Nursing Entrance Exam

Nursing Preparation Study Guide

= desireddose = dose on containerlabel

• •

⟹ = • = form and amount in which drug comes (tablet, capsule, liquid) • = amount given to patient For example, Solumedrol 2.5 mg/kg is ordered for a child weighing 18 kg. Solumedrol is available as 125mg/3mL is available. HowmanymLmust the nurse administer? (Problem fromDosageHelp.com) First, begin by identifying the information given. The desired dose is 2.5 mg/kg and the child weights 18 kg. This means that 2.5 × 18 = 45 mg should be administrated. The dose on the container is 125 mg, and the drug comes as a 3 mL liquid. Now, substitute these values into the formula and solve for the unknown. 45 mg × 3 mL = 45 mg × 3 mL = 135(mg)(mL) = 1.08 mL 125 mg 125 mg 1 125(mg) Therefore, the child that weights 18kg should receive 1.08 mL of Solumedrol. This is not the only way we can use the formula. Instead we can create a proportion out of this same formula. Although, you are not expected to derive this second formula on your exam the details are provided below. × = ⟹ = Now cross multiply. × 1 = ⟹ (1) = ( ) ⟹ = 1 Then divide each side by . = ⟹ = Next divide each side by . = 1 ⟹ 1 × = ⟹ = This allows us to use the same formula as a proportion rather than an algebraic formula.

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