: An antihistamine-opioid combination often used for severe nighttime coughing. It is a controlled substance due to the risk of habit formation.

: A combination that suppresses the cough reflex while thinning mucus to make it easier to expel.

Prescription syrups are typically reserved for severe coughs that do not respond to OTC treatments. These are more powerful because they contain narcotic ingredients that act directly on the brain's cough center.