Maximum Strength Mucinex Sinus-Max Day and Night is an OTC medicine for relief of your Multi-symptom Sinus Relief. Maximum Strength Mucinex Sinus- Max Day helps relieve pain, sinus pressure, headache, cough, congestion, thins & loosens mucus and chest congestion. Maximum Strength Mucinex Sinus- Max Night helps relieve pain, sinus pressure, nasal congestion, cough, and runny nose & sneezing.