The US Drug Watchdog group says millions of women are using Yaz without being fully aware of the drug's potentially dangerous side effects.
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According to the group, Yasmin contains less estradiol than Yaz, but that particular component does not cause the drug's side effects, which include blood clots, heart attacks and gallbladder problems.
Other side effects associated with Yaz and Yasmin include nausea, stomach cramps and weight gain.
The group is hoping that woman who have experienced the drug's side effects will post their experiences on various social media outlets.