Dimemorfan phosphate is primarily used as an antitussive agent, effectively reducing coughing by acting on the central nervous system. It is commonly included in cough syrups and other formulations to alleviate symptoms associated with respiratory conditions such as colds, bronchitis, and other infections. Its mechanism involves suppressing the cough reflex in the brain, providing relief without significant sedation. Additionally, it is often preferred due to its lower risk of dependency compared to other cough suppressants, making it a safer option for prolonged use in managing chronic coughs.