What Are Nitazenes?
Nitazenes (NYE-tah-zeens) are a class of synthetic — meaning lab-made — opioids. They were developed in the 1950s but were never approved or used as medicine. In recent years, they have started appearing in the illicit drug supply, most often mixed in with fentanyl rather than sold on their own.
Because nitazenes are so powerful, even a tiny amount mixed into another drug can cause a life-threatening overdose. Most people who are exposed have no idea — there is no way to tell by looking at a pill, powder, or liquid.
Nitazenes are appearing as an additional adulterant in an already dangerous fentanyl supply. They are not typically sold on their own. Because standard drug tests do not detect them, their presence in the supply is largely hidden — exposure often goes unrecognized unless a specialized laboratory test is ordered.
Why This Matters for You
There are two things about nitazenes that are critical to understand if you are in treatment or recovery:
Your standard drug test will not detect nitazenes. Standard urine drug tests used by treatment programs, drug courts, and probation offices cannot detect nitazenes — including opiate panels and fentanyl panels. A negative drug test does not mean nitazenes were not present.
Naloxone (Narcan) works on nitazenes. Unlike some other adulterants, naloxone can reverse a nitazene overdose because nitazenes are full opioids — they act on the same part of the brain that naloxone blocks. However, because nitazenes are very powerful, one dose of Narcan may not be enough. Be prepared to give multiple doses.
Signs of Overdose
Nitazene overdose looks the same as any opioid overdose. Because nitazenes are so powerful, overdose can happen quickly — even in someone with a high opioid tolerance:
Nitazenes bind tightly to opioid receptors and their effects can last longer than a single dose of Narcan. If the person does not respond after one dose, give another dose every 2 to 3 minutes and call 911. The Narcan is likely helping — it may just need to be repeated. Do not wait and do not leave the person alone.
If Someone Is Unresponsive — What to Do
If someone is unresponsive and you think drugs may be involved, act right away. Do not wait to see if they "sleep it off."
What This Means for Your Drug Test
Standard urine drug tests — including opiate panels, fentanyl panels, and most multi-substance point-of-care test strips — do not detect nitazenes. A negative result on a standard drug test does not mean nitazenes were absent.
Identifying nitazenes requires specialized laboratory testing. This type of testing is not routinely available at most clinic sites. If you believe you may have been exposed, talk to your care team.
Specialized test strips for checking substances for nitazenes are available for harm reduction programs and are used at some treatment sites. These are not urine drug tests — they are used to test a pill, powder, or liquid before it is taken. They are for harm reduction use only and are not cleared by the FDA for clinical decisions. Ask your treatment program or harm reduction organization if nitazene test strips are available to you.
What to Tell Your Treatment Team
Your counselor, doctor, or nurse needs to know about nitazenes. Here are things worth sharing: