"i started phentermine 4 months ago and have lost close to 40 pounds. it is basically a magic pill that allows the weight to just fall off completely. there are bad side effects, however. the first couple of weeks are great. i felt like i was unstoppable. you have so much excess energy and your body just won&#039;t stop. if you don&#039;t take the pill really early in the morning, you will be up all night long. you are never hungry so you may even forget to eat. i have had really bad headaches, blurred vision, and occasionally upset stomach. "