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Injectable hormonal contraceptives are slow release, long lasting progesterone preparations administered i.m. at intervals from 1 to 6 months. Common preparations include medroxyprogesterone acetate and norethisterone enanthate.
The main disadvantages are due to the progesterone. Many experience some degree of menstrual disturbance; in some, this can be irregular uterine bleeding which may be heavy and prolonged whilst others may experience amenorrhoea.
Injectable contraception however, may be particularly suited:
Injectable hormonal contraception has a failure rate of 1 in 1000. Thus this form of contraception is more effective than the combined pill and female sterilisation (1 in 200 failure rate) (1).