Mucinex Nightshift Cold & Flu is a Nighttime Multi-Symptom Relief medicine for your Cold & Flu Symptoms. Mucinex Nightshift Cold & Flu helps reduce fever, relieve pain, headache, cough, runny nose, sneezing and sore throat . Mucinex is the #1 most trusted brand among doctors for cold and cough symptoms for themselves and their families* and #1 Pharmacist Recommended Brand †. This product contains 6 Fluid Ounces. Use as directed, for Adults and Children 12 years of age and over.