A nurse is preparing to administer phenytoin 300 mg PO every 12 hr to a client who has a seizure disorder

A nurse is preparing to administer phenytoin 300 mg PO every 12 hr to a client who has a seizure disorder. Available is phenytoin oral suspension 125 mg/5 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

To calculate how many milliliters (mL) of phenytoin oral suspension to administer per dose, use the following steps:

1. Determine the amount of medication needed per dose:
   • The prescribed dose is 300 mg.
2. Determine the concentration of the available suspension:
   • The available suspension is 125 mg/5 mL.
3. Set up a proportion to find the volume needed:Volume=Desired Dose×Volume of SuspensionConcentration of Suspension\text{Volume} = \frac{\text{Desired Dose} \times \text{Volume of Suspension}}{\text{Concentration of Suspension}}Volume=Concentration of SuspensionDesired Dose×Volume of Suspension​ Volume=300 mg×5 mL125 mg\text{Volume} = \frac{300 \text{ mg} \times 5 \text{ mL}}{125 \text{ mg}}Volume=125 mg300 mg×5 mL​
4. Calculate the volume:Volume=1500125=12 mL\text{Volume} = \frac{1500}{125} = 12 \text{ mL}Volume=1251500​=12 mL

So, the nurse should administer 12 mL of phenytoin oral suspension per dose.

Answer: 12 mL