effects of magnesium toxicity
According to the NIH, symptoms of hypermagnesemia, magnesium toxicity, or magnesium overdose may include: 1  nausea and vomiting. 2  lethargy. 3  muscle weakness. 4  irregular heartbeat.5  low blood pressure. 6  urine retention. 7  respiratory distress. 8  cardiac arrest.ccording to the NIH, symptoms of hypermagnesemia, magnesium toxicity, or magnesium overdose may include: 1  nausea and vomiting. 2  lethargy. 3  muscle weakness. 4  irregular heartbeat.