What are Nitazenes? Understanding Synthetic Opioids
Synthetic opioids are powerful substances that have been showing up more and more in the illicit drug supply. According to the DEA, nitazenes were discovered in the drug supply chain between 1999 to 2004 before remerging again in 2019 and making headlines today. What are nitazenes? Nitazenes are a classification of extremely dangerous synthetic opioids that are highly potent with no approved medical use.
Nitazenes have been showing up in the illegal drug supply, often without the person knowing it is there. Its potency is about 500 times stronger than morphine and even fentanyl. There is no known safe dose. The smallest amount can raise the risk of overdose.
Since its reemergence in 2019, nitazenes have been identified in at least 4,300 law enforcement drug seizures. Users don’t seek out drugs that contain nitazenes. They accidentally consume them when it is mixed with other drugs such as MDMA, heroin, cocaine, benzos, ketamine and fentanyl. This highly potent drug’s return to the market has many sounding the alarm for increased overdose deaths.
What are Nitazenes?
Nitazenes are fully synthetic opioids created in a lab that act on the body’s opioid receptors. They are generally described as benzimidazole opioids, a chemical originally explored decades ago for pharmaceutical research but never approved for medical use in the US. Today, the concern is the appearance of these drugs in the unregulated drug supply mixed in with popular street drugs like fentanyl, heroin and counterfeit pills.
Nitazenes are extremely potent and can produce the same broad effects as drugs like fentanyl, but their strength can be unpredictable. They have a smaller therapeutic window compared to other opioids. This means even in very small amounts, the difference between therapeutic effects and oversedation and respiratory depression is very little.
Nitazenes were first created back in the 1950s by a Swiss company working to develop an alternative to morphine. It was never brought to market due to its high risks. Some of these drugs include metonitazene, etonitazene, butonitazene, isotonitazene and clonitazene. This category of synthetic opioids was later shortened to the term “nitazenes.”
Today, they have been primarily found in powder form in an off-white, yellow or light brown color. You would not be able to tell if a product contains nitazenes just by looking at it. Nitazenes have been identified in recent overdose deaths but are still rare in the US. Fortunately, Nitazenes are not currently the dominant drug in any market.
Why are Nitazenes getting more attention?
Nitazenes are not a new chemical. In fact, they are an older class of opioids. But their presence in the illicit drug supply chain is new and a growing problem. The DEA first reported an emergence of nitazenes in the recreational drug market in 2019 and has continued to identify additional compounds in recent years.
The biggest issue with the drug is that many people are unaware they are taking them. They are often mixed into fentanyl powder, heroin or pressed pills. They produce similar effects to fentanyl such as euphoria, pain relief and respiratory depression. There is almost no way to tell if a substance contains nitazenes.
They can be quickly manufactured and are relatively cheap to produce. This makes it an attractive additive to illicit drug producers. This is important because opioid overdose risk rises when the potency of a drug is unknown. A person can take the amount they usually take, but if the supply contains a stronger opioid, they may not be able to tolerate it.
Effects of Nitazenes on the body
These synthetic opioids produce effects that are generally similar to traditional opioids like morphine and heroin. Reported effects include pain relief, relaxation, euphoria, drowsiness, dizziness, nausea, vomiting, confusion, pinpoint pupils and respiratory depression.
The effects of nitazenes can vary depending on the specific compound, dose, route of administration, tolerance and whether or not other substances were involved. Some people with opioid tolerance still face risks because of the unknown potency of nitazenes that could be hiding in street drugs.
Common opioid symptoms that can lead to overdose
- Sedation and extreme sleepiness
- Slowed breathing or respiratory depression
- Nausea and vomiting
- Confusion and disorientation
- Pinpoint pupils
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Why is there such a high risk for Overdose?
Potency is the main problem when it comes to nitazenes. Unknown potency can make the drugs unpredictable. When the drug supply is unregulated, there is no reliable label, no quality control and no guarantee that two pills or powder samples contain the same substance or the same amount of substance.
Risk factors to understand:
- Unknown contents – A person may think they are using fentanyl, heroin or oxycodone, but the product also contains nitazene.
- Uneven mixing – Potent opioids can be distributed unevenly, which means one pill or portion can be much stronger than the other.
- Reduced tolerance – The risk can rise after a break from opioid use, especially after detox, hospitalization or any period of reduced use.
- Using alone – Using opioids alone can be risky because there will be no one to call emergency services or administer naloxone.
- Mixing depressants – Alcohol, benzos and sleep medications can increase the chances of dangerous breathing problems.
Harm Reduction and How to prevent a dangerous situation
The safest way to avoid nitazene exposure is to not use illicit counterfeit pills. However, this is not always possible in real-world situations. Harm reduction offers practical tools without judgment. Examples of this can include carrying naloxone, avoiding use alone, drug checking when available and knowing the signs of overdose and what to do when it happens.
There are some policies that can be implemented to help people stay more informed about nitazenes and stay away from them. These include:
- Investing in addiction treatment services
- Expanding access to addiction medication
- Address the demand and root causes of drug use
- Increase access to interventions like naloxone and sterile needle supplies to help reduce overdose death
- Authorize overdose prevention facilities
- Ensure the public has access to basic needs like housing and food
- Prioritize a health approach to drugs
- Improve drug checking data collection
- Expand on research and services for polysubstance abuse
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Nitazenes are what is sometimes referred to as “frankenstein opioids” that reemerged on the street drug market in 2019 and now have the DEA sending out warnings for this highly potent substance. It is often consumed unknowingly in unknown amounts through illicit street drugs.
Hotel California by the Sea provides treatment for opioid use disorders. We offer treatment at all levels of care including detox, residential, PHP and IOP. We utilize evidence-based methods such as CBT, DBT and EMDR therapy. Hotel California by the Sea is dedicated to helping our clients reach their goals in sobriety and overcome their addiction.
References:
https://pmc.ncbi.nlm.nih.gov/articles/PMC12331301
https://drugpolicy.org/wp-content/uploads/2026/04/DPA-NitazenesFactSheet_InDesign.pdf
https://crh.arizona.edu/sites/default/files/2026-02/260223_Nitazine_ADHS-Revised.pdf
