definition: Antacids are a class of medications used to alleviate symptoms associated with excess stomach acid, such as acid reflux, heartburn, and indigestion. They work by neutralizing the acid in the stomach, thereby providing relief and restoring a more balanced pH level. Antacids typically contain alkaline compounds, such as calcium carbonate, magnesium hydroxide, or aluminum hydroxide, which chemically react with stomach acid to form a salt and water. This reaction reduces the acidity of the stomach, alleviating discomfort and irritation caused by excessive acid. Antacids are known for their rapid onset of action and are commonly available over the counter in various forms, including tablets, liquids, and effervescent powders. They are generally safe and well-tolerated when used as directed. However, it is important to consult with a healthcare professional for personalized advice and to address any underlying conditions contributing to excessive stomach acid production.