Vicks Nyquil Severe Cold & Flu Liquid - 8 ozNyquil Severe Liquid (USA): Find relief from severe cold and flu symptoms with Nyquil Severe Liquid. Size: This bottle contains 8 ounces (237 ml) of Nyquil Severe Liquid, providing a sufficient supply to tackle your severe cold and flu symptoms. Maximum Strength Formula: Nyquil Severe Liquid is specially formulated with maximum strength ingredients to provide powerful relief from symptoms such as cough, sore throat, headache, fever, nasal congestion,