A cough medicine (or linctus, when in syrup form) is a medicinal drug used in an attempt to treat coughing and related conditions. For dry coughs, treatment with cough suppressants (antitussives) may be attempted to suppress the body's urge to cough. However, in productive coughs (coughs that produce phlegm), treatment is instead attempted with expectorants (typically guaifenesin, in most commercial medications) in an attempt to loosen mucus from the respiratory tract. There is no good evidence for or against the use of these medications in those with a cough. Even though they are used by 10% of American children weekly, they are not recommended in children 6 years of age or younger due to lack of evidence showing effect, and concerns of harm. Dextromethorphan (DXM) may be modestly effective in decreasing cough in adults with viral upper respiratory infections. In children however it has not been found to be effective.
Contributions by Jmh649, Gandydancer, and JohnSawyer.