What is the antidote for magnesium toxicity?

What is the antidote for magnesium toxicity?

• A. Calcium gluconate
• B. Vitamin K
• C. Naloxone
• D. Flumazenil

Answer: (A)

Calcium gluconate is used to treat magnesium toxicity because calcium opposes magnesium’s effects on the heart and neuromuscular system. When magnesium excess depresses nerve conduction and cardiac function, administering IV calcium gluconate rapidly reverses these life‑threatening effects by stabilizing cardiac membranes and improving neuromuscular transmission. It can quickly restore reflexes and prevent or improve hypotension and respiratory depression. Importantly, calcium gluconate reverses the symptoms but does not lower the actual magnesium level—that reduction occurs as the body eliminates magnesium, especially via the kidneys, or with dialysis if needed. Other antidotes address different toxins (for example, reversal of opioid or benzodiazepine effects), not magnesium.

Calcium gluconate is used to treat magnesium toxicity because calcium opposes magnesium’s effects on the heart and neuromuscular system. When magnesium excess depresses nerve conduction and cardiac function, administering IV calcium gluconate rapidly reverses these life‑threatening effects by stabilizing cardiac membranes and improving neuromuscular transmission. It can quickly restore reflexes and prevent or improve hypotension and respiratory depression. Importantly, calcium gluconate reverses the symptoms but does not lower the actual magnesium level—that reduction occurs as the body eliminates magnesium, especially via the kidneys, or with dialysis if needed. Other antidotes address different toxins (for example, reversal of opioid or benzodiazepine effects), not magnesium.