When you drink Epsom Salt it can cause diarrhea, bloating, and/or an upset stomach.
Epsom Salt when taken internally can help get rid of and relieve constipation since Epsom Salt works as a natural laxative.
So if you're having trouble with pooping and are constipated you can get your bowels moving by adding a bit of Epsom Salt to a glass of water and then drink it slowly.
Within a few minutes or so you should be able to poop and not be constipated anymore.