Progestin-Only Pills: These pills contain a type of progestin hormone called levonorgestrel, and they help prevent pregnancy in approximately 89 percent of cases.
Period changes are caused by the levonorgestrel that the Mirena releases, which does not allow the uterine lining to get as thick as normal.
It's been reported that pregnancy occured for 1 out of 1000 women with the Levonorgestrel (LNg) intrauterine device.
The Mirena levonorgestrel-releasing intrauterine system contains levonorgestrel, which is similar to 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.
Levonorgestrel is the only hormone in Plan B; estrogen is not present in this form of emergency contraception.
The emergency pill contains a hormone called progestin levonorgestrel.