Questions: A nurse is preparing to administer phenytoin 200 mg PO to a client. Available is phenytoin oral suspension 125 mg / 5 mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Determine the volume of phenytoin oral suspension to administer.

Identify the given information.

• Desired dose: \(200 \, \text{mg}\)
• Available concentration: \(125 \, \text{mg} / 5 \, \text{mL}\)

Set up the proportion to find the required volume.

\[ \frac{125 \, \text{mg}}{5 \, \text{mL}} = \frac{200 \, \text{mg}}{x \, \text{mL}} \]

Solve for \(x\).

\[ 125x = 200 \times 5 \] \[ 125x = 1000 \] \[ x = \frac{1000}{125} \] \[ x = 8 \, \text{mL} \]

Round the answer to the nearest whole number.

The calculated volume is already a whole number: \(8 \, \text{mL}\).

\[ \boxed{8 \, \text{mL}} \]

\[ \boxed{8 \, \text{mL}} \]