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To reduce the symptoms of acid reflux which may cause heartburn or inflammation of the gullet (oesophagitisTo relieve some of the symptoms caused by ulcers in the stomach and part of the gut called the duodenum.In other conditions where it is helpful to neutralise stomach acid.). ...
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Antacids are base it contains a hydroxyl ion 
they are use to prevent hyperacidity like Kremil-S

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