Spermicide is inserted into the vagina before intercourse. Spermicides come in gel, foam, or small, bullet-shaped suppositories that dissolve and release spermicide. Spermicides prevent pregnancy by blocking the cervix (the entrance to the uterus) and stopping sperm from moving.
When used consistently and correctly, 15 percent of women will become pregnant over the course of one year. 29 out of 100 typical users will become pregnant over the course of one year.
Spermicides are available without a prescription at drug stores, supermarkets, or discount stores.