Yaz, Yasmin and Ocella are combination birth control pills that contain a chemical progestin called drospirenone. Drospirenone has been associated with a number of very dangerous and potentially fatal side effects. Drospirenone is a diuretic with antimineralocortoid properties that can cause hyperkalemia and lead to thrombosis. Drospirenone can make the potassium levels in your blood go to dangerous levels and cause potentially life-threatening blood clots, stroke, pulmonary embolism (PE), deep vein thrombosis (DVT), gallbladder disease, liver or kidney failure, sudden cardiac death, and a number of other serious medical problems. The drospirenone contained in Yaz, Yasmin and Ocella is not used in any other combination oral contraceptive on the market in the United States.