"i have been on phentermine 37.5 now for a month. prior to taking phentermine i have tried everything! exercise(tae kwon do, p90x *with trainer* and insanity *with trainer*), changed my diet, did everything i could to lose weight. nothing helped! after finding out i had an hypothyroid doc put me on some meds, and also put me on phentermine 37.5. so after the 1 month of being on this, i have gone from 338lbs to 311lbs.  at the beginning the side effects were bad! always felt drunk, sweat all the time, couldn&#039;t sleep, and always *even now as i type this* having a dry mouth! i have no hunger, and only know i am hungry when my stomach hurts. so, this works... just be ready for a roller coaster ride in the beginning. good luck!"