1 doctor weighed in:

How effective are birth control pills?

1 doctor weighed in
Dr. Holly Maes
Pediatrics

In brief: 95-99%

Depending on the pill type, most oral contraceptives are effective in the high 90's percentages.
However, it also depends on compliance by the user - miss doses and efficacy quickly drops. While 99% sounds pretty good, that still means about 1 pregnancy in 100 women per year, and if you are that 1 pregnancy, you may not be very happy. The only 100% effective form of birth control is abstinence.

In brief: 95-99%

Depending on the pill type, most oral contraceptives are effective in the high 90's percentages.
However, it also depends on compliance by the user - miss doses and efficacy quickly drops. While 99% sounds pretty good, that still means about 1 pregnancy in 100 women per year, and if you are that 1 pregnancy, you may not be very happy. The only 100% effective form of birth control is abstinence.
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