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A progesterone-like substance, usually more active when given by mouth than natural progesterone is. Used with an estrogen in the birth control (oral contraceptive) pill. Commonly used examples have a structure like progesterone itself (e.g. medroxyprogesterone acetate, or Provera; cyproterone acetate, or Androcur) or have a structure distantly related to the male hormone testosterone (e.g. norethindrone, or Aygestin; norethisterone, or Primolut N; norgestrel)
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