“Gray Death” Heroin: One Of The Most Dangerous Street Opioids

At the peak of the opioid crisis in 2022, more than 300 people died from an opioid overdose every day in the United States. Opioid overdose deaths declined to approximately 80,000 in 2024, which was a 27 percent drop and the largest single-year decline ever recorded. However, the illicit opioid supply remains extraordinarily dangerous, with illicitly manufactured fentanyl and its analogs responsible for the vast majority of deaths.

Sometimes, the overdoses are caused by prescription pain medications illicitly combined with other substances. One of the main reasons overdoses occur from these illicit drugs is that the drug dealers who manufacture them often combine a wide variety of ingredients in them, which makes it difficult for an addicted individual to know how much of the substance they can consume without overdosing.

On top of this, because the drugs are illegal, there is no way of monitoring them to ensure their safety. One street opioid that is causing a high number of overdose deaths is called “gray death.”

What Is Gray Death?

Gray death first emerged around 2017, primarily in Southern states and Ohio. While it has not become as universally prevalent as fentanyl, it continues to appear in seizures across the country. Its composition varies by batch and manufacturer, making it unpredictable even compared to other illicit opioids. Law enforcement and public health agencies continue to monitor its presence through drug checking programs and toxicology reports.

The amount and type of ingredients that it contains seem to vary depending on who manufactures the drug. What makes it unique is that it is more potent than any other type of heroin that has ever been made before.

Opioids Used To Make Gray Death

Gray death contains three powerful, highly potent main opioids:

• fentanyl
• U-47700
• heroin

Carfentanil may be substituted for fentanyl or combined with it. Since carfentanil is an elephant tranquilizer that is roughly 10,000 times stronger than morphine, it already has the potential to kill a person when used alone.

Fentanyl is 100 times stronger than morphine, so it, too, is considered dangerous. Doctors still prescribe it to patients who are experiencing severe pain from chronic conditions, such as cancer.

U-47700, known as “pink,” was emergency scheduled as a Schedule I substance by the DEA in 2016 and permanently scheduled in 2018. While it was a significant component of early gray death formulations, the composition of gray death has continued to evolve. Newer synthetic opioid analogs, including nitazenes, a powerful class of synthetic opioids emerging in the U.S. supply, sometimes appear in similar mixtures.

How Gray Death Is Manufactured

Doctor-prescribed opioid medications are derived from the poppy plant, which is an orange flower that commonly grows in large clusters in the wild. In order to use the plants for medications, the seeds from the flowers have to be harvested.

The amount of seeds that happen to be available can cause limitations on the amount of opioid-based medications that can be produced. Because of this, researchers developed synthetic opioids that are made from the chemical precursors of the plant.

Illegal drug manufacturers use a process similar to this to make their own synthetic opioids. Sometimes, they also steal or buy them from people who have legal prescriptions for the medications.

Forms Of Abuse

Gray death is used in several different ways. The delivery method often depends on how long a person has had an addiction to opioids. For example, someone who is just starting out may ingest the drug orally or inhale it. As their addiction progresses, they will start to smoke it. In the later stages of their disease, injecting it into the veins becomes more common.

What Does Gray Death Look Like?

Gray death looks like a chunk of concrete when it is in a solid form. In fact, it can easily be mistaken for cement when it is on the ground or in some other inconspicuous place. That is mainly because of its gray color and ashy exterior. If it is powdered, it will look like fine dust that is left over in a bag or other container.

Side Effects Of Gray Death

Because gray death is a combination of at least three powerful opioids, side effects are potent and take effect immediately, sometimes even from touching the drug.

The side effects of gray death can include:

• clammy skin that feels cold to the touch
• dilated pupils
• heart failure
• lethargy
• loss of consciousness
• low blood pressure
• nausea
• trouble breathing
• vomiting

Effects On The Brain And Body

Like all illicit opioids, gray death severely suppresses the central nervous system, which is responsible for important body functions, like heart rate, blood pressure, and respiration.

Those who use it can experience weakness, lethargy, low blood pressure, and trouble breathing. It also impairs the brain’s ability to send and receive signals. This can result in confusion, disorientation, trouble making decisions, and memory problems.

Dangers Of Gray Death Abuse

Gray death is dangerous because it is sold so cheaply. For less than 10 dollars, an addicted person can purchase a sizable quantity of it that is more potent than other, more expensive drugs that require larger amounts for them to experience an intense high. Many people don’t realize this when they first try gray death, however, and may accidentally take a high dose that ends up killing them.

Respiratory Distress

Respiratory distress occurs almost instantly when a person takes a high dose of this drug. In a matter of seconds, their lips will turn blue from a lack of oxygen in their blood.

Then, they will gasp for air because their lungs stop expanding and contracting as they should. Loss of consciousness from complete respiratory failure usually happens in less than a minute if naloxone (Narcan) isn’t administered at this point.

Fatal Overdose

A person can overdose on a tiny amount of gray death within seconds of being exposed to it.

An overdose on gray death can occur from:

• accidentally inhaling the dust from the drug into the lungs
• intentionally injecting or consuming it

Most overdoses on gray death happen accidentally in people who were not aware of its potency.

Gray Death Supply Chain

The fentanyl supply chain has shifted significantly. While Chinese chemical suppliers were early sources of fentanyl precursors, U.S. and international enforcement pressure has redirected much of the supply.

Today, Mexican cartels, particularly the Sinaloa and CJNG cartels, are the primary manufacturers and distributors of illicitly manufactured fentanyl and fentanyl analogs entering the United States. They often use chemical precursors sourced from China and India.

This is dangerous because they often change the formula they use to manufacture the substance so they can avoid detection from law enforcement officials who check luggage and boxes brought in from foreign nations.

It is impossible to predict what substances gray death will contain and how potent it will be. Other forms of heroin may be contaminated by this drug as it is being transported. All individuals with opioid use disorder need to be aware of the risks they are taking when they use this or any form of heroin.

Who Is At Risk?

Because of its potency, anyone who uses heroin and other illicit opioids is at risk for an overdose or other health complications from gray death, even if they have already built up a high tolerance.

You can never guarantee where a batch of heroin came from, what is in it, or how potent it may be; in other words, everyone who uses heroin risks it containing potent chemicals that could lead to overdose or other consequences.

Law enforcement officials have to be especially careful because they routinely check vehicles, bags, and homes where gray death might be. This can put them at risk of accidentally overdosing on it if they don’t have several vials of Narcan with them to reverse its effects.

Treatment Options For Opioid Addiction

Anyone struggling with opioid use disorder, particularly those using fentanyl-containing substances like gray death, should seek treatment immediately. Medication-assisted treatment with buprenorphine (Suboxone) or methadone is the gold standard of care and significantly reduces the risk of fatal overdose. These medications can be started even while a person is still using, and buprenorphine can now be prescribed via telehealth without requiring an in-person visit.

Naloxone (Narcan) should be in the hands of every person who uses opioids and their family members. It is available without a prescription at most pharmacies. Given the potency of gray death, multiple doses may be required.

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Written by the Addiction Resource Editorial Staff