Simethicone is the generic name as well as active ingredient for Gas-X, Gas Aid, Mylanta Gas Relief, and Phazyme. They relieve the bloating, pressure, and fullness that result from gas. Simethicone is an anti-gas (anti-flatulence) medication. It acts in the stomach and intestines to change the surface tension of gas bubbles, enabling smaller bubbles to join together into bigger bubbles. In this way it is believed that gas can be eliminated more easily by belching or passing flatus. Simethicone was approved by the FDA in 1952.
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