The efficacy and effects of diphenhydramine

　　Diphenhydramine is commonly available in tablet form and is a systemic antihistamine. The functions and effects of diphenhydramine include antiallergic action, adjunctive treatment for insomnia, prevention and treatment of motion sickness, antipruritic effects, and antiemetic properties. Before using diphenhydramine, consultation with a physician is recommended, and instructions should be followed as directed. The analysis is as follows:

　　1. Antiallergic: Diphenhydramine effectively blocks histamine receptors, thereby inhibiting allergic reactions caused by histamine. Clinically, it is commonly used to treat allergic diseases such as allergic dermatitis, acute and chronic urticaria.

　　2. Adjunctive treatment for insomnia: Diphenhydramine has a certain sedative effect and can also be used as a short-term sleep aid to help patients with mild insomnia caused by allergic reactions or other factors fall asleep.

　　3. Prevention and treatment of motion sickness: In addition to its antiallergic effects, diphenhydramine is frequently used to prevent and treat motion sickness, such as car sickness and seasickness. It demonstrates good therapeutic effects on vertigo symptoms caused by vestibular neuritis and motion sickness.

　　4. Antipruritic: Diphenhydramine provides effective relief from skin itching. By blocking the binding of histamine receptors, it reduces histamine-induced irritation of the skin, thereby alleviating pruritus and improving patient comfort.

　　5. Antiemetic: Diphenhydramine can inhibit the vomiting center in the central nervous system, thus reducing or preventing the occurrence of nausea and vomiting. It is commonly used to alleviate symptoms such as motion sickness, car sickness, and pregnancy-related vomiting.

　　During medication, attention should be paid to dosage control to avoid overdose or potential drug interactions.