Pharmacology 3rd Edition by Michael Adams, Carol Urban

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Rita Manson presents to the emergency department with vomiting, severe abdominal and back pain, and jaundice. Her jaundice is recent but the pain and vomiting have continued for a couple of months. Her diagnostic work-up reveals advanced pancreatic cancer with metastasis to the spine.
What is the drug of choice for Rita's pain management? Which route of administration would be expected initially?