Last update: June 4, 2016

Diltiazem Hydrochloride

Very Low Risk for breastfeeding

Safe. Compatible.
Minimal risk for breastfeeding and infant.

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.


Suggestions made at e-lactancia are done by APILAM´s pediatricians and pharmacists, and are based on updated scientific publications.
It is not intended to replace the relationship you have with your doctor but to compound it.

Jose Maria Paricio, Founder & President of APILAM/e-Lactancia

Your contribution is essential for this service to continue to exist. We need the generosity of people like you who believe in the benefits of breastfeeding.

Thank you for helping to protect and promote breastfeeding.

José María Paricio, founder of e-lactancia.

Other names

Diltiazem Hydrochloride in other languages or writings:


Diltiazem Hydrochloride belongs to this group or family:


Main tradenames from several countries containing Diltiazem Hydrochloride in its composition:


Variable Value Unit
Oral Bioavail. 42 ± 18 %
Molecular weight 451 daltons
Protein Binding 80 %
VD 5,3 ± 1,7 l/Kg
Tmax 3 - 8 hours
T1/2 3,2 ± 1,3 hours
M/P ratio 1 -
Theoretical Dose 0.03 mg/Kg/d
Relative Dose 0,9 - ,5 %
Relat.Ped.Dose 1,5 %


  1. Serrano Aguayo P, García de Quirós Muñoz JM, Bretón Lesmes I, Cózar León MV. Tratamiento de enfermedades endocrinológicas durante la lactancia. [Endocrinologic diseases management during breastfeeding.] Med Clin (Barc). 2015 Abstract
  2. Rowe H, Baker T, Hale TW. Maternal medication, drug use, and breastfeeding. Pediatr Clin North Am. 2013 Feb;60(1):275-94. Abstract
  3. Velardo A, Ricci S, Zironi C, Pantaleoni M, Zizzo G, Badiali A, Marrama P. Effects of prolonged treatment with diltiazem on pituitary secretion of luteinizing hormone, follicle-stimulating hormone, thyrotropin and prolactin. Horm Res. 1992 Abstract
  4. Lubbe WF. Use of diltiazem during pregnancy. N Z Med J. 1987 Abstract
  5. Okada M, Inoue H, Nakamura Y, Kishimoto M, Suzuki T. Excretion of diltiazem in human milk. N Engl J Med. 1985 Abstract
  6. Hermann P, Rodger SD, Remones G, Thenot JP, London DR, Morselli PL. Pharmacokinetics of diltiazem after intravenous and oral administration. Eur J Clin Pharmacol. 1983 Abstract

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