Used as an antitussive agent in cough suppressant formulations to relieve dry, non-productive coughs. It works by acting on the central nervous system to reduce the urge to cough. Commonly found in over-the-counter liquid and tablet preparations, often combined with other active ingredients like expectorants, decongestants, or antihistamines for multi-symptom cold and flu relief. Its effectiveness and mild side effect profile make it suitable for use in both adults and children.