Nizatidine is a medication used to treat acid reflux and peptic ulcers. It belongs to a group of drugs called H2 blockers, which work by reducing the amount of acid produced in the stomach. There are various synonyms for Nizatidine, including Axid, Tazac, and Nizax. These names refer to the same medication, and they work similarly to treat the same conditions. Though they may vary in brand names, the active ingredient stays the same in all of them. Therefore, doctors and pharmacists may use these different names for Nizatidine to prescribe or dispense the medication, depending on availability and preference.