What is "simethicone"

n. An oral antifoaming agent, a mixture of polydimethylsiloxane and silica gel, used to treat stomach pain caused by excess gas.

Simethicone is an orally administered anti-foaming agent used to reduce bloating, discomfort or pain caused by excessive gas — mainly swallowed air, with small amounts of hydrogen and methane— in the stomach or intestines. Simethicone is a mixture of polydimethylsiloxane and hydrated silica gel.