Rennie Orange Flavour Tablets Rennie Orange Flavour Tablets give the same fast, effective relief as the rest of the Rennie range but offer a refreshing alternative to mint flavour tablets. They are antacid tablets which quickly turn excess acid into water & other natural substances to provide relief from indigestion, heartburn, acid indigestion, dyspepsia, hyperacidity, nervous indigestion, flatulence, upset stomach, indigestion during pregnancy & biliousness.