Robitussin Adult Nighttime Cough DM Liquid Maximum Strength is a cough syrup designed to provide relief from coughing and help you sleep. Each pack contains two 4-ounce bottles of the liquid medication. Robitussin Adult Nighttime Cough DM Liquid Maximum Strength is a reliable option for relieving nighttime cough symptoms. Its maximum strength formula and nighttime relief properties make it a popular choice for individuals seeking relief from persistent coughing at night.