change.  this gives me energy, and makes me feel not hungry at all.  in 5 days, i lost  11.3 pounds.  i don&#039;t have any of the nasty side effects that everybody mentions, but medications affect people differently.  i take the phentermine every day at the same time, and am already noticing a difference.  along with not making you feel hungry, when you do eat, it makes you feel full.  fast."