Contraception

Contraceptive agents work in many ways to prevent a pregnancy. They are usually divided into those that are either hormonal or nonhormonal. Most of the hormonal contraceptives work by changing a woman's hormone levels to mimic a pregnancy, therefore preventing eggs from being able to be released from the ovary. In contrast, nonhormonal contraceptive agents or devices work by preventing a man's sperm from joining a woman's egg.