It is 10,000 timesmore potent than morphine and 100 times more potent than fentanyl.
The drug is also used totranquilize elephants and other large mammals.
This drug is so powerful it poses a significant threat to first responders and law enforcement personnel who touch it by accident. In addition, people can overdose on carfentanil quickly. Multiple doses of the anti-overdose drug Narcan may not be effective.
Users exposed to carfentanil can experience dizziness, clammy skin, shallow breathing, heart failure and more.