Information on Amethyst's Effects and How It Works
How Does Amethyst Work?Amethyst is a combined oral contraceptive, which means that it contains both an estrogen (ethinyl estradiol) and a progestin (levonorgestrel). It primarily works to prevent pregnancy by stopping ovulation (the maturation and release of eggs from the ovaries).
However, it also prevents pregnancy in two other, minor ways. Amethyst 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. The drug also alters the lining of the uterus (the endometrium), making it less receptive to an embryo.
There is no reason for women to have a monthly period while taking birth control pills. In fact, the "period" you experience while taking birth control pills isn't really a period at all. Because ovulation does not occur, the body does not prepare for a possible pregnancy by building up the lining of the uterus, so there is no need to shed the lining, as with a regular period. Instead, the "period" that occurs due to birth control pills is actually caused by a withdrawal of the hormones in the pills, which causes bleeding.
Even though you will not have a regular monthly period while taking Amethyst, you will probably have some bleeding from time to time. This bleeding may resemble a menstrual period, but it will not occur at regular intervals.
Clinical EffectsAmethyst is a generic version of Lybrel™. Lybrel was shown to be an effective birth control method in a large clinical trial. In this study, between 1 and 3 out of every 100 women who used it 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.
Studies have also shown that more than half of women taking Lybrel for one year will not have any bleeding or spotting, but it often takes several months for this to occur. Some women will continue to have bleeding and spotting.