Mucinex Sinus-Max Severe Nasal Congestion Relief Sinus & Allergy is an over-the-counter medicine that provides targeted nasal congestion relief due to allergies. It's non-drowsy, fast-acting and lasts up to 12 hours, through the day or night. Mucinex Sinus-Max Severe Nasal Congestion Relief helps relieve nasal congestion, sinus congestion and sinus pressure. Mucinex is the #1 Cold brand doctors trust*. This product contains 0.75 FL OZ. It can be used by adults and children 6 years of age and over. ACTIVE INGREDIENTS: Contains Oxymetazoline HCl 0.05%, a topical nasal decongestant. Take only as directed. *IQVIA, ProVoice Survey, August 2023.