The nurse is preparing a client with type 2 diabetes for a CT with contrast to evaluate diverticulitis with a possible mass. Which of the following medications on the client’s medication list would be of concern to the nurse?

  • fish oil
  • warfarin (Coumadin)
  • fluoxetine (Prozac)
  • metformin (Glucophage)
Number 4 is correct.
Metformin must be discontinued at least 24 hours before studies with contrast media because of the risk of lactic acidosis, which can be life-threatening. Hold metformin for at least 48 hours post-procedure and do not resume therapy until kidney function has been evaluated. Fish oil is a supplement and does not pose a risk for clients undergoing CT with contrast. Coumadin is an anticoagulant and does not pose a risk with contrast. Prozac is an antidepressant and does not pose a risk with contrast.