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spermicide
Spermicide is a contraceptive substance that destroys sperm, inserted vaginally prior to intercourse to prevent pregnancy. As a contraceptive, spermicide may be used alone. However, the pregnancy rate experienced by couples using only spermicide is higher than that of couples using other methods. Usually, spermicides are combined with contraceptive barrier methods such as diaphragms, condoms, cervical caps, and sponges. Combined methods are believed to result in lower pregnancy rates than either method alone.
Spermicides are unscented, clear, unflavored, non-staining, and lubricative.
==Types and effectiveness==
The most common active ingredient of spermicides is nonoxynol-9. Spermicides containing nonoxynol-9 are available in many forms, such as jelly (gel), films, and foams. Used alone, spermicides have a perfect use failure rate of 18% per year when used correctly and consistently, and 28% failure rate per year in typical use.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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