Many women who have taken this drug have alleged that they have suffered from serious health risks because of an ingredient in the drug called drospirenone.  According to the FDA, it is alleged that this ingredient can lead to hyperkalemia, which is a medical condition caused when potassium levels in the blood are elevated.  This condition allegedly can result in serious heart, kidney, and liver problems.  Furthermore, many women who have begun to file suit against Bayer have claimed Yaz can cause blood clots, allergic reactions, rash, hives, breathing problems, fainting, irregular heartbeat and chest pain, as well as liver and heart failure.