Rugby gas relief softgels relieve bloating, pressure and fullness commonly referred to as gas and/or flatulence. Simethicone, the active ingredient in this gas relief medication, provides fast gas relief because its 180 milligrams of simethicone per softgel is the highest strength gas relief available over the counter. ● Simethicone, Ultra Strength, 180 mg, Softgels. ● Antigas. ● Rugby Ultra Strength Simethicone provides fast relief of gas, pressure, bloating and discomfort. ● There are 180 milligrams of gas-bubble-bursting simethicone in each softgel.