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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  • Aquatab DM, Biotuss DM, Broncotron, Cheracol-D, Coricidin HBP Chest Congestion & Cough Liqui-Gels, DayQuil Mucus Control DM, Delsym Cough Plus Chest Congestion DM, Fenesin DM IR, Mucinex DM, Pecgen DMX, Phanatuss, Phlemex, Q-Tussin DM, Robitussin Cough + Chest Congestion DM, Safetussin DM, Tusnel Diabetic, Tussin DM, Tussin DM Clear, Vicks 44E, Zyncof
  • 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)