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Arch Pediatr Adolesc Med. 2001;155:1074.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

I read with interest the report of hypermagnesemia in a 4-week-old infant caused by magnesium hydroxide administration.¹ Other causes of neonatal hypermagnesemia mentioned by the authors include administration of intravenous magnesium sulfate to the mother for eclampsia and magnesium-containing laxatives or antacids to the infant. I would like to add previously undescribed manifestations and causes of neonatal hypermagnesemia reported in a premature neonate who developed delayed intestinal transit and arrhythmias following the erroneous administration of intramuscular magnesium sulfate for hypomagnesemia prior to transfer to our institution.² Increased gastric residue with mild abdominal distension and delayed passage of meconium for several days were the main features with few episodes of premature ventricular contraction, which resolved spontaneously within a few days. The serum magnesium level was 3.3 mg/dL (1.4 mmol/L). The mother did not have a history of magnesium sulfate therapy before delivery. Investigations revealed that although the infant was prescribed a . . . [Full Text of this Article]