Each 10 mL of oral suspension contains sodium alginate 1000 mg and potassium bicarbonate 200 mg as the active ingredients. The other ingredients are calcium carbonate, carbomer, methyl (E218) and propyl (E216) hydroxybenzoates, sodium saccharin, sodium hydroxide, peppermint flavour and purified water. Gaviscon Advance is sugar-free and gluten-free.