Gaviscon Cool Mint Liquid For Heart Burn and Indigestion Pain Relief 300ml Gaviscon Cool Liquid brings fast, soothing and long lasting relief from the pain and discomfort of heartburn and acid indigestion. It can be used to treat gastric reflux (a condition in which the acid stomach contents flow upwards into the foodpipe) and flatulence caused by gastric reflux. It belongs to a group of medicines called reflux suppressants.