Simethicone is an over-the-counter medication used to relieve symptoms of gas, such as bloating and discomfort. It works by reducing surface tension in gas bubbles, allowing them to combine and be expelled more easily from the digestive tract. Simethicone is often found in products for digestive health and is considered safe for use in both adults and children. It is not absorbed into the bloodstream, making it a non-systemic treatment option.