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Buy Yaz is a progestin (drospirenone) and estrogen (ethinyl estradiol) combination birth control pill used to prevent pregnancy. This medication works by preventing ovulation (the release of an egg from an ovary) and by causing changes in the mucus of the cervix (making it difficult for sperm to penetrate into the uterus) and in the endometrium (making it difficult for an egg to implant).
