Need More Magnesium info

Magnesium question
Can someone explain what is the difference between Magnesium sulfate Magnesium citrate and Magnesium oxide, please. Does all Magnesium have a laxative effect? I know that one of these Magnesium type is used in the very famous antacids (PPIs)Prevacid and Nexium as a main constitution. Those who take these prescription medicines often complain about tenderness or tightness around the Liver or Right rib cage or Gallbladder area. Is it possible that the gallbladder or the Liver is softened or enlarged due to the Magnesium ???? in the antacid. Could side effects of such antacids be a flaring up of Gallbladder problems?
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