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Effects of Seasonique

Seasonique™ (levonorgestrel/ethinyl estradiol) is a prescription medication taken by women to prevent pregnancy. It is a combined oral contraceptive, a birth control pill that contains both an estrogen (ethinyl estradiol) and a progestin (levonorgestrel).
A large clinical trial was conducted to explore the effects of Seasonique. In this study, only 1 or 2 women out of every 100 who used this form of birth control for a year 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.
Seasonique has several different effects. It works to prevent pregnancy primarily by stopping ovulation (the maturation and release of eggs from the ovaries). It also alters the cervical mucus (the fluid of the cervix, which is the lower, narrow part of the uterus that is connected to the vagina), making it more difficult for sperm to enter the uterus.
In addition, Seasonique alters the lining of the uterus (called the endometrium), making it less receptive to an embryo.
(Click Seasonique for more information on these effects, for suggestions on when and how to take it, and to learn about the side effects associated with this form of birth control.)
Last reviewed by: Kristi Monson, PharmD
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