How much diphenhist can a 4 year old take?

Diphenhydramine (commonly known as Benadryl) dosing for children typically depends on their weight and specific product formulations. For a 4-year-old, the usual dose is around 1 mg per kg of body weight, not exceeding 25 mg per dose, and it should not be used more than every 4 to 6 hours. However, it's crucial to consult a pediatrician or healthcare provider before administering any medication to ensure safety and proper dosing. Always follow the instructions on the medication label.