"i started phentermine 37.5mg 6/25 /16 my start weight was 248. which is the most i have ever weighted... i gained 100 pounds well pregnant with my daugther. the frist few days i only got 2-4 hours of sleep. but now do get atleast 6 hours. the pill gives me lots of energy. i have not weighed myself yet today is the last day of my 30 day prescription. but i know i have lost i see it in my face,neck,arms. my pants that use to fit me tight now are loose on me that they wrinkle up. and shirts that didn&#039;t fit me now do. i feel awesome. i need to lose a total of 65 pounds to be back to normal. will update tomorrow to see how much i have lost."