Smith Brothers cough drops temporarily relieve cough caused by a cold or irritants, irritated throat, and sore throat, according to Drugs.com. They are not appropriate for treatment of chronic cough or severe cough with excessive phlegm.
Smith Brothers cough drops are over-the-counter cough suppressant for relieving minor cough. The product's active ingredient is menthol, and its inactive ingredients include corn syrup, honey, sucrose, eucalyptus oil, beta-carotene and water, states Drugs.com. Adults and children over age 5 can put one drop in the mouth and allow it to dissolve slowly. Children younger than 5 years old should not use this product.