Medication Conflict ?
Stone Fighter #F48373Apr 8, 2026👁️ 451❤️ 197- Strategy
- Patient journey
I regularly produce kidney stones and undergo removal procedures approximately every two years. My urologist recently prescribed a new treatment regimen that I began last week, which includes:
1. Potassium Citrate (for stone prevention) 2. Hydrochlorothiazide (HCTZ) (for stone prevention) 3. Methenamine with Vitamin C (for UTI prevention)
Based on my initial research, there appears to be a potential conflict between the potassium citrate and the methenamine. Potassium citrate is intended to make the urine more alkaline to prevent stone formation; however, methenamine requires an **acidic** environment (a pH below 6.0) to be effective. In acidic conditions, methenamine converts into formaldehyde to eliminate bacteria which will suppress UTI occurrence.
It feels as though these two medications might neutralize each other and become ineffective when combined. Has anyone else been prescribed this specific combination?
\-Ronnnie
Comments (1)
Stone Fighter #28C522Apr 8, 2026Doc here, you are absolutely correct. Potassium citrate alkalinises the urine to reduce the risk of recurrence or further growth of certain stones, including oxalate stones (the commonest by far). Methenamine/vit C will only work in an acidic environment, as you say. The evidence of benefit of HCT to prevent kidney stones is very sketchy to say the least, previous studies suggested some benefit but more recent studies have repeatedly suggested not.
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