Oral contraceptives, “the pill,” are 95 to 99.9% effective at preventing pregnancy. The pill contains the hormones estrogen and progestin and is available in different hormone dosages. A pill is taken daily by mouth to block the release of eggs from the ovaries. Oral contraceptives lighten the flow of your period and can reduce the risk of pelvic inflammatory disease (PID), ovarian cancer, benign ovarian cysts, endometrial cancer, and iron deficiency anemia. It does not protect against STDs or HIV. The pill may add to your risk of heart disease, including high blood pressure, blood clots, and blockage of the arteries, especially if you smoke. If you are over age 35 and smoke, or have a history of blood clots or breast, liver, or endometrial cancer, your doctor may advise you not to take the pill. Some antibiotics may reduce the effectiveness of the pill in some women. Talk to your doctor or nurse about a back-up method of birth control if she or he prescribes antibiotics.

Mini-pills are 92 to 99.9% effective at preventing pregnancy if used correctly. The mini-pill needs to be taken at the same time each day. A back-up method of birth control is needed if you take the pill more than three hours late. Unlike the pill, the mini-pill only has one hormone progestin instead of both estrogen and progestin. Taken daily, the mini-pill thickens cervical mucus to prevent sperm from reaching the egg. It also prevents a fertilized egg from implanting in the uterus (womb). The mini-pill also can decrease the flow of your period and protect against PID and ovarian and endometrial cancer. Mothers who breastfeed can use it because it will not affect their milk supply. The mini-pill is a good option for women who can’t take estrogen, are over 35, or have a risk of blood clots. The mini-pill does not protect against STDs or HIV. Some antibiotics may reduce the effectiveness of the pill in some women. Talk to your doctor or nurse about a back-up method of birth control if she or he prescribes antibiotics. You will need to visit you doctor for a prescription and to make sure you are not having problems.

The patch is 98 to 99% effective at preventing pregnancy, but appears to be less effective in women who weigh more than 198 pounds. This is a skin patch worn on the lower abdomen, buttocks, or upper body. It releases the hormones progestin and estrogen into the bloodstream. You put on a new patch once a week for three weeks, and then do not wear a patch during the fourth week in order to have a menstrual period. It does not protect against STDs or HIV. You will need to visit your doctor for a prescription and to make sure you are not having problems.