It sounds too good to be true. Until now, all progestins available in the United States were derived from testosterone. What sets Yasmin apart is that it contains a new type of progestin called drospirenone. Drospirenone is related to the diuretic spironolactone, and acts more like the natural progesterone found in the body.
Estrogen tends to cause salt and water retention.
For many women this means bloating or even weight gain. Like natural progesterone, drospirenone can help offset the fluid retention and bloating that's common among women using birth control pills. However, Yasmin isn't right for everyone. Drospirenone can increase potassium levels in the blood, so women who have kidney, liver or adrenal disease should not take Yasmin. Women using these medications on a regular basis may need to have potassium levels monitored while taking Yasmin.