The Health Care Provider Has Prescribed the Following Collaborative Interventions

The health care provider has prescribed the following collaborative interventions for a client who is taking azathioprine for systemic lupus erythematosus. Which of the following orders should the nurse question?

A) Draw anti-DNA blood titre.
B) Administer varicella vaccine.
C) Use naproxen 200 mg BID.
D) Take famotidine 20 mg daily.