A 63-Year-Old Man Comes to the Office for Routine Follow-Up

A 63-year-old man comes to the office for routine follow-up a month after being prescribed morphine for chronic, treatment-resistant back pain.  The patient says that his pain is greatly reduced since starting the morphine.  He has been able to begin a light exercise regimen for the first time in over 2 years.  His other medical conditions include hypertension, type 2 diabetes mellitus, allergic rhinitis, and major depressive disorder.  Temperature is 36.1 C (97 F) , blood pressure is 118/84 mm Hg, pulse is 62/min, and respirations are 12/min.  The patient has normal range of motion of the spine, and movement is associated with a reduction in pain compared with previous examinations.  As part of prescription drug misuse monitoring, the physician performs a random urine drug screen that is positive for opioids and phencyclidine (PCP) .  The patient insists that he is not taking PCP.  Which of the following medications could be causing a false-positive result on his urine drug screen?

A) Atenolol
B) Bupropion
C) Dextromethorphan
D) Phenylephrine
E) Propranolol

Correct Answer:

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