Mucinex Sinus-Max Severe Nasal Congestion Relief Clear & Cool is an OTC medicine for relief of your Nasal Congestion symptoms. Mucinex Sinus-Max Severe Nasal Congestion Relief helps relieve nasal congestion, sinus congestion and sinus pressure. Mucinex is the #1 Cold brand doctors trust for themselves and their families*. This product contains 0.75 FL OZ. It can be used by Adults and Children 6 years of age and over.