This case report describes a patient who ingested magnesium sulfate (MgSO4) for approximately four days as a treatment for pregnancy-induced hypertension. Stage II lactogenesis was delayed until the tenth postpartum day at which point the patient's breasts be-came fully engorged. No explanation for this delay was found, other than the possibility that magnesium sulfate treatment impeded lactogenesis. Implications for professionals who care for lactating women are discussed.
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