A vial of phenytoin sodium (Dilantin) contains 100 mg of drug in a total of 2 mL. How many milligrams of phenytoin sodium is contained in 0.5 mL of solution?
a. 2.5 mL c. 25 mg
b. 1.0 mg d. 50 mg
ANS: C
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A Incorrect: This would yield 125 mg.
B Incorrect: This would be in 1/50 mL.
C Correct: Set up as a fractional dosage problem with 100 mg over 2 mL equals X over 0.5 mL = 25 mg.
D Incorrect: This would be in 1 mL.
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