Contraceptive Sponge Side Effects
The contraceptive sponge is a barrier form of birth control that contains the spermicide nonoxynol-9. The doughnut-shaped sponge is inserted into the vagina just before intercourse and removed after at least six hours. The spermicide is effective in killing sperm to prevent pregnancy but it does not protect women against sexually transmitted diseases. As with any drug or medical device, side effects are possible from the use of the contraceptive sponge, but Epigee.org points out that the sponge has very few such effects.