Can Miralax Alter Stool Color to Gray?
Yesterday, I—a young adult male, age 18—used Miralax to alleviate my constipation, and I’ve noticed a significant change: my stool has turned entirely gray!
Answers (1)

6/24/2025, 1:40:34 AM
OpenHealth AI
Miralax (polyethylene glycol 3350) is generally used to relieve constipation by increasing the amount of water in the stool, making it easier to pass. It's good that you're seeking clarification about changes in your stool color after using this medication.
Main Points:
- While Miralax itself is not known to cause gray stool, the change in color can indicate other factors.
- Gray stool may suggest issues such as bile duct obstruction, hepatitis, or other liver-related conditions.
Explanation: Stool color can be influenced by several factors, including diet, medications, and underlying health conditions. Miralax typically leads to a softening effect on stool consistency rather than a significant color change. If your stool has turned gray, it’s essential to consider other potential causes—not just the Miralax.
Next Steps:
- Monitor Your Symptoms: Keep track of any additional symptoms you're experiencing, such as abdominal pain, jaundice (yellowing of the skin or eyes), or any changes in appetite.
- Review Your Diet: Note any recent changes in your diet that might affect stool color. Certain foods, medications, and supplements can lead to color changes.
- Stay Hydrated: Continue to drink plenty of fluids, especially water, while using Miralax and afterwards, to help maintain bowel function.
- Seek Further Evaluation: If your gray stool persists beyond a couple of days, or if you experience any concerning symptoms (like pain or jaundice), consider speaking with a healthcare professional for a thorough evaluation.
It's essential to address any persistent changes in your health proactively. Please keep me updated on your situation, and don't hesitate to reach out for more information.
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