Simethicone. Anti-gas. Fast acting pressure; bloating; discomfort. Mylanta Gas Chewable Tablets quickly relieve the bloating, pressure and discomfort of gas. Mylanta Gas Chewable Tablets are made with the most effective medicine available to quickly relieve gas symptoms. Mylanta Gas Chewable Tablets are great tasting. Mylanta Gas is also available in easy-to-swallow softgels. Each tablet contains: calcium (66 mg).