Effects of oral contraceptives on lactation
Koetsawang, S.; Bhiraleus, P.; Chiemprajert, T.
Fertility and Sterility 23(1): 24-28
1972
ISSN/ISBN: 0015-0282 PMID: 4109500 DOI: 10.1016/s0015-0282(16)38704-0Document Number: 480656
General observation on 205 lactating mothers taking an oral contraceptive showed that after completing 6 cycles 28.3% had a marked decrease and 44.4% a slight decrease in milk supply. A more detailed controlled study was initiated. The mothers were from 20 to 39 years old. They were controls given no hormonal preparation, given 1 mg ethynodioldiacetate with 0.1 mg mestranol (ovulen) or given 0.08 mg mestranol and 2.0 mg chlormadinone (C-Quens) for 16 weeks. Lactation began to decrease 2 weeks later in those given ovulen and 4 weeks later in those given C-Quens: infant weight gain in those groups was lower than in the controls. Sp. gr. and composition of the milk was unchanged. It was suggested that the suppression of lactation was caused by the oestrogen content of the contraceptives.
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