Gaviscon Double Action Tablets work instantly to effectively relieve heartburn and indigestion. They also last up to twice longer than normal antacids. The powerful formula contains two antacids and an alginate to quickly neutralise excess stomach acid to relieve pain and discomfort and to form a protective barrier over the contents of the stomach to help prevent acid coming back up into the oesophagus (food pipe). Gaviscon Double Action Tablets are suitable for use during pregnancy and breastfeeding.