DPH is widely used in the pharmaceutical industry as an antihistamine, primarily to relieve symptoms of allergies, such as sneezing, runny nose, and itchy eyes. It is also effective in treating motion sickness, nausea, and insomnia due to its sedative properties. In addition, DPH is utilized in over-the-counter sleep aids and cold medications. Beyond its medical applications, it is sometimes employed in veterinary medicine to manage allergic reactions in animals. Its ability to block histamine receptors makes it a versatile compound in managing various conditions related to histamine activity.