
Intrauterine devices (IUDs) seem to be an effective method of emergency contraception, with a failure rate of less than one per thousand, according to a meta-analysis.
In a review of 35 years of data in which IUDs were inserted after unprotected intercourse, 99.86% of overall women did not become pregnant, reported Kelly Cleland, a research scientist at Princeton University in New Jersey, and colleagues in Human Reproduction.

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