Last update Feb. 7, 2016
Suggestions made at e-lactancia are done by APILAM team of health professionals, and are based on updated scientific publications. It is not intended to replace the relationship you have with your doctor but to compound it. The pharmaceutical industry contraindicates breastfeeding, mistakenly and without scientific reasons, in most of the drug data sheets.
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Thank you for helping to protect and promote breastfeeding.
Mestranol + Norethynodrel in other languages or writings:
Mestranol + Norethynodrel belongs to this group or family:
Main tradenames from several countries containing Mestranol + Norethynodrel in its composition:
|Oral Bioavail.||- / 70||%|
|Molecular weight||310 / 298||daltons|
|Protein Binding||- / 97||%|
|VD||- / 4||l/Kg|
|Tmax||- / 2||hours|
|T½||- / 8||hours|
|M/P ratio||- / 0.3||-|
|Theoretical Dose||- / 0.0001||mg/Kg/d|
|Relative Dose||- / 0.1 - 1||%|
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e-lactancia is a resource recommended by Asociación Española de Bancos de Leche Humana of Spain
Would you like to recommend the use of e-lactancia? Write to us at corporate mail of APILAM
Birth control pill that contains the combination of an estrogen (Mestranol) and a progestin (Norethynodrel) for oral use. It was the first marketed contraceptive (1959).
Currently withdrawn from market.
Mestranol is a synthetic estrogen that is metabolized to Ethinylestradiol with similar actions as estradiol. A latest update no published data on excretion in breast milk, found were found. However, it is known that its metabolite Ethinylestradiol is excreted into milk in no or small amount.
There is evidence (albeit inconsistent) that estrogen-containing pills may decrease milk production, especially during the first few weeks postpartum with a daily dose above 30 micrograms of ethinyl estradiol.
It may reduce the protein content of the milk.
No problems have been observed in infants whose mothers were treated, except one isolated case of transient gynecomastia.
Norethynodrel is a progestin drug similar to Norethinondrone. It is excreted into breast milk in clinically non-significant amount and no problems have been observed in infants whose mothers were treated with it. Its plasma levels in these infants were undetectable or very low.
Currently, studies have not found differences on the frequency of breastfeeding or the amount of milk produced or weight gain of breastfed infants compared to other contraceptive methods (intrauterine devices, isolated progestogens). However, it would be advisable to avoid them until breastfeeding is well established (4-6 weeks).
During lactation, progestin-only contraceptive pills are preferred to Estrogen containing ones, otherwise, the lowest estrogen dose should be used.
Within the first 6 postpartum weeks, non-hormonal methods are in the first line of choice.
Hormone containing contraceptives do not affect the composition of milk, minerals (Mg, Fe, Cu, Ca, P) fat, lactose and calories but only a few the proteins.