What is the appropriate dose of Polyethylene Glycol (MiraLAX) for a 3-year-old child?

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Last updated: April 25, 2025View editorial policy

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From the Research

For a 3-year-old child, the typical Miralax (polyethylene glycol 3350) dosage is 1/2 to 1 teaspoon (2.5-5 grams) mixed in 4-6 ounces of water or juice once daily, as supported by the most recent and highest quality study 1. This medication works by drawing water into the intestines to soften stool and make bowel movements easier. Some key points to consider when using Miralax for a 3-year-old child include:

  • Starting with the lower dose and adjusting as needed based on the child's response
  • Consulting with the child's pediatrician before starting any medication
  • Watching for side effects such as bloating, gas, or diarrhea, and contacting the doctor if these become problematic or if constipation persists after several days of treatment
  • Never exceeding the recommended dose without medical guidance It's also important to note that Miralax is generally considered safe for children when used as directed, and it typically takes 1-3 days to see results 1. Additionally, the use of polyethylene glycol with or without electrolytes is more efficacious than placebo for the treatment of functional constipation, either in adults or in pediatric patients, with great safety and tolerability 1. Some other options for treating constipation in children include:
  • Increasing fluid intake and dietary fiber
  • Using other laxatives, such as psyllium or docusate sodium, although polyethylene glycol is considered more efficacious 2
  • Considering behavioral training and education for the child and parents 3

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.

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