Yaz Vs. Plan B

Some people get confused when comparing Plan B versus Yaz. There are some general similarities and differences between the two birth control medications. Yaz® (drospirenone/ethinyl estradiol) is an oral contraceptive that is taken on a daily basis to prevent pregnancy. Plan B® (levonorgestrel) is a medication that is an emergency contraceptive, which is used to prevent pregnancy after unprotected sex.
Although the two drugs contain different hormones, they both work to prevent pregnancy in similar ways. The products primarily work by stopping ovulation, which is the maturation and release of eggs from the ovaries. However, they also alter the lining of the uterus (making it less receptive to an embryo).
Effectiveness of Yaz
Yaz was shown to be an effective birth control method in a large clinical trial. In this study, for every 100 women who used the drug for a year, only one or two became pregnant.
Effectiveness of Plan B
Taking it within 72 hours after unprotected sex reduces the risk of pregnancy by 89 percent. After any one act of unprotected intercourse, the average woman has an 8 percent chance of getting pregnant. If she takes Plan B, that risk is reduced to about 1 percent.
(Click Yaz and Plan B for more information on these drugs, for details on how to take each of these methods of birth control, and to learn about the potential side effects of these products.)
Last reviewed by: Kristi Monson, PharmD
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