For a dosage of 60 mg of phenytoin, if the nurse has the solution with 25 mg/5 mL, how many mL is required?

To determine how many mL of the phenytoin solution is required for a dosage of 60 mg, it's important to use the concentration of the solution provided, which is 25 mg per 5 mL.

First, we can find the concentration in mg per mL:

• 25 mg / 5 mL = 5 mg/mL

Next, to find out how many mL are needed for a dose of 60 mg, we set up a proportion based on the concentration:

• If 5 mg is in 1 mL, then to find how many mL contain 60 mg, you can use the equation:

Volume (mL) = Desired Dose (mg) / Concentration (mg/mL)

Substituting the values:

• Volume (mL) = 60 mg / 5 mg/mL = 12 mL

Thus, to administer a dosage of 60 mg of phenytoin from a solution of 25 mg/5 mL, the nurse would need to give 12 mL of the solution. This makes 12 mL the correct answer for this dosage calculation.