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How Long Does “Plan B” Stay In Your System?

“Plan B” is a brand name birth control formulation manufactured in tablets, each of which contains 0.75 mg of the active steroid levonorgestrel. Levonorgestrel is an entirely synthetic progestogen that was synthesized in the 1960s and was included in birth control products by the 1980s.  The levonorgestrel within Plan B functions by inhibiting ovulation or …

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