It protects for 48 hours and for multiple acts of intercourse within this time. Also, with prolonged use of two or more days, the cap may cause an unpleasant vaginal odor or discharge in some women. Inserted into the vagina to cover the cervix, the sponge is attached to a woven polyester loop for easier removal. The sponge protects for up to 24 hours and for multiple acts of intercourse within this time. Vaginal Spermicides Alone Vaginal spermicides are available in foam, cream, jelly, film, suppository, or tablet forms.
All types contain a sperm-killing chemical.
Studies have not produced definitive data on how well spermicides alone prevent pregnancy, but according to the authors of Contraceptive Technology, a leading resource for contraceptive information, the failure rate for typical users may be 26 percent per year. Package instructions must be carefully followed because some spermicide products require the couple to wait 10 minutes or more after inserting the spermicide before having sex. One dose of spermicide is usually effective for one hour. For repeated intercourse, additional spermicide must be applied. And after intercourse, the spermicide has to remain in place for at least six to eight hours to ensure that all sperm are killed.