Which sign is most associated with hypermagnesemia?

Which sign is most associated with hypermagnesemia?

• A. Sedated appearance
• B. Increased deep tendon reflexes
• C. Hyperactive signs and tremors
• D. Seizures

Answer: (A)

High magnesium dampens nerve and muscle activity, so excess magnesium produces CNS depression and reduced reflexes. That sedated appearance is the most characteristic sign of hypermagnesemia, and as levels rise deep tendon reflexes often become diminished or absent, with potential for bradycardia or respiratory depression at very high levels. Signs like increased reflexes, tremors, or seizures reflect magnesium deficiency or excessive excitability, not hypermagnesemia, which is why the sedated presentation is the best match.