Norethisterone

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Progestagen. Used in (POP) for contraception, to delay or suppress menstruation, of for other purposes - see Progesterone.

Although a progestagen, 1mg of norethisterone is metabolised to about 4-6mcg of ethinylestradiol. The standard dose of 5mg tds will therefore be equivalent to the oestrogen content of some oestrogen-containing pills. Some of the contra-indications to COCP may therefore apply.

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