The ads wrongly suggest the pills are approved for relieving premenstrual syndrome, the U.S. Food and Drug Administration said in a letter dated October 3, 2008. The ads also minimize the drug's risks, the agency said.   Yaz contains drospirenone and ethinyl estradiol, and is different than other birth control pills because the drospirenone is not the same progestin found in other birth control pills.

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