Protonix or Pantoprazole Wyeth's third best selling drug with sales of $1.8 billion has patent that expires in July 2010. Now a judge has ruled that Teva Pharmaceutical can introduce its generic version of this drug, Teva had filed a suit challenging the patent's validity and the judge ruled rejecting Wyeth's request to block the generic version from being marketed. Pantoprazole is used to treat severe inflammation of the esophagus from excess acid production.