A 26-year-old female asked:
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How long after taking the birth control pill does it become effective. I am taking the brand alesse if that matters.

1 doctor answer
Dr. Kenneth Crabb
45 years experience in Obstetrics and Gynecology
Generally immediate: If the pill is started in the first 5-7 days from the onset of a menstrual period, it usually stops the next ovulation. To be on the safe side, use a backup method for 2 weeks. Remember, the pill does not prevent any diseases, so using condoms is generally recommended until marriage which will also serve as a back up method.
Answered on Feb 17, 2013
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