Methenamine

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What is Methenamine?

Methenamine is a prescription urinary antiseptic used for the long-term prevention of recurring urinary tract infections (UTIs) in patients who experience frequent infections. It works differently from antibiotics—rather than killing bacteria directly, it releases formaldehyde in acidic urine, which creates a hostile environment that suppresses bacterial growth in the bladder. Because it works locally in the urinary tract and doesn't enter systemic circulation significantly, it avoids the antibiotic resistance concerns associated with long-term antibiotic use. It's taken twice daily and works best when urine is kept acidic.

Formaldehyde conversion

Methenamine is converted to formaldehyde in acidic urine, creating a bacteriostatic environment within the bladder that inhibits bacterial growth and adherence without systemic antibiotic exposure.

Resistance-sparing prevention

Because it doesn't work as a traditional antibiotic, long-term Methenamine use doesn't contribute to antibiotic resistance—a major advantage over continuous low-dose antibiotic prophylaxis for recurrent UTIs.

Urine acidification dependency

Works best when urinary pH is low. Vitamin C or other acidifying agents are sometimes used alongside Methenamine to maintain the acidic urine environment needed for optimal formaldehyde release.

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Your care doesn’t end after your visit. Message your care team anytime to discuss side effects, ask questions about your medication, or request a refill.

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