Gaviscon Infant Sachets Gaviscon Infant Sachets contain the active ingredients sodium alginate & magnesium alginate which belong to a group of medicines called 'reflux suppressants'. These prevent reflux by stabilising the stomach contents to reduce the occurance of reflux & bringing up of feeds (posseting). Reflux is the process by which the stomach contents flow back up the tube that leads from the mouth to the stomach, which can cause an infant to be sick, spit up more than normal & become distressed. Gaviscon Infant Sachets are sugar free & are suitable for infants aged 1 to 2 years.