A nurse is preparing to administer fluoxetine 80 mg PO daily. The amount available is fluoxetine 20 mg/5mL. How many mL should the nurse administer? Round off to the nearest whole number. Enter numeric value only (numbers and decimal points only, no commas or labels)

1. Identify the information given: Prescribed dose: 80 mg of fluoxetine Available concentration: 20 mg/5 mL 2. Determine the volume to be administered: Set up a proportion to solve for the unknown volume (X): 20 mg/5 mL = 80 mg/X mL Cross-multiplying gives us: 20 mg x X mL = 80 mg x 5 mL Simplifying: 20X = 400 Solving for X: X = 400 / 20 = 20 mL