A client is ordered digoxin 0.125 mg by mouth daily. The available preparation is a liquid in a dropper bottle labeled Digoxin Elixir 500 mcg/20 mL. How many milliliters will be administered? (Do not use trailing zero, round to a whole number)

Step 1 is convert the dose ordered from milligrams (mg) to micrograms (mcg) for unit consistency: 0.125 mg× 1000 mcg/ mg = 125 mcg. Step 2 is calculate the milliliters (mL) to administer using the concentration: Desired Dose÷Available Concentration = 125 mcg÷ (500 mcg/20 mL). Step 3 is 125 mcg/500 mcg× 20 mL. Step 4 is 0.25 × 20 mL = 5 mL. Step 5 is Round to a whole number: 5 mL. The final calculated answer is 5 mL.