"during my appointment with my dr on february 11-2017 for a refill of my chronic pain meds and to seek a better solution for my sleeping pills i weighed in at 296, i asked my dr if she would give me something that would help curb the appetite. i started phentermine the next day. it is now march 18-2017, i now weigh 271. it works but you need to drink water and lots of it. i am now experiencing severe constipation. the medical guidelines say for short time use and i see why.  if i were able to workout i&#039;m sure i would be losing more weight."