Never use it alone. Spermicides are chemical products or substances that immobilize or kill sperm to prevent pregnancy. Basically, the spermicide is inserted into the vagina to stop sperm from making it to the uterus and fertilizing an egg. It can also protect against some STDs , such as gonorrhea and chlamydia . Nonoxynol-9 is the most common spermicide.
Various options come in foam, film, jelly, cream and suppositories.
Also, never use a spermicide alone. They are highly effective when used with a condom, cervical cap or diaphragm, but alone provide very little protection against STDs and pregnancy. You have to thoroughly wash your hands before inserting the film, which you some feel ruins the mood It has to dissolve for 10 to 15 minutes before it's effective. When used perfectly with a condom the failure rate, or chance of pregnancy, is only 1 percent. Various spermicides are found in most drug and convenient stores.