Magnesium citrate, a magnesium preparation in salt form with citric acid, is a chemical agent used medicinally as a saline laxative and to completely empty the bowel prior to a major surgery or colonoscopy. It is available without a prescription, both as a generic or under the brand name Citromag or Citroma. It is also used as a magnesium supplement in pills. The magnesium content of magnesium citrate corresponds to about 11% by mass.
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Some articles on magnesium citrate:
... to correctly follow the prescribed doses extreme magnesium overdose can result in serious complication such as slow heart beat, low blood pressure, nausea, drowsiness, etc ... Magnesium citrate solutions generally produces bowel movement in one half to six hours ...