What is the function of an antitussive?

An antitussive is specifically designed to suppress the cough reflex. Coughing can be a reflex response to various irritants in the airway; however, in certain situations—such as with a dry cough or when coughing is persistent—suppressing this reflex can provide relief and improve comfort. Antitussives act on the central nervous system or on the cough receptors in the throat and airways, reducing the urge to cough.

In this context, stimulating coughing would be counterproductive for someone seeking relief from ongoing coughs, while enhancing mucus production is more relevant for conditions requiring mucus clearance. Additionally, relief of respiratory allergies relates to symptoms like sneezing and runny nose, rather than cough suppression. Therefore, the main function of an antitussive clearly aligns with its role to diminish the coughing reflex.