I have heard 2 weeks. I have also heard it can take up to one month ...
According to the product label at http://www.accessdata.fda.gov/drugsatfda_docs/anda/2001/75-796_Aviane-21%20and%20Aviane-28_prntlbl.pdf, it says seven days. A nonhormonal back-up method of birth control should be used during those seven days.
You can double check on the package insert that came with the pills.
- Aviane Information for Consumers
- Aviane Information for Healthcare Professionals (includes dosage details)
- Side Effects of Aviane (detailed)
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