A 69-year-old man comes to the physician for a 2-week history of pain radiating down his right leg. Treatment with oxycodone-acetaminophen tablets have not relieved the pain. He has long-standing type II diabetes mellitus managed with insulin. There has been no recent trauma. Physical examination shows hyperesthesia to touch over the right leg. Muscle strength and sensation are intact. Which of the following is the most appropriate next step in management?
Increase dose of oxycodone-acetaminophen tablets
Discontinue oxycodone-acetaminophen and add fentanyl
Add loperamide
Add meperidine
Add naproxen
Add nortriptyline at bedtime
