A client requires phenytoin 75 mg PO every 6 hours. If the available formula is 25 mg/5 mL, how many mL will the nurse administer?

To determine how many mL of the phenytoin solution a nurse should administer, we start by calculating the total amount of the medication required. The client needs 75 mg of phenytoin per dose. Given that the formulation available is 25 mg in 5 mL, we can first find out how many mL contains the 75 mg dosage.

Using a proportion, we can set up the calculation:

1. We know that 25 mg corresponds to 5 mL.

2. To find out how many mL correspond to 75 mg, we can set up a ratio:

[

\frac{25 \text{ mg}}{5 \text{ mL}} = \frac{75 \text{ mg}}{X \text{ mL}}

]

3. Cross-multiplying gives us:

[

25X = 75 \times 5

]

[

25X = 375

]

4. Next, divide both sides by 25 to solve for X:

[

X = \frac{375}{25} = 15 \text{ mL}

]

Thus, the calculation