Alkaline mineral water may reduce effectiveness of certain tablets, study finds

Researchers at Semmelweis University in Budapest examined how strongly alkaline mineral water (pH > 8) interacts with enteric‑coated tablets such as proton‑pump inhibitors Omeprazole and Pantoprazol and some aspirin formulations. Laboratory tests showed that the high pH can alter the dissolution of the protective coating, potentially lowering drug absorption in the intestine.

The study advises that plain water is the safest beverage for taking these medicines. Other drinks that may interfere include coffee, milk and grapefruit juice. Consumers are urged to avoid consuming strongly alkaline mineral water together with the affected tablets to ensure proper therapeutic effect.