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Simethicone, also known by its trade names Phazyme and Mylicon, is used as an oral antifoaming agent. It works by reducing the surface tension of bubbles, causing them to coalesce into larger bubbles that can be passed more easily by belching or flatulence. It is the active ingredient in drugs such as Gas-X. Chemically, simethicone is a mixture of dimethylpolysiloxanes.
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