Phentermine
"Started this medicine 6 weeks ago and have lost 10 lbs. I have been watching my diet and walk/jog 2.5 miles 5 days a week with other exercises. I have a hypothyroidism making it very difficult to lose weight. Was on this medicine one other time 1.5 years ago for a month straight and realized that my body is immune to it after one week.  Now I take it 1 week on, 1 week off.  I notice lots of energy and dry mouth and a happy feeling for the first 4 days and then I start feeling sad, which then goes away in about 4 more days. I have also noticed vision changes in my right eye which I plan to see my eye doctor about.  All in all I recommend Phentermine as I would never have lost the weight or had the energy to make the necessary changes."