Pantoprazole
"I was prescribed Protonix for GERD after having a heart attack.  I had been prescribed Omeprazole prior for the same condition, but after about 3 days, I had a very painful stomach, and eventually my stomach failed to empty and I spent a night over the toilet, throwing up everything I had eaten the afternoon before.  I stopped the Omeprazole, and then tried it again about 3 weeks later, same result.  Protonix was new to me and I decided to give it a chance, but 5 days after taking my first dose, I just spent a day in pain and once again, threw up my dinner and lunch from the day before.  "