However, medical studies have found that in some women, common antibiotics can reduce the amount of estradiol, or the hormone in birth control pills, in the bloodstream.
Seasonale birth control contains 0.03 mg of ethinyl estradiol, a type of estrogen, per pill (except for the week's worth of placebos every three months).
The pituitary gland in turn produces hormones that stimulate the ovaries to secrete two hormones known as estradiol and progesterone.
It contains the ethinyl estradiol and levonorgestrel, two forms of the female hormones estrogen and progesterone.
Alesse birth control pills are a combination estrogen (ethinyl estradiol) and progesterone (levonorgestrel) pill.
Ethinyl estradiol, an estrogen derivative, is sometimes used for the treatment of hypogonadism.
Pills with lower levels of ethinyl estradiol are likely to lead to more breakthrough bleeding.
The ovaries may fail to produce enough estradiol to stimulate the growth of the endometrium.
If the level of estradiol gets too low, the drug won't work to prevent pregnancy.