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The diaphragm is a reusable flexible rubber cup that is filled with spermicide and self-inserted over the cervix prior to intercourse to prevent pregnancy. The device is left in place several hours after intercourse. The diaphragm is a prescription device fitted by a health care professional. Unlike condoms, the diaphragm does not protect against sexually transmitted diseases.
Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital.