Safety in Lactation: Insulins

Sarah Fenner, Acting Co-Director, Midlands and East Medicines Advice Service (Midlands site) & UK Drugs in Lactation Advisory ServicePublished

Exogenous insulin is excreted into breast milk, including that from insulin analogues.
Insulin in breast milk is thought to be necessary for intestinal maturation of the infant and may help decrease the risk of contracting type 1 diabetes in breastfed infants.
Insulin requirements may be less than the pre-pregnancy doses, since glucose is being used for milk production. However, good glycaemic control is essential for the lactation process.