Using epsom salt internally can be dangerous. Some people have even died from using too much. Great care must be taken if one uses anything more than a small dosage of epsom salt internally.
I fully agree, I tried it for a week with only a pinch a few times a day and felt so dehydrated one day and dizzy etc.! I would not use that there more than once a week if even that.
Like I said all I USED was a PINCH a time or two a day, and that was too much.