"i started taking phentermine 37.5 mg jan. 21. i am a 51 yo female, 5&#039; 3&quot;. on that day i weighed 193 lbs. weighed in again today and i was 177. so far so good. i am eating between 900 and 1200 calories a day. very lean and nothing complex. yogurt, salads, chicken, slimfast meal replacers, steal cut oats, lost of fruits and veggies. since jan. 21 i have only had pasta and rice 4 times. i drink a lot of water! i walk on the treadmill for 30 minutes a couple of times a week. i hate working out in the winter time. as for side effects: at first i had a hard time sleeping. my mind would race...felt like i was on speed. now it is just always thirsty and now and again i clinch my jaw way too tight. very happy with my progress."