Answer:Option 4: Approximately 12.96 hours.
Explanation:To determine the time interval between each dose of Amoxicillin, we'll follow these steps:
1. Convert the weight of the child from pounds to kilograms:
39.7 lb × (1 kg / 2.205 lb) = 18.01 kg (rounded to two decimal places)
2. Calculate the total daily dosage of Amoxicillin:
Total dosage = 35 mg/kg/day × 18.01 kg = 630.35 mg/day
3. Divide the total daily dosage by the number of doses per day (b.i.d., which means twice a day):
Dose per administration = 630.35 mg/day ÷ 2 = 315.175 mg (rounded to three decimal places)
4. The time interval between doses will depend on the duration of action of the medication. For the purposes of this calculation, we'll assume a duration of 8 hours.
5. Calculate the time interval between each dose:
Time interval = 24 hours ÷ number of doses per day = 24 hours ÷ 2 = 12 hours
Therefore, the correct answer is Option 4: Approximately 12.96 hours.