What is stronger Opana or Oxycontin?

Extremely - a single 100mcg/hr Fentanyl patch (good for 48-72 hrs depending on the patient) is equivalent to an overall Oxycodone dosage of 202mg per day, or about 9mg Oxycodone every hour for 24 hours. The average Oxycodone dose is about 10-20mg every 6 hours.

Fentanyl is the strongest opiate on the planet at 100x stronger than oral morphine. While it is normally used as an anesthetic, it's used in transdermal patches as a timed-release pain med for severe pain patients.