Fentanyl is tasteless and odorless. It’s sold illegally in both powder and liquid form. The powder (which looks similar to cocaine or even powdered aspirin) can also be pressed into pill form. Liquid forms can be found in nasal spray bottles, eye droppers, dropped onto paper, or contained in small candy or sugar cubes (similar to LSD).
I don’t know about the specific levels, but it’s extremely potent and can be lethal in very small amounts. According to the DEA, the powder seen in the picture below is a lethal amount.
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Fentanyl is a potent synthetic opioid drug approved by the Food and Drug Administration for use as an analgesic (pain relief) and anesthetic. It is approximately 100 times more potent than morphine and 50 times more potent than heroin as an analgesic.
www.dea.gov