I do not get much heartburn, but I have a severe problem with upset stomach which I wake up with everyday. I take a gravol every morning and it helps. During the day it doesn't happen much, only if I go too long without eating, and a few other things can bring it on. If I have a nap in the afternoon or early evening, I always wake up with an upset stomach, and have to take another gravol. My doctor is treating me for acid reflux, but I very seldom get heartburn?