Method Fentanyl Powder? (Australia)

[another_creature]

I have been looking at many methods, at the moment I am (sadly) stuck in Australia. For many reasons I would ideally not want to CTB here, but as circumstance has it, I might. And as such.. I have considered fentanyl which many people die from by accidental OD. I had quite some trouble finding reliable sources, but regardless, assuming what I can source is pure, would 1 mg of pure powdered fentanyl be enough for CTB? (I am approx 165 cm 55 kg)

Regardless, I am willing to travel to other areas as long as peaceful CTB is an option.