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What Are the Side Effects of Mucinex Expectorant?

Mucinex expectorant, or guaifenesin, is an over-the-counter medication used to relieve coughs associated with upper respiratory tract infections. Though effective and safe, it does have some side effects.

  1. Frequency

    • Side effects are generally uncommon with Mucinex, but if any adverse reaction occurs, contact your doctor or pharmacist as soon as possible.

    Common Side Effects

    • The common side effects of Mucinex, when they do occur, are stomach cramps, diarrhea, nausea, vomiting and drowsiness.

    Allergic Reactions

    • The more serious reactions to Mucinex are usually allergic reactions to its ingredients.

    Serious Side Effects

    • Severe allergic reactions to Mucinex can include severe dizziness, difficulty breathing, face, tongue and throat itching and swelling, and a rash. Mucinex reactions can also include increased blood pressure, body aches and rapid heartbeat.

    Warning

    • Should any side effects occur while taking Mucinex, report them to the Food and Drug Administration at (800) FDA-1088.

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