What is the primary action of anti-tussive medications?

The primary action of anti-tussive medications is to suppress the cough reflex. These medications are specifically designed to reduce or eliminate the urge to cough, which is particularly useful in cases where a cough is dry and non-productive, causing discomfort or annoyance without serving a beneficial purpose, such as clearing mucus from the airways. By inhibiting the cough reflex, anti-tussives help provide relief for conditions like a dry cough associated with a cold or respiratory infection.

Other options like reducing fever, controlling seizures, or treating muscle movement disorders pertain to medications that address entirely different symptoms and conditions, and therefore do not relate to the primary function of anti-tussive medications.