The nurse should administer 0.8 mL ceftriaxone IM.
<h3>How to calculate the value?</h3>
Determine the infant's weight in kg: 2.2 lb / x kg
= weight in lb / 1 kg; 2.2 lb / x kg = 17.6 lb / 1 kg.
Cross multiply and x = 8 kg
Find total of one-time dose:
Amount prescribed x kg weight (mg x kg)
= total daily dose; 50 mg x 8 kg = 400 mg
What is the dose needed?
Dose needed = Desired; Desired = 400 mg
What is the dose available?
Dose available = Have; Have = 500 mg
Set up an equation using knowledge about basic equivalents.
Desired x Quantity / Have
= Amount to be given; 400 mg x 1 mL / 500 mg = x mL; 400 x 1
= 400 ÷ 500 = 0.8 mL
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