birth control
"I was on Gianvi for about five years with minimal issues until I developed bilateral pulmonary embolisms (blood clots in my lungs).  The only thing that the doctors could find as to why I developed the blood clots was my birth control pill (Gianvi).  After doing some research after the fact, I discovered that the hormone used in Gianvi, drospirenone, makes you more likely to develop blood clots as compared to other birth control pills that do no have drospirenone.  I would have not taken this pill had I known that I had a higher chance of developing potentially deadly blood clots."