Widely used as an antihistamine to relieve allergy symptoms such as rash, itching, and runny nose. Commonly prescribed to prevent and treat nausea, vomiting, and motion sickness due to its action on the central nervous system. Often used as a sedative before surgery or to help patients sleep. Also utilized in combination with opioids or other analgesics for its potentiating effect, enhancing pain relief and sedation. Frequently found in cold and cough preparations due to its ability to suppress coughing and reduce mucus production.