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.
