Gaviscon has a soothing effect that works in 3 mins & lasts up to 4 hours. It works by forming a raft (thick layer) on top of the stomach contents which helps prevent acid coming back up the food pipe. And because it works physically (rather than by entering the bloodstream) it is suitable for use in pregnancy.
How does Gaviscon Advance Work?
The raft acts as a strong physical barrier and helps keep all the components of the stomach contents in the stomach where they work, not letting them seep back up into the oesophagus where they hurt.