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Metamucil: 7 things you should know

Medically reviewed by Carmen Pope, BPharm. Last updated on Aug 31, 2023.

1. How it works

2. Upsides

3. Downsides

If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include:

Note: In general, seniors or children, people with certain medical conditions (such as liver or kidney problems, heart disease, diabetes, seizures) or people who take other medications are more at risk of developing a wider range of side effects. View complete list of side effects

4. Bottom Line

5. Tips

6. Response and effectiveness

7. Interactions

There are few significant interactions with Metamucil. Medications that may interact with Metamucil include:

Metamucil may also affect the absorption of other medications and some vitamins and minerals, as a result of medication being detained in the fiber mass in the intestines and then excreted. Taking medications or vitamins and minerals at least two hours before or two hours after Metamucil can prevent this from happening.

Note that this list is not all-inclusive and includes only common medications that may interact with folic acid. You should refer to the prescribing information for folic acid for a complete list of interactions.


Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Metamucil only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Copyright 1996-2024 Revision date: August 31, 2023.