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Spermicide for Birth Control - Topic Overview

A spermicide is a substance that kills sperm. Spermicides are available as jelly, foam, cream, suppositories, and film. The active ingredient of most spermicides is a chemical called nonoxynol-9.

Most spermicides come with an applicator. The applicator is filled with spermicide and inserted into the vagina right before intercourse.

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  • When using a jelly, foam, or cream, you can then have sex right away.
  • A spermicide film or suppository is inserted deep into the vagina using a finger and is placed close to the cervix. Film or suppositories must be inserted at least 15 minutes before having sex to allow the spermicide to spread in the vagina.

One application of spermicide is necessary for each act of sexual intercourse.

A nonprescription method

Spermicide use does not require a prescription or a visit to a health professional. Spermicide is sold in drugstores, grocery stores, and family planning clinics.

Spermicide and a condom used together provide a reasonable level of birth control without a prescription. Using spermicide alone is not recommended because it offers poor pregnancy prevention and does not protect against sexually transmitted infections (STIs). In fact, the nonoxynol-9 in most spermicides may increase the risk of getting HIV/AIDS from an infected partner.

Effectiveness in preventing pregnancy

The most effective strength spermicide contains at least 100 mg of nonoxynol-9 per dose. You are more likely to get pregnant if you use a weaker spermicide. There is no difference in effectiveness between various spermicide types, such as gel, film, or suppository.1

Typical use failure rate includes all possible users, including people who are careless and those who use a method perfectly every time. Perfect use failure rate includes only people who use a method perfectly every time.

  • Spermicide used alone has a high failure rate of 29% for typical users. This means that in 1 year, 29 out of 100 women who use spermicide as their only method of birth control get pregnant. The perfect use failure rate is still high at 18% (18 out of 100 women).2
  • Spermicide used with another barrier method (condoms, diaphragm, or cervical cap) is more effective at preventing pregnancy than spermicide alone. For example, spermicide with a diaphragm has an average failure rate of 16%. This means that in a year, 16 out of 100 women who use a diaphragm and spermicide together get pregnant. The perfect use failure rate is much lower, at 6% (6 out of 100 women).2

Vaginal douching is not considered a birth control method even if it is done with spermicides. Douching after intercourse does not prevent sperm from reaching the fallopian tubes, where fertilization takes place.

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