Mucinex Fast-Max Adult Night Time Cold and Flu Liquid relieve your worst cold symptoms with mucus-busting power and maximum-strength medicines. And by night, Mucinex Fast-Max Night Time relieves your worst symptoms to help you get to sleep. Mucinex Fast-Max Adult Night time Cold and Flu Liquid contains Acetaminophen pain reliever and fever reducer. Diphenhydramine HCl cough suppressant and antihistamine, phenylephrine HCl nasal decongestant. Mucinex helps relieve headache & fevers, controls cough, relieves nasal congestion, and relieves runny nose & sneezing.