ok I fixed it, i meant 2-3 mg my previous post, which does equal 2000-3000 mcg. I didn't say they had that much, I just wanted to speculate. I guess it's probably much less than that (since that is a large dose, not necessarily lethal though), but maybe fentanyl is weak orally, so I don't know.
So to clarify, god, I meant that 2-3 mg is 2000-3000 mcg