On those occasions when I just can't deal with four doses of Epsom Salts I have used magnesium citrate. It is an effective laxative, but it does not seem to have the same qualities of relaxing the biliary ducts as the ES. Here is my compromise method of using the liquid mag. citrate. At 6 pm I drink a bottle of mag. citrate instead of the ES. At 8 o'clock I take Epsom Salts to make sure the biliary ducts are relaxed and able to pass large stones if necessary. The next morning my first dose is also Epsom Salt to hopefully flush out any remaining trash. For the fourth dose I take another bottle of mag. citrate for a final flush of the colon. This method works much better for me than mag. citrate only; but still gives some respite from the always awful Epsom salts.