Dexchlorpheniramine maleate is primarily used as an antihistamine to alleviate symptoms associated with allergic conditions. It is effective in treating hay fever, allergic rhinitis, and other respiratory allergies by reducing symptoms like sneezing, runny nose, and itchy or watery eyes. Additionally, it is used to manage skin reactions such as hives or itching caused by allergic responses. In some cases, it is included in multi-symptom cold and flu medications to address allergy-related discomfort. Its sedative properties can also help with mild sleep disturbances linked to allergic reactions. However, it should be used cautiously due to potential drowsiness and other side effects.