3 doctors weighed in:
How long on levlen (ethinyl estradiol and levonorgestrel) before it becomes effective?
3 doctors weighed in

Dr. Dennis Higginbotham
Obstetrics & Gynecology
2 doctors agree
In brief: Depends
It would be effective immediately if started at the time of your period.
Otherwise, allow 2 weeks to be considered protected.

In brief: Depends
It would be effective immediately if started at the time of your period.
Otherwise, allow 2 weeks to be considered protected.
Dr. Dennis Higginbotham
Dr. Dennis Higginbotham
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Dr. Dennis Higginbotham
Board Certified, Obstetrics & Gynecology
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