Answer
It is primarily an alginate reflux suppressant. It forms a physical raft over stomach contents rather than relying on systemic absorption.
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
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.