Coral Oral Gel is a therapeutic digestive medication containing a balanced mix of Aluminium hydroxide, Simethicone and Magnesium hydroxide.Taking anticoagulants and citrate salts may increase the side effects of Congel Syrup. Discuss with your doctor if you are on a low magnesium diet, have appendicitis, kidney and bowel problems, and rectal bleeding. If you have an allergy to Congel Syrup or any related medication and food, let your doctor know.