Oral contraceptives, also known as birth control pills, are designed to prevent pregnancy by stopping ovulation. They can be taken continuously for 84 days on and 7 days off to have 4 periods per year, and can also be used to regulate menstrual cycles and decrease painful periods or treat acne. Benefits include allowing women to space out pregnancies and prevent unwanted pregnancies that carry medical, social, and financial risks. Potential side effects include depression, anxiety, increased blood pressure, blood clots, and bleeding, so women should see a doctor if any side effects occur. It is important to take the pill at the same time each day to prevent pregnancy from missed doses.