Gelusil is an over-the counter drug that treats heartburn, acid indigestion and gas distributed by WellSpring Pharmaceutical Corporation. Its main ingredients are aluminum hydroxide, magnesium hydroxide and simethicone.
It was first used in 1939, made by the William R. Warner & Co., Inc., predecessor to Warner-Lambert[1]. It was first trademarked in 1940 as a medicinal preparation for the "Rational Control of Gastrointestinal Hyperacidity.[2]"