How effective are internal condoms at preventing pregnancy?

<p>That all depends how they&rsquo;re used. With perfect use they are around 95% effective, but the way they&rsquo;re typically used you can expect around them to be closer to 79% effective.</p> <p>In other words:</p> <p>Of those women who use the internal condom exactly as directed, about 5 in 100 will experience an accidental pregnancy during the first year they use this method.</p> <p>Of those women who do not use the internal condom exactly as directed, about 21 in 100 will experience an accidental pregnancy during the first year they use this method.</p>