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Welcome to the comprehensive medical library of Joseph N. O’Donnell. The information shared below is provided to you as an educational and informational source only and is not intended to replace a medical examination or consultation, or medical advice given to you by a physician or medical professional.

If you have any questions or concerns regarding any condition or treatment, please contact Joseph N. O’Donnell. To schedule an appointment please call (847)298-6446 or use our online Request an Appointment form.

How Birth Control WorksC³mo funciona el control de la natalidad

How Birth Control Works

Birth control prevents pregnancy by preventing conception. Some methods prevent an egg from maturing. Some keep the sperm and egg from meeting. And some methods work in both ways.

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Preventing Ovulation

Certain hormones help prevent an egg from maturing and being released. Hormone methods include:

  • Birth control pills

  • Skin patches

  • Contraceptive vaginal rings

  • Injections

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Preventing Sperm and Egg from Meeting

Methods that prevent the sperm and egg from joining include:

  • Barrier methods, such as the condom, the diaphragm, and the cervical cap

  • Spermicide

  • The IUD (intrauterine device)

  • Sterilization

  • Natural family planning

  • Some types of hormone methods

Date Last Reviewed:

Date Last Modified: 2003-12-29T00:00:00-07:00

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