Pediatric ATI Practice Exam

How much phenobarbital should be administered to a 10 kg toddler with a prescription of 2.5 mg/kg?

1. 6.26 mL

2. 5.00 mL

3. 4.50 mL

4. 7.00 mL

The correct answer is: 6.26 mL

To determine the correct dosage of phenobarbital for a 10 kg toddler with a prescription of 2.5 mg/kg, it is essential to first calculate the total amount of medication needed in milligrams. The calculation involves multiplying the child's weight (10 kg) by the prescribed dosage (2.5 mg/kg): 10 kg × 2.5 mg/kg = 25 mg Next, to administer this dosage accurately, it is necessary to know the concentration of the phenobarbital solution. The standard concentration is typically around 50 mg/mL. Using this concentration, the volume of solution required can be calculated by dividing the total required dose by the concentration: 25 mg ÷ 50 mg/mL = 0.5 mL However, since the answer choice provided is in mL and not the answer calculated, it is necessary to verify the available options if the concentration is different or indeed correct. In this context, the identified volume of 6.26 mL suggests a need to double-check the concentration or form in use because it does not correspond with the logical calculation based on a common concentration. This indicates comprehension of the correct approach to dosage calculation and the necessary parameters for administration based on the