Fentanyl, have you ever taken this drug? What does the buzz feel like? Can Fentanyl be prescribed legally, or is this just a street drug?

I have no intentions of using this drug. I am only curious as I hear so much about it. I have read of many people dying of this drug, and that just a small amount can kill you. How would one know how much to take, or not to take? The only buzz I know is from Marijuana, how does it differ from that feeling?
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