Which of the following medications is used to suppress the cough reflex?

The medication used to suppress the cough reflex is an antitussive. Antitussives are specifically designed to reduce or eliminate the urge to cough by acting on the central nervous system or by soothing the throat. They can be vital in situations where coughing can lead to complications, such as postoperative care or severe respiratory conditions, helping patients achieve comfort and better sleep.

While anticonvulsants are used to control seizures, antidepressants are intended to treat mood disorders, and antibiotics are prescribed to combat bacterial infections, none of these categories of medication are aimed at suppressing coughing. Each has a distinct therapeutic effect that does not overlap with the function of an antitussive. Thus, the correct answer is clearly the antitussive, which directly addresses the suppression of the cough reflex.