If the available concentration is 250 mg/mL and you need 500 mg, how many mL will you administer?

To determine how many mL you need to administer to achieve a dose of 500 mg from a concentration of 250 mg/mL, you can use the formula:

[

\text{Volume (mL)} = \frac{\text{Desired Dose (mg)}}{\text{Concentration (mg/mL)}}

]

In this scenario, you would substitute the values:

[

\text{Volume (mL)} = \frac{500 \text{ mg}}{250 \text{ mg/mL}} = 2 \text{ mL}

]

This calculation shows that to administer a total of 500 mg of the medication when it is available at a concentration of 250 mg per mL, you will need to give 2 mL. This is directly derived from understanding the relationship between dosage and concentration, reinforcing critical skills in dosage calculation essential for safe medication administration.