Metamucil Oral Precautions and Side Effects

  • Precautions

    Before taking this bulk-forming laxative, tell your doctor or pharmacist if you are allergic it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

    Before using this medication, tell your doctor or pharmacist your medical history, especially of:

    • stomach/intestinal blockage
    • difficulty swallowing
    • appendicitis or symptoms of appendicitis (such as nausea/vomiting, sudden or unexplained stomach/abdominal pain)
    • a sudden change in bowel habits that lasts for longer than 2 weeks
    • bleeding from the rectum

    Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

    Some products may contain sugar and/or aspartame. Caution is advised if you have diabetes, phenylketonuria (PKU), or any other condition that requires you to limit/avoid these substances in your diet. Ask your doctor or pharmacist about using this product safely.

    Tell your doctor if you are pregnant before using this medication.

    It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.

    Side Effects

    Gas or stomach cramping may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

    If your doctor has directed you to use this product, remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

    This product must be taken with at least a full glass of water or other liquid (8 ounces/240 milliliters) so that it will not swell in the throat, causing choking. Seek immediate medical attention if after taking this product you have symptoms of choking such as:

    • chest pain
    • vomiting
    • difficulty swallowing/breathing

    A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

    • rash
    • itching/swelling (especially of the face/tongue/throat)
    • severe dizziness
    • trouble breathing

    This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

    In the US -

    Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

    In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.