Antacids are pharmaceutical products used to neutralize stomach acid and relieve symptoms of heartburn, indigestion, and acid reflux. They contain active ingredients such as magnesium hydroxide, aluminum hydroxide, and calcium carbonate, which work quickly to provide relief. Antacids can be taken in various forms, including tablets, liquids, and chewables, making them accessible for different preferences. Their fast-acting nature and over-the-counter availability make antacids a common choice for managing mild gastrointestinal discomfort.