I take Aviane for the cists I have on my ovaries. I use it in a way that makes it so I only have 4 periods a year which is once every 3 months. When you are taking birth control there is no medical need to have a period every month. Every woman will agree that periods suck so if you can make it so you 8 fewer periods a year why not do it! And if you do use it for birth control it is 99% effective. I haven't had any side effects from Aviane. No weight gain, no mood swings, nothing. It is normal to have spotting for the first three months of taking Aviane but it does stop on the fourth month. I would recommend this product to anyone with ovarian cists or for contraceptive.