Maximum Strength Mucinex Fast-Max Day Cold & Flu & Nightshift Night Severe Cold & Flu Caplets combo pack is a Multi-Symptom Relief medicine and All-in-One solution for Cold & Flu symptoms. Day Time Caplets help reduce fever, relieve cough, chest, nasal & sinus congestion that can cause mucus buildup, sinus pressure, minor aches and pains, headache and sore throat. Night Time Caplets help reduce fever, relieve cough, nasal congestion that leads to stuffy nose, minor aches & pains, headache, sneezing, runny nose, sore & itchy throat and allergy symptoms. FSA & HSA ELIGIBLE.