I recently purchased TUMS quick paks before going on a mission trip to Haiti. One never knows what one will encounter on these trips so I normally try to take quite a variety of items and over the counter medications with me and then leave them for the people there once it is time to go home. I had purchased these in the past but ended up giving them away and luckily never needing them myself, so I was not sure if this next purchase was a good idea or not. But, I did it anyway. While there, after our meager dinner one evening, one of my group became "ill". I gave him one of the TUMS quick packs and within a matter of minutes he reported that he was feeling significantly better. Then later in the week I had cause to use it myself as indigestion set in (there was a significant amount of rice, beans and plantain in our diet.) I am sold !!!!! It worked quickly, and you did not have to chew a chalky pill. You do, however, have to be careful to swallow it correctly.