A healthcare provider prescribes oral amoxicillin 500\text{ mg} every 8 hours for a client… — NCLEX-RN

A healthcare provider prescribes oral amoxicillin $500\text{ mg}$ every $8$ hours for a client with a respiratory tract infection. The pharmacy dispenses an amoxicillin oral suspension labeled $250\text{ mg}/5\text{ mL}$ . How many milliliters (mL) should the nurse administer for a single dose? (Record answer as a whole number.)

Answer: 10 mL

Answer

Using the standard dosage calculation formula

\frac{\text{Desired}}{\text{Have}} \times \text{Volume}

, the correct setup is

\frac{500\text{ mg}}{250\text{ mg}} \times 5\text{ mL}

. Dividing

500

250

results in

2

. Multiplying

2

by the supplied volume of

5\text{ mL}

gives a final administrable dose of

10\text{ mL}

Step-by-Step Solution

Identify the known variables from the provider's prescription and the available medication supply.

Desired dose =

500\text{ mg}

, Available dose (Have) =

250\text{ mg}

, Volume =

5\text{ mL}

Accurate identification of given numerical values is necessary before setting up the dosage calculation equation.

Set up the dosage calculation using the appropriate formula.

\frac{500\text{ mg}}{250\text{ mg}} \times 5\text{ mL}

The standard formula for liquid medication calculation is

\frac{\text{Desired}}{\text{Have}} \times \text{Volume}

Perform the mathematical calculation to find the final administration volume.

2 \times 5\text{ mL} = 10\text{ mL}

Executing the calculation yields the exact volume of oral suspension the nurse needs to pour or draw up for one dose.

Key Concept

Liquid medication dosage calculation using the desired over have method.

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