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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.

First used in 1939 as a liquid, it was created by the William R. Warner & Co., Inc., predecessor to Warner-Lambert(now Pfizer)[1]. It was trademarked in 1940 as a medicinal preparation for the "Rational Control of Gastrointestinal Hyperacidity.[2]"

Today, the drug is sold in the U.S. as a chewable pill.

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