Brompheniramine hydrogen maleate is primarily used as an antihistamine to alleviate symptoms associated with allergic reactions, such as sneezing, runny nose, itchy eyes, and skin rashes. It is commonly found in over-the-counter cold and allergy medications, often combined with other active ingredients like decongestants or pain relievers to provide comprehensive relief. Additionally, it is utilized in veterinary medicine to manage allergic conditions in animals. Its effectiveness in blocking histamine receptors makes it a valuable component in treating mild to moderate allergic responses.