A cough medicine or cough and cold medicine, also known as cough syrup or linctus when in syrup form, is a medicinal drug used in those with coughing and related conditions. There is no good evidence one way or the other for over-the-counter cough medications. While they are used by 10% of American children weekly, they are not recommended in Canada and the United States in children 6 years or younger because of lack of evidence showing effect and concerns of harm.