Gaviscon Advance Liquid (Peppermint Flavour) is a tasty treatment for heartburn indigestion and reflux. The Gaviscon Advance formula contains double the concentration of active ingredients as Gaviscon Original. Technically referred to as dyspepsia reflux occurs when the acidic contents of the stomach seep back into the oesophagus or food pipe This causes burning sensations and pain (heartburn and indigestion) in the short term while if on-going can lead to irritation and swelling of the tube (reflex oesophagitis). The sodium alginate in Gaviscon helps to form a layer over the stomach contents stopping them from leaking into the oesophagus. At the same time the sodium carbonate acts as an antacid neutralising the harshness and greatly reducing the unpleasant symptoms you experience.