The Basics
What is Methenamine?
An antibiotic that eliminates bacteria that cause urinary tract infections.
Brand names for Methenamine
Hiprex, Mandelamine, Urex
How Methenamine is classified
Anti-Infective Agents – Urinary, Antibacterial Agents
Methenamine During Pregnancy
Methenamine pregnancy category
Category CNote that the FDA has deprecated the use of pregnancy categories, so for some medications, this information isn’t available. We still think it’s useful to list historical info, however, given what a common proxy this has been in the past.
What we know about taking Methenamine while pregnant
N/A
Taking Methenamine While Breastfeeding
What are recommendations for lactation if you're taking Methenamine?
Both the hippurate and mandelate salts of methenamine pass into milk in small quantities and appear acceptable to use, even while nursing a newborn.
Maternal / infant drug levels
Both the hippurate and mandelate salts of methenamine pass into milk in small quantities and appear acceptable to use, even while nursing a newborn.
Possible effects of Methenamine on milk supply
Relevant published information was not found as of the revision date.
Possible alternatives to Methenamine
Methenamine Hippurate, Methenamine Mandelate.
List of References
Lactation sources: Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK501922/1. Allgen LG, Holmberg G, Persson B et al. Biological fate of methenamine in man. Acta Obstet Gynecol Scand. 1979;58:287-93. PMID: 484222
Disclaimer: This material is provided for educational purposes only and is not intended for medical advice, diagnosis, or treatment. Consult your healthcare provider with any questions.
