Birth control pills sometimes fail, but setting limits on how often that could happen would put newer, low-dose contraceptives off limits to women, federal health advisers said Wednesday.
The lower-dose pills are less effective at preventing pregnancy than the first oral contraceptives approved beginning in 1960. Yet the newer drugs offer other health benefits or cause fewer side effects. That has split federal health officials on the need to define a pregnancy or failure rate that would be unacceptably high for next-generation pills.
Throughout the 1960s, the earliest birth control pills to win Food and Drug Administration approval failed just once per 100 woman-years of use. That is, for every 100 women taking the pills for a year, there was fewer than one pregnancy on average among them.
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