Gaviscon Double Action is a combination of alginate and antacid, designed to relieve heartburn. It works instantly, soothing in just 3 minutes and lasting for up to 4 hours.  It soothes and protects while neutralising the acid in the throat, oesophagus and stomach. It helps suppress gastric reflux.  HOW GAVISCON WORKS As you swallow Gaviscon liquid, it soothes the throat and oesophagus.  When it gets to your stomach, it only takes a few seconds for the sodium alginate in Gaviscon to react with the acid in your stomach to create a protective barrier or raft that floats on top of stomach contents. This raft keeps stomach acid from rising up and causing heartburn.  Gaviscon also contains the antacids sodium bicarbonate and calcium car

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