Mucaine Gel Orange is used to treat acidity, heartburn, indigestion, gastritis (inflammation of the stomach), and stomach upset. It works by neutralising excess stomach acid. Also, it exerts a numbing effect, thereby providing relief from pain due to ulcers or acidic injury in the stomach. In some cases, it may cause common side effects such as constipation, diarrhoea, dizziness, and drowsiness. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions