"works as far as preventing pregnancy, shorter, on schedule periods, really good for preventing acne, but horrible for weight gain. i literally gained almost 20 pounds when i started taking this. and a lot of people say it&#039;s because it makes you feel hungry more often so you eat more but i&#039;ve had zero change in my diet so it must be something in the hormones. i&#039;ve only been off this birth control for a week and a half and i&#039;ve dropped 9 pounds."