From the FDA Drug Label
children 16 years of age or under: ask a doctor adults and children 17 years of age and older: use once a day stir and dissolve one packet of powder (17 g) in any 4 to 8 ounces of beverage (cold, hot or room temperature) then drink
The 17 gram dose of Miralax (Polyethylene Glycol) is not suitable for a 13-year-old without consulting a doctor, as the label instructs to ask a doctor for children 16 years of age or under 1.
From the Research
Miralax (polyethylene glycol 3350) at the standard adult dose of 17 grams is generally considered safe for a 13-year-old, as it is commonly recommended by pediatricians for constipation in this age group 2. The medication works by drawing water into the intestines to soften stool and increase bowel movements.
Key Points to Consider
- When giving Miralax to a 13-year-old, mix the 17-gram dose (typically one capful) in 8 ounces of water or another beverage and have them drink it once daily.
- It usually takes 1-3 days to work effectively.
- Miralax is considered gentle because it works locally in the gut without being significantly absorbed into the bloodstream.
- Side effects are typically minimal but may include gas, bloating, or diarrhea if the dose is too high.
- If constipation persists beyond two weeks of daily use, or if the child experiences severe abdominal pain, vomiting, or other concerning symptoms, consult with their healthcare provider for further evaluation.
Evidence Supporting the Recommendation
The most recent and highest quality study, published in 2021, supports the use of polyethylene glycol 3350 as a safe and effective treatment for pediatric constipation 2. Additionally, a study published in 2018 found that daily PEG 3350 therapy in children was not associated with sustained elevation of ethylene glycol, diethylene glycol, or triethylene glycol blood levels over levels in matched controls 3.
Important Considerations
- The American Academy of Pediatrics recommends the use of polyethylene glycol 3350 as a first-line treatment for constipation in children 2.
- The medication should be used under the guidance of a healthcare provider, especially if the child has any underlying medical conditions or is taking other medications.
- It is essential to monitor the child's response to the medication and adjust the dose or discontinue use if any adverse effects occur.