Hypertension Management in Breastfeeding Patients: Balancing Maternal Blood Pressure Control and Infant Safety

Hypertension is a leading cause of death and disability in the United States, affecting nearly half of all Americans, according to the NIH. Postpartum hypertension is a clinically important form of hypertension that can be preexisting or arise during or after pregnancy. While there are many medications available to manage it, many of them have side effects that can affect the patient, lactation, the nursing infant, or a combination of these factors. This review summarizes the available lactation safety data for commonly used antihypertensive medications, including breast milk concentrations, relative infant dose, infant serum levels, and reported maternal and infant outcomes. Based on the available evidence, medications are categorized according to their compatibility with breastfeeding, and a practical clinical framework is proposed to guide medication selection. Overall, calcium channel blockers, selected beta-blockers, and angiotensin-converting enzyme inhibitors demonstrated favorable safety profiles in lactating patients, whereas diuretics, clonidine, and angiotensin receptor blockers should be used with greater caution because of higher infant exposure, potential effects on lactation, reported adverse effects, or limited evidence. These data were mainly sourced from published pharmacokinetic and clinical studies, as summarized in LactMed, the NIH's Drugs and Lactation Database, which compiles lactation safety data for various medications.