"started phentermine on september 6, 2013 weighing at 183.5lbs. i had my appointment at my doctors today and i weighed in at 164.4lbs. i have lost close to 20 lbs in 1 month. i am taking the 37.5 mg pill in the morning and 1/2 at noon. side effects are dry mouth but i drink lots of water, which is good for me anyway. my goal is 135 lbs and i work out 1 hr 5 days a week."