MiraLAX Dosing for a 52 kg Child
Yes, you can give the full adult dose of MiraLAX (17 grams daily) to a 52 kg child, as children weighing over 40 kg should receive adult dosing.
Weight-Based Dosing Threshold
- Children weighing 40 kg or more should use adult dosing protocols 1, 2
- At 52 kg, this child is well above the 40 kg threshold where pediatric weight-based dosing transitions to standard adult dosing 1
- The standard adult dose of MiraLAX is 17 grams (one capful) dissolved in 4-8 ounces of liquid daily 3
Dosing Considerations and Adjustments
- While the FDA label states "safety and effectiveness in pediatric patients has not been established," extensive research demonstrates PEG 3350 is safe and effective in children 3, 4, 5
- The effective dose range in pediatric studies is typically 0.8-1.1 g/kg/day 4, 6
- For a 52 kg child, this translates to approximately 42-57 grams daily based on weight-based dosing, which means the standard 17-gram adult dose is actually conservative 4, 6
- Parents should adjust the dose to achieve 1-2 soft, painless stools per day 4, 6
Safety Profile
- PEG 3350 is well-tolerated with minimal adverse effects in children 4, 5, 6
- The most common side effect is diarrhea, which resolves by reducing the dose 4, 7, 6
- No significant electrolyte imbalances or serious adverse effects have been reported in pediatric studies 4, 6
Important Caveats
- The FDA label recommends use for 2 weeks or less unless directed by a physician, as prolonged use may result in electrolyte imbalance and laxative dependence 3
- If unusual cramps, bloating, or diarrhea occur, the dose should be reduced or the medication discontinued 3
- The powder must be dissolved in 4-8 ounces of water, juice, soda, coffee, or tea before administration 3