Errin comes in packs of 28 tablets, containing 0.35 mg of norethindrone in each tablet. Unlike many other types of birth control pills, there are no inactive tablets in each pack (instead, every tablet contains the active hormone).
Food and Drug Administration, Center for Drug Evaluation and Research. Electronic orange book: approved drug products with therapeutic equivalence evaluations. FDA Web site. Available at: http://www.fda.gov/cder/ob/. Accessed January 7, 2008.
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