A cough medicine is a medicinal drug used to treat coughing and related conditions. Dry coughs are treated with cough suppressants that suppress the body's urge to cough, while productive coughs are treated with expectorants that loosen mucus from the respiratory tract. These medicines are widely available in the form of cough syrup, also known as linctus. Codeine is one of the strongest cough suppressants known and a number of...