Abstract
Breastfeeding after kidney transplantation remains a complex and underexplored topic, primarily due to concerns regarding the safety of immunosuppressive therapies during lactation. Individuals who have received kidney transplants face a higher likelihood of delivering preterm infants and giving birth to babies with a low birth weight when compared with the general population. In this context, breastfeeding is increasingly important because of its advantages for preterm infants. Despite the well-established benefits of breastfeeding for both the mother and infant, the traditional recommendation has been to avoid nursing due to potential drug transmission through breast milk. However, emerging evidence suggests that certain immunosuppressants may be compatible with breastfeeding, challenging long-standing clinical guidelines. In this review, we examine the current literature on the pharmacokinetics, safety profiles, and clinical outcomes associated with key immunosuppressive agents, including cyclosporine, tacrolimus, everolimus, azathioprine, corticosteroids, and belatacept. Our work highlights that all published reports to date on the studied treatments indicate that the amount of the drug reaching breast milk is considered safe for the child's health. These conclusions, however, are derived from very short-term measurements and small numbers of patients. Therefore, we emphasize the need to design structured prospective studies to assess safety in the medium and long term. Our review aims to equip clinicians with the most up-to-date evidence on this topic, enabling them to make informed decisions regarding the compatibility of post-kidney transplant treatments with breastfeeding.