What it is
Spermicide is a chemical that immobilizes or kills sperm on contact. It comes as gels, foams, films, suppositories, and tablets that you insert into the vagina before sex. A common active ingredient is nonoxynol-9.
How well it works
Spermicide alone is less effective than many other contraceptive methods. With typical use, about 21% of users get pregnant in the first year, so it works better with a barrier method like a diaphragm, cervical cap, or condom. Timing depends on the product: some spermicides must go in at least 10 to 15 minutes before sex, and many work for only 1 hour after you put them in. Use a new dose for each act. You can buy it over the counter at pharmacies or online.
Side effects and cautions
Frequent use of nonoxynol-9 can irritate vaginal tissue, which may increase the risk of HIV transmission if you are exposed. For this reason, spermicide is not recommended for people at high risk of HIV.
Where to get it
You can buy spermicide over the counter at pharmacies, grocery stores, and online without a prescription. Some family planning clinics and Planned Parenthood health centers also have it.
