Med Math: Drop Factors Question #1


Mezlocillin 3 g IVPB in 150 mL normal saline (NS) over 1 hour. Drop factor is 10 gtt/mL. _____


  1. 25 gtt/min
    • Rationale:
  2. 33 gtt/min
    • Rationale:
  3. 50 gtt/min
    • Rationale:
  4. 44 gtt/min
    • Rationale:



Mezlocillin is ordered in 3g. This is extra information and not needed to solve the problem. You would need to know how much volume you needed in order to solve. The volume is 150 ml over 1 hour. The hour is converted to minutes. There is a simple formula below for calculating the drop factor. The final answer should have gtt/min within.


—– x gtt


150 mL/60 min x 10 gtt factor/1 = 25 gtt/min

Learning Outcomes

Test Taking Tip

Video Rationale