It is impossible to tell whether a drug contains fentanyl by the taste or smell. “Somebody can believe that they can smell it or taste it, or see it … but that’s not a scientific test,” said Josiah “Jody” Rich, an addiction specialist who teaches at Brown University. “People are going to die today because they buy some cocaine that they don’t know has fentanyl in it.” The first wave of the long-running and devastating opioid epidemic began in the U.S. with the abuse of prescription painkillers in the early 2000s. The second wave involved an increase in heroin use, starting around 2010. The third wave began when powerful synthetic opioids such as fentanyl started appearing in the supply around 2015. Now experts are observing a fourth phase of the deadly epidemic, KFF Health News reports. The mix of stimulants such as cocaine and methamphetamines with fentanyl — a synthetic opioid 50 times as powerful as heroin — is driving what experts call the opioid epidemic’s “fourth wave.” The mixture of stimulants and fentanyl presents powerful challenges to efforts to reduce overdoses because many users don’t know they are at risk of ingesting opioids, so they don’t take overdose precautions.
The only way to know whether cocaine or other stimulants contain fentanyl is to use drug-checking tools such as fentanyl test strips — a best practice for “harm reduction,” now embraced by federal health officials in combating drug overdose deaths. Fentanyl test strips cost as little as $2 for a two-pack online, but many front-line organizations also give them out free. Nationwide, illicit stimulants mixed with fentanyl were the most common drugs found in fentanyl-related overdoses, according to a study published in 2023 in the scientific journal Addiction. The stimulant in the fatal mixture tends to be cocaine in the Northeast, and methamphetamine in the West and much of the Midwest and South. “The No. 1 thing that people in the U.S. are dying from in terms of drug overdoses is the combination of fentanyl and a stimulant,’’ said Joseph Friedman, a researcher at UCLA and the study’s lead author. “Black and African Americans are disproportionately affected by this crisis to a large magnitude, especially in the Northeast.” Studies of street drugs, he said, show that in illicit drugs the potency can vary from 1 percent to 70 percent fentanyl. “Imagine ordering a mixed drink in a bar and it contains one to 70 shots,” Friedman said, “and the only way you know is to start drinking it. … There would be a huge number of alcohol overdose deaths.”