What is the strongest expectorant?

Maximum Strength Mucinex (guaifenesin) Children’s Mucinex Chest Congestion (guaifenesin) Mucinex DM (dextromethorphan and guaifenesin) Maximum Strength Mucinex DM (dextromethorphan and guaifenesin) Guaifenesin is the active ingredient in:

  • Mucinex.
  • Robitussin DM.
  • Robitussin 12 Hour Cough & Mucus Relief.

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