Pan 40 tablet is a medication used to treat conditions caused by excess stomach acid such as gastroesophageal reflux disease (GERD), heartburn, and ulcers. It contains the active ingredient Pantoprazole which works by reducing the amount of acid produced in the stomach. This tablet can also be used to prevent stomach ulcers caused by certain medications. Pan 40 tablets are usually taken once a day before a meal and should be swallowed whole without chewing or crushing.