DayQuil Nyquil Combo Pack Cold and Cough Relief 325 mg - 10 mg - 5 mg Strength and 325 mg - 48 Count CartonEach DayQuil LiquiCap contains 325 acetaminophen, 10 milligrams of dextromethorphan HBr and 5 mg phenylephrine HCl. Each NyQuil LiquiCap contains 325 acetaminophen, 15 milligrams of dextromethorphan HBr and 6. 25 milligrams of doxylamine succinate. Acetaminophen is an analgesic and antipyretic. Phenylephrine is used to relieve sinus congestion and pressure. Doxylamine succinate is an antihistamine which will reduce sneezing. Dextromethorphan