MiraLAX Dosing for a 5-Year-Old Child with Constipation
The recommended dose of MiraLAX (polyethylene glycol 3350) for a 5-year-old child with constipation is approximately 0.5-0.8 g/kg/day, which typically translates to about 8-12 grams (½-¾ capful) mixed in 4-8 ounces of liquid daily. 1, 2
Dosing Guidelines
Weight-Based Dosing
- The most effective maintenance dose for children is approximately 0.7-0.8 g/kg/day 1, 2
- For a typical 5-year-old weighing 18-20 kg, this equals approximately:
- 12-16 grams daily (¾-1 capful)
- Start at the lower end of the range and adjust as needed
Administration Instructions
- Mix the powder completely in 4-8 ounces of any beverage
- Ensure the powder is fully dissolved before drinking
- Can be given once daily at any time of day
- Best given consistently at the same time each day
Treatment Duration and Monitoring
Initial Treatment Phase
- Expect results within 24-48 hours
- Continue daily dosing until regular bowel movements are established
- Monitor for:
- Frequency of bowel movements (goal: soft, non-painful stool every 1-2 days)
- Consistency of stool (should be soft but formed)
- Resolution of abdominal discomfort
Maintenance Phase
- May need to continue treatment for several weeks to months
- Dose can be adjusted based on response:
- Decrease if stools become too loose
- Increase if constipation persists
Safety Considerations
Advantages of MiraLAX
- Non-habit forming
- Tasteless and easily mixed with beverages
- Well-tolerated in pediatric populations
- Does not cause significant electrolyte disturbances
Potential Side Effects
- Diarrhea (most common) - reduce dose if this occurs 1
- Abdominal bloating or gas
- No significant adverse effects on electrolytes or other laboratory values
Additional Management Recommendations
Dietary and Lifestyle Modifications
- Increase fluid intake throughout the day
- Encourage physical activity
- Increase dietary fiber if fluid intake is adequate
- Establish regular toileting habits
When to Consult a Healthcare Provider
- If constipation persists despite appropriate dosing for 1 week
- If abdominal pain becomes severe
- If blood appears in the stool
- If the child develops fever or vomiting
Important Caution
While the FDA label for MiraLAX states "children 16 years of age or under: ask a doctor" 3, pediatric gastroenterology guidelines and clinical research support its use in children with proper medical supervision. Always consult with your child's healthcare provider before starting treatment.