PENT-AV is a proton pump inhibitor that decreases the amount of acid produced in the stomach.Pantoprazole is used to treat erosive esophagitis (damage to the esophagus from stomach acid), and other conditions involving excess stomach acid such as Zollinger-Ellison syndrome. You should not use this medication if you are allergic to pantoprazole or to any other benzimidazole medication such as albendazole (Albenza), or mebendazole (Vermox). Pantoprazole is not for immediate relief of heartburn symptoms. Heartburn is often confused with the first symptoms of a heart attack. Seek emergency medical attention if you have chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, and a general ill feeling. Heartburn is often confused with the first symptoms of a heart attack. Seek emergency medical attention if you have chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, and a general ill feeling. You should not use this medicine if you are allergic to pantoprazole or to similar medicines such as lansoprazole (Prevacid), esomeprazole (Nexium), omeprazole (Prilosec, Zegerid), or rabeprazole (AcipHex). To make sure pantoprazole is safe for you, tell your doctor if you have: severe liver disease, low levels of magnesium in your blood.