Ranitidine is a medication that belongs to a class of drugs known as H2 blockers. It works by reducing the amount of acid produced in the stomach, which helps treat conditions like gastroesophageal reflux disease (GERD) and peptic ulcers. This drug was commonly used to relieve heartburn and indigestion. However, in 2020, it was withdrawn from the market in many countries due to concerns about impurities that could potentially increase the risk of cancer. Patients are advised to consult their healthcare providers for alternative treatments.