Vicks NyQuil Cold & Flu LiquiCaps temporarily relieve common cold/flu symptoms such as cough due to minor throat and bronchial irritation, sore throat, headache, minor aches and pains, fever, runny nose and sneezing.. Each LiquiCap contains 325 milligrams of acetaminophen to relieve pain and reduce fever; 15 milligrams of dextromethorphan HBr to suppress coughs and 6.25 milligrams of doxylamine succinate to help you get the rest you need.. There are 16 LiquiCaps™ in a carton: Liquid contained within capsules will be absorbed by your body faster than a tablet; capsules leave no aftertaste..