Rennie Orange for fast and active heartburn relief, now in a delicious and refreshing orange flavour. These calcium carbonate tablets neutralise stomach acid providing fast relief from the symptoms of heartburn.Those who suffer with heartburn usually feel a pain in their chest, behind the breastbone or in the upper central abdomen. It occurs when the acid contents from the stomach pass back up through the oesophagus. Try Rennie today and enjoy pain free days. Rennie can be used to offer fast relief from the discomfort caused by: indigestion, heartburn, acid indigestion, nervous indigestion, flatulence, upset stomach, dyspepsia, biliousness indigestion during pregnancy.