Which statement best describes the treatment window for neonatal hypomagnesemia management with magnesium sulfate?

• A. Duration is 30-60 minutes
• B. Duration is 1-2 hours
• C. Duration is 2-3 hours
• D. Duration is 4-6 hours

Answer: (A)

Magnesium repletion in a neonate aims to raise the serum level quickly enough to prevent ongoing symptoms, but safely enough to avoid toxicity. Infusing the magnesium sulfate over about 30 to 60 minutes provides that balance: it delivers an adequate amount to correct the deficit promptly while keeping peak levels from rising too fast, which helps prevent adverse effects such as respiratory depression, hypotonia, or diminished reflexes. This time frame also gives clinicians a window to monitor the infant’s status, watch for signs of toxicity, and adjust the plan as needed. Shorter infusions risk under-correcting the deficit or causing abrupt shifts, while longer infusions slow correction and keep the infant exposed to low magnesium levels longer. After the loading dose, maintenance dosing is guided by ongoing magnesium measurements and the infant’s clinical response, with attention to the immature renal clearance that characterizes neonates.