Members of the Royal Canadian Mounted Police go through a decontamination procedure after intercepting a package containing around 1 kilogram (2.2 pounds) of the powerful opioid carfentanil, imported from China to Vancouver. China has now added the drug to its list of controlled substances. AP hide caption

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AP

First responders have found that standard doses of naloxone aren't always enough to counteract the powerful sedating effects of carfentanil. Ted Horowitz/Getty Images hide caption

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Ted Horowitz/Getty Images

An Even Deadlier Opioid, Carfentanil, Is Hitting The Streets

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These pills were made to look like Oxycodone, but they're actually an illicit form of the potent painkiller fentanyl. A surge in police seizures of illicit fentanyl parallels a rise in overdose deaths. Tommy Farmer/Tennessee Bureau of Investigation/AP hide caption

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Tommy Farmer/Tennessee Bureau of Investigation/AP

Heroin sold in the U.S., like this dose confiscated in Alabama last fall, is often cut with other drugs. Tamika Moore/AL.com/Landov hide caption

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Tamika Moore/AL.com/Landov

Illicit Version Of Painkiller Fentanyl Makes Heroin Deadlier

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