What is the maximum single pediatric dose of diphenhydramine?

What is the maximum single pediatric dose of diphenhydramine?

• A. 50 mg
• B. 25 mg
• C. 75 mg
• D. 100 mg

Answer: (B)

In pediatric dosing, it's essential to give a weight-based amount at one time but cap how much can be given in a single dose to prevent overdose and adverse effects. Diphenhydramine is typically dosed around 1 mg per kilogram per dose, with a maximum per-dose limit of 25 mg. That cap protects against excessive sedation and anticholinergic effects like dry mouth, urinary retention, fast heart rate, and potential confusion or seizures in smaller children. Because higher single doses increase these risks, the safe per-dose maximum for a child is 25 mg. Doses well above this limit are not used as a standard single-dose amount in pediatric patients.

In pediatric dosing, it's essential to give a weight-based amount at one time but cap how much can be given in a single dose to prevent overdose and adverse effects. Diphenhydramine is typically dosed around 1 mg per kilogram per dose, with a maximum per-dose limit of 25 mg. That cap protects against excessive sedation and anticholinergic effects like dry mouth, urinary retention, fast heart rate, and potential confusion or seizures in smaller children. Because higher single doses increase these risks, the safe per-dose maximum for a child is 25 mg. Doses well above this limit are not used as a standard single-dose amount in pediatric patients.