A 47-year-old member asked:
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is there anything that could change the effectiveness of birth control pills?

1 doctor answer
Dr. Paula Hillard
43 years experience Obstetrics and Gynecology
Missed pills: With no missed pills, "perfect use", the failure rate of birth control pills is 0.3%, that is >99% effective.In typical use, because taking a pill every day without ever missing is hard, about 9/100 couples will get pregnant/year. Not missing pills is the best way for the pills to work for you.
Answered on Feb 2, 2015

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