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MUCINEX® MULTI-ACTION™ Congestion, Stuffy Nose & Cough Liquid, 180 mL is a fast-acting, multi‑symptom over‑the‑counter liquid that temporarily relieves chest and nasal congestion, sinus pressure, and both wet and dry coughs by combining guaifenesin to loosen mucus, phenylephrine to decongest nasal passages, and dextromethorphan to suppress coughing, with dosing suggested at 20 mL every six hours for adults and children 12 years and older, up to four doses within 24 hours, while advising caution in users with certain medical conditions such as heart disease, high blood pressure, or when taking MAO inhibitors.