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In page Estradiol enantate:

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There were concerns about possible accumulation of estradiol enantate and consequent estrogenic overexposure with once-monthly combined injectable contraceptives containing the medication due its long duration, and this may have limited the use of such combined injectable contraceptives.[13][1] Subsequent clinical studies have found that there is very limited or no accumulation of estradiol enantate when it is used in once-a-month injectable contraceptives.[13][16][17]