Diphenhydramine is an antihistamine used to relieve symptoms of allergies, such as sneezing, runny nose, and itching, as well as common cold symptoms. It also serves to induce sleep and alleviate cough from minor throat irritation. By blocking histamine receptors, Diphenhydramine effectively reduces allergic responses and helps dry up secretions. Additionally, it has sedative properties, making it useful for sleep disturbances. In summary, Diphenhydramine is effective in managing allergy symptoms and promoting sleep.
Diphenhydramine works by selectively antagonizing H1 histamine receptors, thereby inhibiting the effects of histamine during allergic reactions.






