common side effects of protonix
Pantoprazole has been studied extensively in clinical trials, with over 11,000 people worldwide having been evaluated. In these studies, side effects are always documented. Based on these studies, the most common side effects of pantoprazole were: 1  Headaches. 2  Diarrhea. 3  Nausea. 4  Flatulence. 5  Abdominal pain. 6  Insomnia. 7  Rash. 8  Burping. 9  High blood sugar levels (hyperglycemia). 10  Vomiting. 11  Abnormal liver function tests.