Which brand of cough drops is the best?

A cough suppressant's effectiveness depends on the type of cough. Antitussives such as Triaminic, Robitussin and Vicks treat a dry cough, while expectorants made by Mucinex and Robitussin are best for a moist, productive cough, explains About.com.

It is important to use the correct type of cough suppressant so that symptoms do not become worse. Antitussives are effective for a dry cough because they block the cough reflex, while expectorants are effective for a moist cough because they clear mucus out of the airway. If a cold does not accompany the cough, antihistamines and decongestants might not be necessary. These drying agents can make a cough more severe.