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Hydrochlorothiazide use while Breastfeeding

Drugs containing Hydrochlorothiazide: Hyzaar, Dyazide, Maxzide, Avalide, HydroDIURIL, Ziac, Zestoretic, Microzide, Diovan HCT, Benicar HCT, Show all 76 »Tribenzor, Aldactazide, Prinzide, Vaseretic, Micardis HCT, Exforge HCT, Accuretic, Lotensin HCT, Lopressor HCT, Esidrix, Capozide 50/25, Atacand HCT, HydrALAZINE Plus, Dutoprol, Oretic, Monopril HCT, Moduretic, Capozide, Hydra-Zide, Amturnide, Maxzide-25, Inderide LA, Inderide, Diuretic Ap-Es, Aquazide H, Moduretic 5-50, Hydroserpine, Quinaretic, Uniretic, Aldoril, Serpazide, Apresazide, Diaqua, Tekturna HCT, Hydro Par, Hydroserp, Hydropres-25, Hydroserpine 1, Hydropres-50, Hydro-Reserp, Hydrap-ES, Capozide 25/15, Unipres, Timolide, Timolide 10-25, Marpres, Tri-Hydroserpine, Uni Serp, Serathide, HHR, Capozide 25/25, Serpex, Ezide, Capozide 50/15, Oreticyl 25, Oreticyl 50, Aldoril D50, Aldoril D30, Aldoril 25, Ser-Ap-Es, Oreticyl Forte, Teveten HCT, Esimil, Loqua, Carozide, Aldoril 15

Medically reviewed by Last updated on Apr 22, 2019.

Hydrochlorothiazide Levels and Effects while Breastfeeding

Summary of Use during Lactation

Hydrochlorothiazide doses of 50 mg daily or less are acceptable during lactation. Intense diuresis with large doses may decrease breastmilk production.

Drug Levels

Maternal Levels. In a mother who was 28 days postpartum, hydrochlorothiazide reached a peak milk level of about 275 mcg/L at about 3 hours after a 50 mg oral dose. The infant received a daily dosage of about 2% of the mother's weight-adjusted dose.[1]

Infant Levels. Hydrochlorothiazide was not detectable (<20 mcg/L) in the serum of a 28-day-old breastfed infant at about 2 and 11 hours after the mother's dose.[1]

Effects in Breastfed Infants

No electrolyte abnormalities were noted in one 28-day-old infant who was breastfed since birth while his mother was taking oral hydrochlorothiazide 50 mg daily.[1]

Effects on Lactation and Breastmilk

Hydrochlorothiazide in dosages of 100 mg daily in the morning and 50 mg in the afternoon or 50 mg twice daily have been used to successfully to suppress lactation at various times postpartum.[2][3] Intense diuresis with thiazides and thiazide-like diuretics, fluid restriction and breast binding have been used to suppress postpartum lactation.[2][4][5] The added contribution of the diuretic to these measures, which are effective in suppressing lactation, has not been studied. There are no data on the effects of diuretics on established, ongoing lactation.

Alternate Drugs to Consider



1. Miller ME, Cohn RD, Burghart PH. Hydrochlorothiazide disposition in a mother and her breast-fed infant. J Pediatr. 1982;101:789-91. PMID: 7131161

2. Stout G. Suppression of lactation. Br Med J. 1962;1:1150. Letter. PMC: PMC1958377

3. Reisfield DR, Paret FL. Value of a diuretic in suppressing breast engorgement. J Med Soc N J. 1966;63:458-61. PMID: 5341754

4. Healy M. Suppressing lactation with oral diuretics. Lancet. 1961;277:1353-4.

5. Reiher KH. [Suppression of lactation by stimulation of diuresis] . Zentralbl Gynakol. 1963;85:188-90. PMID: 13973786

Hydrochlorothiazide Identification

Substance Name


CAS Registry Number


Drug Class

Breast Feeding


Antihypertensive Agents

Thiazide Diuretics

Administrative Information

LactMed Record Number



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Further information

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