There are no known or expected adverse events associated with the use of Gaviscon® when taken as directed. Aluminum in Gaviscon® Liquid may cause constipation. Magnesium in Gaviscon® Tablets may cause diarrhea. These conditions are very rare and typically would be associated with a very large dose. Unless otherwise directed by your healthcare professional, you should discontinue use if you do experience any side effects, if you have taken Gaviscon® for more than two weeks, or if your symptoms return. If you require additional information, please call us at 1-888-366-7475.