Preventing recurrent UTIs without antibiotics: cranberry, methenamine and vaginal oestrogen

Design

Overview of systematic reviews of randomised trials

Population

27 systematic reviews; women aged ≥16 with recurrent UTI

Primary outcome

Prevention of recurrent UTI by non-antibiotic interventions

Effect

Support for cranberry, methenamine hippurate and vaginal oestrogen (postmenopausal); others inconclusive

Recurrent urinary tract infection — two or more in six months, or three in a year — is common in general practice and a major driver of antibiotic use. This overview, published in the British Journal of General Practice on 19 October, gathered 27 systematic reviews of randomised trials published between 2014 and 2025 on non-antibiotic prevention in women aged 16 or over.

Three options had systematic-review support: cranberry products, methenamine hippurate, and vaginal oestrogen in postmenopausal women. Questions remain about the best cranberry preparation, how long to continue methenamine, and how to help women keep using vaginal oestrogen. For probiotics, D-mannose, herbal medicines, acupuncture and vaccines, the reviews concluded that stronger evidence is needed. More fluid helped women whose usual intake was low. Few reviews reported acceptability or adherence.

An overview summarises reviews rather than re-analysing trials, so it does not give pooled effect sizes, and quality of the underlying trials varies. Still, it gives a family doctor a clear first conversation. In India, cranberry products and vaginal oestrogen are easy to obtain; check local availability of methenamine hippurate before suggesting it.

• Confirm recurrence with at least one culture before starting prevention.
• In postmenopausal women with recurrent UTIs, consider vaginal oestrogen first, and explain that it needs regular long-term use.
• Cranberry products are a reasonable option to discuss; preparations vary, so set a trial period and review.
• Where available, methenamine hippurate is an alternative to antibiotic prophylaxis; it needs acidic urine and normal kidney function.
• Ask about fluid intake; women who drink little may benefit from more.

Why it matters

It gives family doctors evidence-backed alternatives to long-term antibiotics for one of their commonest repeat problems.

Don't overread it

D-mannose and probiotics are popular but the reviews found the evidence too weak to recommend them.

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