efficacy - with a failure rate of 1 in 1000, injectable hormonal contraception is more effective than use of the combined pill and female sterilisation (1 in 200 failure) (1)
when administered at the recommended dosing interval the failure rate of progestogen-only injectable contraception is approximately 0.2% in the first year of use. With typical use the failure rate is approximately 6% (2)
ease and convenience of use
use can be kept secret
reduced menstrual loss
independent of GIT function
independent of small intestine
not affected by antibiotics
avoids pass through the liver
fewer metabolic effects
can be used when oestrogens contraindicated
stimulates erythropoiesis - reduces crises in homozygous sickle cell disease
probable reduction in menstrual disorders and gynaecological disease as for combined oral contraceptive - exception of irregular bleeding - but amenorrhoea generally supervenes with regular use
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