Is Miralax Safe for Children?

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Constipation is a common issue in children and can be distressing for both kids and parents. One of the most popular over-the-counter solutions for constipation is Miralax (polyethylene glycol 3350). It’s often recommended by healthcare professionals (HCPs) because it’s easy to use, effective, and generally well-tolerated. However, concerns about its safety—especially in children—have prompted many parents to seek more information.

Here’s a comprehensive guide to help you understand whether Miralax is safe for children, its potential side effects, and alternative treatments.

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Is Miralax Safe for Kids?

Miralax is widely used off-label for children with constipation. While the U.S. Food and Drug Administration (FDA) hasn’t specifically approved Miralax for kids under 17, numerous studies and professional guidelines support its safety and efficacy. For example, the American Academy of Pediatrics (AAP) considers Miralax a first-line treatment for chronic constipation in children.

A 2003 study observed 83 children with long-term constipation who used Miralax for about nine months. The results showed that it was safe and effective in most cases. Additionally, polyethylene glycol 3350 does not get absorbed into the bloodstream, which makes it less likely to cause systemic side effects.

While MiraLAX is widely used and generally considered safe, some parents have reported behavioral changes in their children—such as mood swings, anxiety, or aggression. In response to these concerns, the FDA funded a study in 2014, led by the Children’s Hospital of Philadelphia (CHOP), to explore whether there could be a link between these symptoms and the medication. CHOP completed enrollment in 2017 and has been analyzing the data, though results have not yet been published. In the meantime, most healthcare providers still consider MiraLAX a safe and effective option for treating constipation in children. If you have any concerns, it’s always best to talk to your child’s doctor.

How Miralax Works

Miralax contains polyethylene glycol 3350 (PEG 3350), an osmotic laxative that works by drawing water into the colon. This softens the stool and makes it easier to pass. It’s available as a tasteless powder that you mix into liquids like water, juice, or milk. The recommended dosage for children varies, so it’s essential to consult your pediatrician before use.

Miralax typically takes 1 to 3 days to produce results. If it seems ineffective, your healthcare provider may suggest adjusting the dosage or exploring alternative treatments.

Common Side Effects of Miralax in Children

Most children tolerate Miralax well, but like any medication, it can cause side effects. The most commonly reported side effects include:

• Bloating

• Gas

• Stomach cramps

• Nausea

Less commonly, some parents have reported behavioral changes in their children, such as:

• Mood swings

• Anxiety

• Aggression

• Nervousness

It’s unclear whether these behavioral changes are directly caused by Miralax, underlying medical conditions, or constipation itself. If you notice any concerning side effects, stop using Miralax and consult your child’s doctor immediately.

Alternatives to Miralax for Children

If you’re hesitant to use Miralax or it doesn’t work for your child, there are other options to consider:

1. Dietary Changes

One of the most effective ways to relieve constipation is through diet. Increasing fiber intake can help soften stools and promote regular bowel movements. High-fiber foods include:

• Fruits: Apples, pears, and berries

• Vegetables: Carrots, broccoli, and spinach

• Whole grains: Oatmeal, brown rice, and whole-wheat bread

Children should also drink plenty of water to stay hydrated, as fiber works best when combined with adequate fluids.

2. Physical Activity

Regular physical activity stimulates digestion and can help prevent constipation. Encourage your child to engage in activities like biking, walking, or playing outdoor games. Reducing screen time and promoting active hobbies can make a significant difference.

3. Toilet Training

Establishing a regular toilet routine can help children with constipation. Encourage your child to sit on the toilet at the same time each day, ideally after meals. A footstool can help improve posture and make bowel movements easier.

4. Other Medications

If dietary and lifestyle changes aren’t enough, other medications may be recommended. Examples include:

• Milk of Magnesia (magnesium hydroxide): A mild laxative that works by drawing water into the intestines.

• Mineral oil: A stool softener that lubricates the colon.

These options are not approved for long-term use in children, so always consult your pediatrician before trying them.

5. Probiotics

Probiotics like yogurt or supplements can help improve gut health and support regular bowel movements. While research on probiotics for constipation in children is still limited, they are generally safe and worth considering as part of a balanced diet.

When to See a Doctor

If your child’s constipation persists despite trying dietary changes, physical activity, and over-the-counter treatments like Miralax, it’s time to consult a healthcare provider. Chronic constipation can sometimes indicate underlying medical conditions that require further evaluation and treatment.

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Frequently Asked Questions

Is Miralax FDA-approved for children?

No, Miralax is not FDA-approved for children under 17. However, it is commonly used off-label for pediatric constipation and is considered safe by most healthcare professionals. Always consult your child’s doctor before starting any medication. 

How long does Miralax take to work in children?

Miralax usually takes 1 to 3 days to produce results. If it doesn’t work within this time frame, consult your pediatrician.

Can Miralax cause behavioral changes in kids?

Some parents have reported behavioral changes in children taking Miralax, such as mood swings and anxiety. However, there is no definitive evidence linking Miralax to these side effects.

What are natural remedies for constipation in children?

Natural remedies include increasing fiber intake, encouraging physical activity, ensuring adequate hydration, and establishing a regular toilet routine.

Are there long-term risks of using Miralax in children?

There is no evidence of long-term risks associated with Miralax use in children. However, it’s best to consult a pediatrician for prolonged use.