Dextromethorphan is a cough suppressant. It affects the signals in the brain that trigger cough reflex.

Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.

Dextromethorphan and guaifenesin is a combination medicine used to treat cough and chest congestion caused by the common cold, infections, or allergies.

Dextromethorphan will not treat a cough that is caused by smoking, asthma, or emphysema.

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  • Dizziness; drowsiness; stomach upset.

    Seek medical attention right away if any of these SEVERE side effects occur while taking dextromethorphan / guaifenesin:
    Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue).
  • (oral liquid, oral capsule, oral tablet, extended release, oral elixir, oral tablet, oral capsule, extended release, oral suspension, extended release, oral granule)