Magnesium and Human Health: Perspectives and Research Directions

Table 8

Clinical manifestations of hypermagnesemia.

Serum magnesium levels	Manifestations
0.70–1.0 mmol/L	Normal level.
2.2–3.5 mmol/L	Nausea, vomiting, facial flushing, urinary retention, ileus, and hypotension.
3.9–5.2 mmol/L	Somnolence, absence of the deep tendon reflex, and complete heart blockage.
>6.5 mmol/L	Respiratory depression, paralysis, and complete heart blockage.
>8.7 mmol/L	Asystole.