What is the recommended dosage of Miralax (polyethylene glycol) for a 6-year-old child?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: October 1, 2025View editorial policy

Personalize

Help us tailor your experience

Which best describes you? Your choice helps us use language that's most understandable for you.

Miralax (Polyethylene Glycol) Dosage for a 6-Year-Old Child

The recommended dosage of Miralax (polyethylene glycol 3350) for a 6-year-old child with constipation is 17 grams (approximately 1 tablespoon or 1 capful) once daily mixed in 4-8 ounces of liquid.

Dosage Guidelines for Children

Miralax (polyethylene glycol 3350) is commonly used for treating constipation in children. The dosing for a 6-year-old falls within the standard pediatric dosing parameters:

  • Standard dose: 17 grams (1 capful/tablespoon) once daily
  • Duration: Usually recommended for short-term use (2-4 weeks) unless otherwise directed by a healthcare provider
  • Administration: Should be mixed in 4-8 ounces of water or other clear liquid until dissolved

Administration Considerations

When administering Miralax to a 6-year-old:

  • Mix thoroughly until the powder is completely dissolved
  • Can be given with or without food
  • Best given in the morning to prevent nighttime accidents
  • Maintain adequate fluid intake throughout the day
  • Effects typically begin within 24-48 hours

Efficacy and Safety

Polyethylene glycol 3350 (Miralax) has been shown to be an effective and well-tolerated treatment for pediatric constipation 1. It works as an osmotic laxative by drawing water into the intestinal tract, softening stool and increasing bowel movement frequency.

Key benefits include:

  • No significant electrolyte disturbances
  • Minimal taste, making it more acceptable to children
  • Can be mixed with various beverages (water, juice, etc.)

Monitoring and Adjustments

Monitor your child's response to treatment:

  • If stools become too loose, reduce the dose by half
  • If constipation persists after 3 days, consult your healthcare provider
  • Watch for signs of dehydration (dry mouth, decreased urination, dizziness)

Important Precautions

  • Do not exceed the recommended dose without medical supervision
  • Discontinue use and seek medical attention if severe abdominal pain, nausea, or vomiting occurs
  • Consult a healthcare provider before use if your child has kidney disease or other chronic medical conditions

When to Seek Medical Attention

Contact your healthcare provider if:

  • Constipation persists after 1 week of treatment
  • Blood appears in the stool
  • Abdominal pain becomes severe
  • Signs of dehydration develop
  • Fever occurs

Remember that while Miralax is generally considered safe for short-term use in children, addressing underlying causes of constipation through dietary changes (increased fiber and fluids) and regular physical activity remains important for long-term management.

References

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.