Used primarily as an antitussive agent to relieve cough symptoms associated with colds or respiratory conditions. It acts on the brain's cough center to suppress the cough reflex, making it effective for non-productive coughs. Commonly found in over-the-counter cough syrups, lozenges, and tablets. It is often combined with other medications like antihistamines, decongestants, or expectorants to provide broader symptom relief. In some cases, it is also explored for off-label uses, such as managing neurological conditions or as a potential treatment for certain psychiatric disorders due to its effects on NMDA receptors. Always used under recommended dosages to avoid adverse effects.