"i know phentermine works for different people in different ways. when i first started phen37.5, july 7th. i felt no extra energy. appetite suppressed very little, dry mouth and a small headache. i started at 199, and now down to 194. (5 pounds?!) not much weight loss in 12 days. i drink only water, some with added lemon to it. calories are about 1200-1300. healthy foods, like chicken, fish, apples, banana, salad, tuna as examples. i take it about 8-830 am. side effects thus far are, dry mouth, headache mid day, lack of sleep. (insomnia) a little disappointed in results this far. i forgot to add, i also exercise 4 days a week doing walks, brisk walks, and exercise bike totaling 2 hrs. day. there should be no reason i&#039;m not losing more :("