Norethisterone (or norethindrone) (or 19-nor-17α-ethynyltestosterone) is a molecule used in some combined oral contraceptive pills progestogen only pills and is also available as a stand-alone drug. It is a progestogen and can be used to treat premenstrual syndrome painful periods abnormal heavy bleeding irregular periods menopausal syndrome (in combination with oestrogen) or to postpone a period.
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