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Ask Nurse Lynn: Preventing and Treating Constipation

Question:

Female, 18 years old, Deletion subtype

If my child becomes constipated, can we use Miralax to help it to flow better?

Nurse Lynn’s Response:

Constipation is very common in adults with PWS because of slower gut movement, low muscle tone, and limited activity. Managing it usually takes a mix of daily habits and medications. Eating a balanced diet with fiber from vegetables, fruits, and whole grains can help. Staying hydrated is key—low water intake can make constipation worse. Having a routine, like going to the bathroom at the same time each day (often after meals), and staying active with daily walks or light exercise, can also make a big difference.

Medications are often needed to keep bowel movements regular. One of the most common and safest options is polyethylene glycol, also called Miralax. It works by pulling water into the stool to make it softer and easier to pass. Many adults with PWS take Miralax daily or several times a week to prevent hard stools and painful constipation. Other medications can be used if Miralax isn’t enough, such as milk of magnesia, which also help draw water into the bowel. For more stubborn cases, stimulant medications like senna may be added to help the bowel muscles work better, but these should be used under a doctor’s guidance.

Keeping track of bowel movements in a simple log can help you notice changes early. Since people with PWS may not feel or report pain in the same way as others, it’s important to get medical help quickly if these symptoms happen. Regular check-ins with your doctor are also helpful, especially if you’re taking other medications that can slow the gut and make constipation worse.

Resources:

A Comprehensive Overview of GI Issues in Prader-Willi Syndrome – Prader-Willi Syndrome Association | USA

A descriptive study of colorectal function in adults with Prader-Willi Syndrome: high prevalence of constipation

Evaluation of Individuals with Prader-Willi Syndrome with GI Complaints

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