Portia comes in packs of 28 tablets, containing 0.15 mg of levonorgestrel and 0.03 mg of ethinyl estradiol in each of the first 21 tablets. The last seven tablets of each pack contain no active ingredients.
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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 December 28, 2007.