It is excreted in breast milk in a clinically non-significant amount (Okada 85)Two 6 months-old breastfed twins whose mother was treated with diltiazem did not get into health problems (Lubbe 87) Evidence on other antihypertensive drugs of the same family with similar structure, pharmacokinetics and action profile (nifedipine, nimodipine, nicardipine) has shown that they are excreted into milk in non-significant amount.Diltiazem does not have any influence on prolactin production. Until more extensive published data about this drug regarding breastfeeding are available a safer alternative drug should be used, especially during the neonatal period and/or in case of premature infants. American Academy of Pediatrics: medication usually compatible with breastfeeding.