Effectiveness
When Lybrel is taken regularly, without missing any days, studies have shown the failure rate to be approximately 1-2% per year, which is in line with other oral contraceptives. For women who occasionally miss pills the failure rate rises to 5% per year, but the rate rises for each additional missed pill. For comparison, here are the failure rates of other types of birth control:
| IUD |
0.1-2% |
| Depo-Provera® |
0.3% |
| Norplant® System |
0.05% |
| Diaphragm with spermicides |
20% |
| Spermicides alone |
26% |
| Male condom alone |
14% |
| Female condom alone |
21% |
| Cervical cap |
20-40% |
| Periodic abstinence |
25% |
| No methods |
85% |
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