Has anyone ever given this much oxy?

A little context: this was an oncology patient on a med/surg floor. The patient was also receiving 2mg IV Dilaudid q2 and had 7 fentanyl patches. This wasn't end of life care. In my 12 hour shift I gave her 840mg of oxy. In my 10 years of nursing I've never seen this, and neither had any of the physicians/pharmacists in the hospital. She tolerated it no problem and called right on the dot when it was time for more. How can someones body tolerate this many opioids?

A little context: this was an oncology patient on a med/surg floor. The patient was also receiving 2mg IV Dilaudid q2 and had 7 fentanyl patches. This wasn't end of life care. In my 12 hour shift I gave her 840mg of oxy. In my 10 years of nursing I've never seen this, and neither had any of the physicians/pharmacists in the hospital. She tolerated it no problem and called right on the dot when it was time for more. How can someones body tolerate this many opioids?