Order: Ceftriaxone 300 mg IV Q12H for a 6 month old infant with a serious infection who weighs 18 lbs. The recommended dosage is 50-75 mg/kg/day in divided doses BID. Prove mathematically (mg/kg/day) the ordered dose and is it safe to give Safe/Unsafe)?
The Correct Answer is ["612.375"]
To calculate the ordered dose of Ceftriaxone in mg/kg/day, we can follow these steps:
Convert the weight to kg:
Weight in kg= Weight in lbs /2.2046
Weight in kg= 18lbs/2.2046≈8.165 kg
Calculate the daily dosage range:
Using the recommended dosage range of 50-75 mg/kg/day:
Minimum daily dosage= 50mg/kg/day × Weight in kg
Maximum daily dosage =75mg/kg/day×Weight in kg
Calculate the ordered dose:
Ordered dose=Dosage per administration × Frequency per day
Ordered dose= 300mg×2times per day= 600mg/day
Now, let's calculate the daily dosage range:
Minimum daily dosage=50mg/kg/day×8.165kg=408.25mg/day
Maximum daily dosage=75mg/kg/day×8.165kg=612.375mg/day
The ordered dose of 600 mg/day falls within the calculated range of 408.25-612.375 mg/day, so the ordered dose is within the recommended dosage range for a serious infection.
Therefore, the ordered dose of Ceftriaxone 300 mg IV Q12H for a 6-month-old infant weighing 18 lbs is considered safe based on the calculated dosage range.
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Related Questions
Correct Answer is B
Explanation
A. Inability to make audible voice sounds:
This symptom is more indicative of conditions affecting the vocal cords or larynx, such as laryngitis. Tonsillitis primarily involves inflammation of the tonsils and may not directly impact the ability to make audible voice sounds.
B. Erythema of the pharynx:
Erythema (redness) of the pharynx is a common manifestation of tonsillitis. Inflammation of the tonsils and surrounding areas can lead to redness and swelling in the throat.
C. Bark-like cough:
A bark-like cough is often associated with croup, which involves inflammation of the larynx and trachea, not the tonsils. It is a distinct condition from tonsillitis.
D. Hoarseness:
Hoarseness can be a symptom of various conditions affecting the vocal cords or larynx, but it is not a typical manifestation of tonsillitis. Tonsillitis is more commonly associated with sore throat, difficulty swallowing, and erythema of the pharynx.
Correct Answer is ["0.1696"]
Explanation
To calculate the ordered dose by the physician in mg/kg/dose, we need to convert the infant's weight from pounds and ounces to kilograms. One pound is equal to 0.4536 kg and one ounce is equal to 0.02835 kg. Therefore, the infant's weight in kilograms is:
6 x 0.4536 + 3 x 0.02835 = 2.948 kg
The ordered dose by the physician is 0.5 mg IV q 2 hours prn. To find the dose in mg/kg/dose, we divide the dose in mg by the weight in kg:
0.5 / 2.948 = 0.1696 mg/kg/dose
The recommended dosage for a child is 0.1-0.2 mg/kg/dose q2-4 hours prn. The ordered dose by the physician falls within this range, so it is a safe dosage for the infant.
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