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99.7%, if taken properly. Women who are overweight or obese have a 60-70% higher chance of it failing than women who are of a healthy BMI (3 pregnancies out of a hundred women for overweight, vs 1 out of a hundred for normal weight), and it's also only as reliable as you are. You need to take it around the same time every single day. If you're on other medications or using antibiotics it may lower the effectiveness of your Birth Control. By the way, I get mine at a discount at: http://www.MyCycleDirect.com after finding out that the MyCycle company is the leading online Birth Control Pharmacy on Encyclopedia.com. They also sometimes give away free samples. Good luck
A large clinical trial was conducted to confirm the effectiveness of Yaz. In this study, for every 100 women who used the drug for a year, one or two became pregnant. This is very effective, compared to many other methods of contraception. For instance, up to 14 percent of women using condoms for a year will become pregnant.

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12y ago

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