Hi, Diane! Here is what I just read regarding it...
Systemic Effects:
Some absorption of the component ions of the saline cathartics does occur, and in certain instances they may produce systemic toxicity. This is especially true for magnesium salts, since 20% or more of the administered cation is absorbed. If renal function is normal, the absorbed magnesium is rapidly excreted. However, if a magnesium cation is given to an individual with impaired renal function, the accumulation of magnesium ion in the body fluids may be sufficient to cause magnesium intoxication.
In most instances, salts that gain access to the systemic circulation are rapidly excreted by the kidneys.
After reading that, I hate to say it, but I'd wait to talk to your dr to make sure it's all good. Maybe Dr. Bill will see this and know more.
Good luck!!!!!
Nicki