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Methenamine Hippurate use while Breastfeeding

Drugs containing Methenamine Hippurate: Uribel, Hiprex, Phosphasal, Urogesic Blue, Urimax, Cystex, Ustell, Uta, Mandelamine, Hyophen, Show all 60 »Urex, Urised, Urelle, UTICAP, Uretron DS, Darpaz, Vilamit MB, Uretron, Uro-MP, Phosenamine, Uro Blue, Prosed EC, Azuphen MB, Utira-C, UriSym, UR N-C, Urimar-T, Vilevev MB, Uro-458, Cystemms-V, Urisedamine, Hyolev MB, Indiomin MB, Urolet MB, Urophen MB, Methylphen, Uroqid-Acid No2, Utac, Visqid AA, Uramit MB, Urin D/S, UroAv-81, Darcalma, MSP-Blu, MHP-A, Usept, Uritact DS, Utira, Utrona, Uritact-EC, Utrona-C, UroAv-B, Prosed DS, Dolsed, Atrosept, Uritin, Trac Tabs 2x, Uro-L, Urapine, Uro-Phosphate

Methenamine Hippurate Levels and Effects while Breastfeeding

Summary of Use during Lactation

Methenamine passes into milk in small quantities and appears safe to use, even while nursing a newborn.

Drug Levels

Maternal Levels. Six mothers nursing newborn infants were given methenamine hippurate 1 g orally. Five hours after the dose, a mean methenamine concentration of 7 mg/L was found in milk. In two other women, milk concentrations averaged 9.1 mg/L 2 to 3 hours after a 1 g dose of methenamine hippurate orally and 4.3 mg/L 6 to 7 hours after the dose. Based on the amount of milk ingested, the authors calculated the dose the infants received to be 0.05 to 0.1 mg/kg which is about 1% of the adult dose.[1]

Infant Levels. Relevant published information was not found as of the revision date.

Effects in Breastfed Infants

Four newborn infants were allowed to breastfeed in one study after a maternal dose of 1 g of methenamine hippurate. No adverse effects were reported.[1]

Effects on Lactation and Breastmilk

Relevant published information was not found as of the revision date.

Alternate Drugs to Consider

Methenamine Mandelate


1. Allgen LG, Holmberg G, Persson B, Sorbo B. Biological fate of methenamine in man. Acta Obstet Gynecol Scand. 1979;58:287-93. PMID: 484222

Methenamine Hippurate Identification

Substance Name

Methenamine Hippurate

CAS Registry Number


Drug Class

Anti-Infective Agents, Urinary

Administrative Information

LactMed Record Number


Last Revision Date



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Further information

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