How effective are the vaginal sponge and the diaphragm (used with a spermicidal cream) as contraceptives?
The potential adverse effect of the spermicide nonoxynol-9, in high concentration in the vagina from sponge or diaphragm use remains a concern.1 Other randomised controlled trials will be needed to resolve the potential role of spermicides in preventing sexually transmitted infections or in causing adverse effects. The company manufacturing the sponge has filed for bankruptcy, so the continued availability of the sponge is uncertain at this time.
The contraceptive vaginal sponge was developed as an alternative to the contraceptive diaphragm. The sponge, made of polyurethane impregnated with nonoxynol-9 (1g), releases 125mg of the spermicide over 24 hours of use. Unlike the diaphragm, the sponge can be used for more than 1 coital act within 24 hours without the insertion of additional spermicide, and the sponge does not require fitting or a prescription from a physician.