Which Spermicide Is Most Effective?

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.

How can you make spermicide more effective?

For maximum effectiveness, make sure the spermicide remains in your vagina for at least six hours after sex. After six hours, there's no need to clean any remaining spermicide from your vagina. Douching isn't recommended — but if you choose to douche after sex, wait at least six hours.

How long is spermicide effective?

Many forms of spermicides are effective for only 1 hour after they are inserted. More spermicide should be used if more than 1 hour passes before sex, or if a couple is going to have sex again. A girl shouldn't douche for at least 6 hours after a couple has sex using spermicide as birth control.