Gaviscon Cool Tablets provide relief from the pain and discomfort of heartburn and acid indigestion which for example, can occur after meals or during pregnancy. They belong to a group of medicines called 'reflux suppressants', which form a protective layer on the top of the stomach contents to prevent stomach acid escaping from the stomach where it works into the food pipe causing pain and discomfort. Sodium Alginate Sodium Bicarbonate Calcium