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You must be thinking of something else. Pure fentanyl has a lethal dosage in the microgram range.



Both things can be true, and are in the case of fentanyl. The lethal dose is small in absolute terms, perhaps as low as 2mg[0]. The therapeutic window is large in that doses around 50mcg[1] are useful for pain relief in adult patients. That's 1/40 the potentially lethal dose.

[0] https://www.dea.gov/resources/facts-about-fentanyl

[1] https://www.drugs.com/dosage/fentanyl.html




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