For occasional/non-chronic heartburn or stomach acid problems I like to take 1 or 2 tablespoons of baking soda in just enough water to disolve it... gulp it down as fast as you can and have a standby glass of water to to rinse/chase this because it tastes terrible. This works instantly, and you'll probably burp a few times right after because the reaction will make a lot of air in your stomach (just like mixing vinegar and baking soda). This is probably not a good idea if you have high blood pressure problems though because of the high amount of sodium. Although I haven't had to do this while on LC because my acid reflux dissapeared the day I started.