Gaviscon Double Action Mint Liquid acts quickly and potently against the burning sensations and pain caused by heartburn and indigestion. Medically known as dyspepsia this condition is common but also easily treatable. Gaviscon Advance Mint Liquid fights it in two different ways. Dyspepsia is caused by acid reflux. This means that the acidic contents of the stomach flow back into the oesophagus (or food pipe) where they start to damage the lining and cause a burning sensation. Repeated occurrences can lead to irritation and even inflammation (reflux oesophagitis). Gaviscon Double Action acts on the one hand as an antacid neutralising the refluxing stomach fluids with a combination of sodium bicarbonate calcium carbonate and sodium alginate all effective natural acid neutralisers. At the same time the liquid Gaviscon formulation forms a physical 'raft' over the stomach contents blocking them from returning into the oesophagus and causing short term discomfort and long term damage.