Certain birth control methods contain man-made forms of hormones. These hormones are normally made in a woman's ovaries. These hormones are called estrogen and progestin.
Both of these hormones prevent a woman's ovaries from releasing an egg. The release of an egg during menstrual cycle is called ovulation. They do this by changing the levels of the natural hormones the body makes.
Progestin also helps prevent sperm from entering the uterus by making the mucous around a woman's cervix thick and sticky.
Birth control pills are one way of receiving these hormones. They are only effective if taken daily, preferably at about the same time.
There are other methods to prevent pregnancy. The same hormones may be used but they are released slowly over time.
A progestin implant is a small rod that is implanted under the skin, most often on the inside of the arm. The rod releases a small amount of the progestin daily into the bloodstream.
It takes about a minute to insert the rod. The procedure is done using a local anesthetic in a doctor's office. The rod can stay in place for 3 years. However, it can be removed at any time. Removal usually takes only a few minutes.
After the implant has been inserted:
Progestin implants work better than birth control pills to prevent pregnancy. Very few women who use these implants are likely to get pregnant.
Your regular menstrual cycles should return within 3 to 4 weeks after these implants are removed.
Injections or shots that contain the hormone progestin also work to prevent pregnancy. A single shot works for up to 90 days. These injections are given into the muscles of the upper arm or buttocks.
Side effects that may occur include:
Progestin injections work better than birth control pills to prevent pregnancy. Very few women who use progestin injections is likely to get pregnant.
Sometimes the effects of these hormone shots last longer than 90 days. If you are planning to become pregnant in the near future, you might want to consider a different birth control method.
The skin patch is placed on your shoulder, buttocks, or another area of your body. A new patch is applied once a week for 3 weeks. Then you go 1 week without a patch.
Estrogen levels are higher with the patch than with birth control pills or the vaginal ring. Because of this, there may be an increased risk for blood clots in the legs or lungs with this method. The FDA has issued a warning about the patch and the higher risk for a blood clot traveling to a lung.
The patch slowly releases both estrogen and progestin into your blood. Your health care provider will prescribe this method for you.
The patch works better than birth control pills to prevent pregnancy. Very few women who use the patch are likely to get pregnant.
The skin patch contains estrogen. Along with the higher risk for blood clots, there is a rare risk for high blood pressure, heart attack, and stroke. Smoking increases these risks even more.
The vaginal ring is a flexible. This ring is about 2 inches (5 cm) wide and is placed into the vagina. It releases the hormones progestin and estrogen.
Side effects with the ring may include:
The vaginal ring contains estrogen. As a result, there is a rare risk for high blood pressure, blood clots, heart attack, and stroke. Smoking increases these risks even more.
The vaginal ring slowly releases both estrogen and progestin into your blood.
The vaginal ring works better than birth control pills to prevent pregnancy. Very few women who use the vaginal ring is likely to get pregnant.
An intrauterine device (IUD) is a small plastic T-shaped device used for birth control. It is inserted into the uterus. IUDs prevent sperm from fertilizing an egg.
A newer type of IUD called Mirena releases a low dose of a hormone into the uterus each day for a period of 3 to 5 years. This increases the effectiveness of the device as a birth control method. It also has the added benefits of reducing or stopping menstrual flow. It may help protect against cancer (endometrial cancer) in women who are at risk of developing the disease.
You have choices for what type of IUD to have. Talk with your provider about which type may be best for you.
Reviewed By: John D. Jacobson, MD, Professor of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda Center for Fertility, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.