A nurse is preparing to administer fluphenazine 7.5 mg PO daily to a client who has schizophrenia. Available is fluphenazine elixir 2.5 mg/5 mL. How many mL should the nurse administer?

Step 1 is: Determine the desired dose: 7.5 mg. Step 2 is: Determine the concentration on hand: 2.5 mg ÷ 5 mL. Step 3 is: Set up the calculation: (7.5 mg × 5 mL) ÷ 2.5 mg. Step 4 is: Perform the multiplication: 37.5 mg·mL ÷ 2.5 mg. Step 5 is: Perform the division: 15 mL. Final answer: The nurse should administer 15 mL.