"i have been taking phentermine for about 5 months now. i am on a six month prescription with monthly visits to my doctor to have bp and pulse monitored. i have lost 37 pounds so far in the past 5 months. i do drink only water and i exercise on a treadmill when i have time (not a lot). i do have side effects such as chest tightness, anger when the meds wear off, and my hair has become thinner (i heard the phentermine would do that). overall i think i have had a good experience with this medication and it has helped me gradually lose weight."