"i&#039;ve been on belviq for a week and notice the difference already. i can fit a pair of jeans that i had difficulty buttoning 2 weeks ago. i eat 2 to 3 times a day and in small portions. i&#039;m not hungry most of the time. i have experienced some of the minor side effects...headaches, constipation, and dry mouth. the plus on that is i&#039;m drinking a lot more water and completely staying away from juices and soda."