I was on Nexium before and ceased it in 1993, because of side effects. Then I went for Protonix and it was my doctorís suggestion. It gave me a great relief, but I could not afford its high price. So again I moved to Nexium with hope. But it was a sad experience. I had a cardiac arrest last month and I stopped the medication. If you need to use this drug, you have to be aware of its side effects.