Last update April 16, 2024


Very Low Risk

Safe. Compatible. Minimal risk for breastfeeding and infant.

It is a steroid with a structure similar to that of the natural adrenocortical hormone aldosterone, being an antagonist of aldosterone receptors. It acts as a potassium-sparing diuretic, increasing the excretion of sodium and water. It is used for the treatment of hypertension, primary hyperaldosteronism, edema due to heart failure, liver cirrhosis, nephrotic syndrome, or associated with malignancy, and hypokalemia. It has antiandrogenic properties and is used to treat hirsutism, particularly polycystic ovarian syndrome. It is a prodrug that is metabolized to canrenone. Oral administration once a day

Excretion into breast milk is clinically non-significant (Phelps 1977) and without side-effects observed in breastfed infants of treated mothers. (de Jong 2022, Reisman 2018, Gutgesell 1990, Phelps 1977)

Spironolactone did not alter milk composition in a transgender woman. (Delgado 2023)

It decreases slightly the secretion of Prolactin, however, instead other diuretic drugs, a suppressive effect on lactation has not been reported.

It can cause gynecomastia. (Trinchieri 2021, Deepinder 2012, Cuculi 2007)

It is a medication for pediatric use, including the neonatal period.

Several medical societies and expert authors consider the use of this medication during breastfeeding possible. (Hale, LactMed, Kearney 2018, Anderson 2018, Malachias 2016, Briggs 2015, Ghanem 2008)

American Academy of Pediatrics: medication usually compatible with breastfeeding.(AAP 2001). Recommendations for Drugs in the Eleventh WHO Model List of Essential Drugs: compatible with Breastfeeding. (WHO 2002)


We do not have alternatives for Spironolactone since it is relatively safe.

Suggestions made at e-lactancia are done by APILAM team of health professionals, and are based on updated scientific publications. It is not intended to replace the relationship you have with your doctor but to compound it. The pharmaceutical industry contraindicates breastfeeding, mistakenly and without scientific reasons, in most of the drug data sheets.

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

Spironolactone in other languages or writings:


Spironolactone belongs to this group or family:


Main tradenames from several countries containing Spironolactone in its composition:


Variable Value Unit
Oral Bioavail. 90 %
Molecular weight 417 daltons
Protein Binding 90 %
pKa 17.89 -
Tmax 1 - 2.6 hours
13 - 24 hours
M/P ratio 0.5 - 0.7 -
Theoretical Dose 0.016 mg/Kg/d
Relative Dose 1.9 %
Ped.Relat.Dose 0.5 - 1.6 %


  1. LactMed. Drugs and Lactation Database (LactMed). Internet. Bethesda (MD): National Library of Medicine (US); 2006-. Available from: 2006 - Consulted on April 16, 2024 Full text (link to original source)
  2. Hale TW. Medications & Mothers' Milk. 1991- . Springer Publishing Company. Available from Consulted on April 10, 2024 Full text (link to original source)
  3. Delgado D, Stellwagen L, McCune S, Sejane K, Bode L. Experience of Induced Lactation in a Transgender Woman: Analysis of Human Milk and a Suggested Protocol. Breastfeed Med. 2023 Nov;18(11):888-893. Abstract
  4. de Jong MFC, Riphagen IJ, Kootstra-Ros JE, Groenewout M. Potassium and Magnesium in Breast Milk of a Woman With Gitelman Syndrome. Kidney Int Rep. 2022 May 10;7(7):1720-1721. Abstract Full text (link to original source)
  5. Trinchieri A, Perletti G, Magri V, Stamatiou K, Trinchieri M, Montanari E. Drug-induced gynecomastia: A systematic review and meta-analysis of randomized clinical trials. Arch Ital Urol Androl. 2021 Dec 21;93(4):489-496. Abstract
  6. Anderson PO. Treating Hypertension During Breastfeeding. Breastfeed Med. 2018 Abstract
  7. Kearney L, Wright P, Fhadil S, Thomas M. Postpartum Cardiomyopathy and Considerations for Breastfeeding. Card Fail Rev. 2018 Abstract Full text (link to original source) Full text (in our servers)
  8. Reisman T, Goldstein Z. Case Report: Induced Lactation in a Transgender Woman. Transgend Health. 2018 Jan 1;3(1):24-26. Abstract Full text (link to original source) Full text (in our servers)
  9. Malachias MV, Figueiredo CE, Sass N, Antonello IC, Torloni MR, Bortolotto MRF L. 7th Brazilian Guideline of Arterial Hypertension: Chapter 9 - Arterial Hypertension in pregnancy Arq Bras Cardiol. 2016 Abstract Full text (link to original source)
  10. Briggs GG, Freeman RK, Towers CV, Forinash AB. Drugs in Pregnancy and Lactation: A Reference Guide to Fetal and Neonatal Risk. Wolters Kluwer Health. Tenth edition (acces on line) 2015
  11. Butler DC, Heller MM, Murase JE. Safety of dermatologic medications in pregnancy and lactation: Part II. Lactation. J Am Acad Dermatol. 2014 Mar;70(3):417.e1-10; quiz 427. Abstract
  12. Deepinder F, Braunstein GD. Drug-induced gynecomastia: an evidence-based review. Expert Opin Drug Saf. 2012 Sep;11(5):779-95. Abstract
  13. Nakhjavani M, Hamidi S, Esteghamati A, Abbasi M, Nosratian-Jahromi S, Pasalar P. Short term effects of spironolactone on blood lipid profile: a 3-month study on a cohort of young women with hirsutism. Br J Clin Pharmacol. 2009 Abstract
  14. Ghanem FA, Movahed A. Use of antihypertensive drugs during pregnancy and lactation. Cardiovasc Ther. 2008 Abstract Full text (link to original source) Full text (in our servers)
  15. Cuculi F, Suter A, Erne P. Spironolactone-induced gynecomastia. CMAJ. 2007 Feb 27;176(5):620. No abstract available. Abstract Full text (link to original source)
  16. WHO / UNICEF. BREASTFEEDING AND MATERNAL MEDICATION Recommendations for Drugs in the Eleventh WHO Model List of Essential Drugs. Department of Child and Adolescent Health and Development (WHO/UNICEF) 2002 Abstract Full text (link to original source) Full text (in our servers)
  17. AAP - American Academy of Pediatrics Committee on Drugs. Transfer of drugs and other chemicals into human milk. Pediatrics. 2001 Sep;108(3):776-89. Abstract Full text (link to original source) Full text (in our servers)
  18. Erenus M, Gürbüz O, Durmuşoğlu F, Demirçay Z, Pekin S. Comparison of the efficacy of spironolactone versus flutamide in the treatment of hirsutism. Fertil Steril. 1994 Abstract
  19. Cusan L, Dupont A, Gomez JL, Tremblay RR, Labrie F. Comparison of flutamide and spironolactone in the treatment of hirsutism: a randomized controlled trial. Fertil Steril. 1994 Abstract
  20. Vĕtr M, Sobek A. Low dose spironolactone in the treatment of female hyperandrogenemia and hirsutism. Acta Univ Palacki Olomuc Fac Med. 1993 Abstract
  21. Gutgesell M, Overholt E, Boyle R. Oral bretylium tosylate use during pregnancy and subsequent breastfeeding: a case report. Am J Perinatol. 1990 Apr;7(2):144-5. Abstract
  22. Phelps DL, Karim A. Spironolactone: relationship between concentrations of dethioacetylated metabolite in human serum and milk. J Pharm Sci. 1977 Abstract

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