"i am 41 years old and have been taking phentermine as of september 2, 2008 to december 20, 2008. i have lost 35 pounds. it has been a huge blessing in my life. i went from a size 20 pants and 2x or 3x tops to a size 10 pants and from large to medium tops. it is awesome. it has been a great experience but be sure to see a doctor before taking this medication. the side effects i experienced were dry mouth (i chewed sugar-free gum all of the time and drank lots of water) and constipation. it seems to get better after being on the pill for awhile. energy (treadmill 5 to 6 times a week and get this - i love it). i&#039;m taking a three week break right now. i&#039;ll let you know how it goes. good luck."