Drospirenone / ethinyl estradiol
"Began yaz on the 20th of August because I was diagnosed with endometriosis and it caused me to have a 23 day period. 3 days after my period came again for 9 days and it was extremely painful worse than ever before and very heavy. I stopped using yaz at that point and now 6 days after here I am again with a next period heavy and painful. Wish I had never used this drug. Worst experience ever. Hoping to go back to a normal cycle soon because this is uncomfortable."