I was using yaz for a full year. It has been the best birth control I have ever used! I lost approximately 40 lbs over the course of the year. I never had PMS, my periods were shorter and lighter. I didn't experience any cramping or bloating, and that is saying something because normally my cramps are equal to labor pains. And on top of that it cleared up my acne. I dont have acne except right before my period and its very light and minimal, but Yaz got rid of it completely. Yaz is my miracle drug. But of course it will effect different people differently. So just talk to your doctor.