Sucralfate
"MAJOR CHOKING HAZARD! 
I've been taking the pill version, instead of the liquid, for a few months. I literally almost died twice from choking on this pill. What they don't tell you is that as soon as you put the pill in your mouth, and it hits moisture, it swells. Put it in water and watch. Because there's no coating, it's hard to get down. This leads to choking until it starts to dissolve. DO NOT take this while you're alone! Other than that, it works well, lol. 
Dissolve it in a cup of warm water then chug it. I wouldn't split it in half because it's more likely to get stuck because of the sharp corners."