I had been on Yasmin for a couple years then became pregnant. After the baby, my obgyn suggested taking Yaz b/c he said there were less side-effects. So, I began taking it and with in a few weeks time I had began fainting at work, good thing I am an R.N. in the E.R. and was having irregular heart rhythms. I was told I had very low Potassium and began taking K + supplements. Although, no one made the connection to the birth control. I kept telling different doctors that the only new change was that I had begun taking Yaz. They just kept saying I was stressed and my body was still adjusting from a very difficult pregnancy, which was true. So after resuming with Yaz I again started to feel lethargic, muscle spasms, headache and palpitations, I finally have an appointment with my ob and can't wait to switch pills!!!! Yaz is not what is cracked up to be........