Other Information: (DayQuil Cough): Each 15 ml contains: sodium 15 mg. Store at room temperature. Does not meet USP requirements for light resistant packaging. (NyQuil Cough): Each 30 ml contains: sodium 36 mg. Store at room temperature. Misc: Fast cough relief day or night. DayQuil Cough: Soothing tropical blend. Cough suppressant. Dextromethorphan HBr - cough suppressant. 8 hr: powerful cough relief for up to 8 hours. Non-drowsy. Alcohol free. Antihistamine free. www.vicks.com. NyQuil: Soothing cherry. Cough suppressant. Doxylamine succinate - antihistamine, dextromethorphan HBr - cough suppressant. Powerful cough relief so you can sleep. Nighttime relief. Alcohol 10%. www.vicks.com. Parents: Learn about teen medicine abuse. www.StopMedicineAbuse.org.