Constipation Management in Pediatric Patients

Treatment Guidelines

• The American Academy of Pediatrics recommends monitoring for dehydration and ensuring adequate fluid intake when using magnesium laxatives in children, with considerations for the patient's age, clinical state, and ability to comply with the medication regimen 1
• For children, effective bowel preparation regimens include PEG-3350 at a dose of 1.5 g/kg/day for 4 days, one-day PEG-3350 preparations, or clear liquids for 24 hours along with normal saline enema (10 mL/kg) for infants with normal or frequent bowel movements 1
• Maintenance of adequate hydration during treatment is crucial in children, and the selection of bowel preparation regimens should consider the patient's age, clinical state, and ability to comply with the medication regimen 1

Contraindications and Precautions

• Magnesium-based preparations are contraindicated in patients with renal insufficiency due to the risk of hypermagnesemia, as recommended by the National Kidney Foundation, and intestinal obstruction should be ruled out before initiating treatment with magnesium citrate in children 1
• Patients with creatinine clearance <20 mg/dL should avoid magnesium oxide due to the risk of hypermagnesemia, and intestinal obstruction should be ruled out before initiating treatment with magnesium oxide 2, 3

Alternative Treatments

• First-line options for treatment include fiber supplements, particularly psyllium, with adequate hydration, and polyethylene glycol (PEG) 17g/day, as recommended by the American Gastroenterological Association 2
• Magnesium oxide is a second-line option, starting at a lower dose of 500-1000 mg/day, with a maximum dose of up to 1.5 g/day, and may increase complete spontaneous bowel movements per week, with a mean difference of 4.29, and improve stool consistency based on the Bristol Stool Form Scale 2, 4
• Sodium picosulfate plus magnesium citrate (SPMC) in a split-dose regimen has shown superior bowel cleansing and better acceptability compared to day-before regimens for colonoscopy preparation in children, according to the American Society for Gastrointestinal Endoscopy 1
• Magnesium oxide at 125 mg three times daily (for children <20 kg) or 250 mg three times daily (for children >20 kg) has shown effectiveness for chronic constipation, as recommended by the North American Society for Pediatric Gastroenterology, Hepatology and Nutrition 1
• Prophylactic laxatives, including magnesium oxide, should be initiated when opioids are prescribed to prevent opioid-induced constipation, and ensure adequate fluid intake when using magnesium laxatives, considering combining with other measures such as increased physical activity to enhance efficacy 4, 3
• For patients with renal insufficiency, consider alternative laxatives such as polyethylene glycol (PEG) 2
• Treatment with magnesium oxide has a higher response rate compared to placebo, with a relative risk of 3.93, and is generally well-tolerated with minimal side effects compared to placebo, but possible side effects include diarrhea and abdominal discomfort 2