A child weighing 21 pounds is prescribed diphenhydramine by mouth to prevent nausea associated with receiving immunizations. The recommended safe dose for diphenhydramine is 5 mg/kg/day in 4 divided doses. This child's individual dose should not exceed:
a. 12 mg/dose. c. 20 mg/dose.
b. 48 mg/day. d. 12 mg/kg.=
ANS: A
Feedback
A Correct: 21 pounds divided by 2.2 = 9.54 kg X 5 = 47.72. mg/day divided by 4 doses = 11.9 mg, or rounded to 12 mg/dose.
B Incorrect: The question asks for the child's individual dose, not daily dose.
C Incorrect: This is an incorrect result.
D Incorrect: This has changed the recommended safe dose for children.
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