Zantac is the brand name for the drug ranitidine, which is used to treat various gastrointestinal issues, including heartburn, acid reflux, and stomach ulcers. Some synonyms for Zantac include ranitidine hydrochloride, ranitidine acid reducer, and ranitidine antacid. Other drugs in the same class as Zantac include famotidine, cimetidine, and omeprazole, which also have similar uses in treating stomach and digestive problems. It is important to note that Zantac has been recalled in some countries due to concerns about potential cancer-causing ingredients, so it is essential to consult with a healthcare professional before taking any medication.