Answer
Extra assessment is needed because the selected products contain sodium, potassium and calcium. The mint chewable formulation should not be used in renal failure according to its product warning.
Sources for this answer
- Gaviscon Advance Aniseed flavour Oral Suspension — Current selected SmPCemc · Summary of Product Characteristics
- Gaviscon Advance Mint Chewable — Current selected SmPCemc · Summary of Product Characteristics