DayQuil Severe Cold & Flu helps you get on with your day, even when you are experiencing coughing, stuffy nose, minor body pain, chest congestion, sinus congestion, sinus pressure, sore throat, headache and fever.. In each 15 mL dose, there are 325 milligrams of acetaminophen to relieve pain and reduce fever; 10 milligrams of dextromethorphan HBr to suppress coughs; 200 milligrams of guaifenesin to break up the congestion that causes coughs; and 5 milligrams of phenylephrine HCl to unclog nasal passages.. There are 24 LiquiCaps™ in a carton: Liquid contained within capsules will be absorbed by your body faster than a tablet; capsules leave no aftertaste..