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About Birth Control Pills Oral contraceptives or birth control pills are used to prevent pregnancy.You need a doctor's prescription to get birth control pills. There are two types of birth control pills: "combined oral contraceptives" and "minipills." Combined oral contraceptives have a combination of two hormones--estrogen and progestin. They work by keeping the ovaries from releasing an egg. Birth control pills must be taken every day. Minipills contain only one hormone, progestin. They work by thickening the cervical mucus to keep sperm from reaching the egg. Sometimes they also keep the ovaries from releasing an egg. You must take one pill every day. Minipills are slightly less effective than combined oral contraceptives. Health Related Websites
The National Heart, Lung, and Blood Institute
National Institute of Allergy and Infectious Diseases
National Institute of Arthritis and Musculoskeletal and Skin Diseases
National Institute of Diabetes and Digestive and Kidney Diseases
National Institute on Drug Abuse
National Institute of Mental Health
National Institute of Neurological Disorders and Stroke
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