Rennie spearmint is an antacid tablet which quickly relieves indigestion heartburn acid indigestion dyspepsia hyperactivity gastritis nervous indigestion flatulence upset stomach indigestion during pregnancy and biliousness many adults suffer from heartburn indigestion and trapped wind at some point in their lives symptoms range from the pain or discomfort of acid indigestion also known as dyspepsia to the burning chest pain of heartburn and the bloated stomach and flatulence cause