Heroin is an illegal opioid made from morphine — a natural substance extracted from opium poppy plants. It reaches the brain faster than morphine and binds to opioid receptors with an intensity that drives rapid physical dependence. The cycle of euphoria, tolerance, and withdrawal it creates makes it extremely difficult to stop without professional support.
Today’s supply has made this even more dangerous. Widespread fentanyl contamination means that every use carries unpredictable overdose risk — even for people with an established tolerance. If you or someone you love is struggling with heroin, understanding what you’re dealing with is the first step toward getting out.
In 2023, nearly 4,000 overdose deaths in the United States involved heroin, according to the CDC. That number reflects a significant decline from its 2016 peak — but a new danger has emerged: most of those deaths also involved illicitly manufactured fentanyl, which has contaminated the heroin supply and made every use potentially fatal.
This article covers what heroin is, how it affects the body and brain, the signs of heroin use disorder, what withdrawal looks like, and what evidence-based treatment options are available.
What Is Heroin, and How Is It Made?
Heroin is a semi-synthetic opioid — it is derived from morphine, which comes from the opium poppy plant, and then chemically processed to increase its potency and speed of action. It enters the brain more quickly than morphine, which is a primary reason it is so highly addictive.
The DEA classifies heroin as a Schedule I controlled substance — meaning it has no accepted medical use in the United States and a high potential for abuse and dependence.
What Does Heroin Look Like?
Heroin appears in several forms depending on how it was produced and what it was mixed with:
- White powder — usually higher purity; more commonly smoked or snorted
- Brown powder — lower purity; often contains additives like powdered milk, starch, or sugar
- Black tar heroin — a dark, sticky substance common in the western United States; typically injected
Street dealers often “cut” heroin with other substances to increase volume and profit. Today, fentanyl is commonly used as a cutting agent — a synthetic opioid that is 50–100 times more potent than morphine — which dramatically increases overdose risk.
Street Names for Heroin
Heroin is sold under many street names, including: smack, horse, H, big H, hell dust, junk, dope, black tar, and China white. Knowing these terms can help parents, partners, and family members recognize when heroin is being discussed.
How Does Heroin Affect the Brain and Body?
When heroin enters the bloodstream — by injection, smoking, or snorting — it crosses the blood-brain barrier and is rapidly converted to morphine. According to NIDA, it then binds to opioid receptors in the brain’s reward center, producing an intense surge of euphoria known as a “rush.”
The speed and intensity of this rush depends on how the drug is taken. Injection produces effects within seconds; smoking within minutes; snorting within 10–15 minutes.
Short-Term Effects of Heroin
The initial rush is typically followed by several hours of drowsiness. Short-term effects include:
- Intense feelings of pleasure and warmth (“the rush”)
- Dry mouth and heavy feeling in the arms and legs
- Flushed, warm skin
- Nausea and vomiting
- Severe itching
- Slowed heart rate and breathing, including alternating between wakefulness and semi-consciousness (known as “going on the nod”)
Slowed breathing is one of the most dangerous immediate effects. NIDA notes that in severe cases, respiratory depression can cause coma, permanent brain damage, or death.
Long-Term Effects of Heroin Use
With repeated use, heroin causes lasting physical changes to the brain and body:
- Tolerance — the brain requires larger and more frequent doses to feel the same effect
- Physical dependence — the body begins to need heroin to function normally
- Deterioration of white matter in the brain, affecting decision-making and behavior regulation
- Collapsed veins (from injection)
- Increased risk of HIV, hepatitis B, and hepatitis C from shared needles
- Liver and kidney damage
- Bacterial infections of the heart valves
- Chronic constipation and gastrointestinal issues
- Weakened immune system
Is Heroin Still Common? The Fentanyl Connection
The heroin supply has changed dramatically since 2016. Heroin overdose deaths peaked at over 15,000 in 2016 and have declined significantly since — but not because the drug is less dangerous.
CDC data from 2023 shows that approximately 80% of heroin-involved overdose deaths also involved illicitly manufactured fentanyl (IMF). This means the majority of people who died from heroin were unknowingly using a supply contaminated with a far more potent substance.
This contamination problem has fundamentally changed the risk profile of heroin. A person cannot tell by looking at heroin whether it contains fentanyl. A single dose from a contaminated batch can be lethal, even for someone with an established tolerance.
What Are the Signs of Heroin Use Disorder?
Heroin use disorder — the clinical term for heroin addiction — is a chronic medical condition, not a moral failing or a choice. According to the CDC, opioid use disorder is characterized by a problematic pattern of opioid use that causes significant impairment or distress.
Common signs that someone may have developed heroin use disorder include:
Behavioral signs:
- Spending increasing amounts of time obtaining, using, or recovering from heroin
- Withdrawing from friends, family, and activities once enjoyed
- Neglecting responsibilities at work, school, or home
- Continuing to use despite serious health, legal, or relationship consequences
- Inability to control or stop use despite repeated attempts
Physical signs:
- Track marks or bruising on arms from injection
- Wearing long sleeves in warm weather to cover injection sites
- Pinpoint (constricted) pupils
- Sudden weight loss
- Runny nose, frequent sniffling (from snorting)
- Nodding off at unusual times
Psychological signs:
- Intense cravings for heroin
- Mood swings and irritability when not using
- Anxiety or depression between uses
- Paranoia or confusion
If these signs are present, professional assessment and treatment can help. Recovery is possible, and effective treatment is available.
What Does Heroin Withdrawal Feel Like?
Heroin withdrawal is intensely uncomfortable and a primary reason people struggle to stop using on their own. Withdrawal begins because the brain has adapted to the presence of heroin and cannot regulate itself normally without it.
Heroin Withdrawal Timeline
Phase | Onset | Symptoms |
Early withdrawal | 6–12 hours after last use | Anxiety, agitation, muscle aches, runny nose, sweating, insomnia, drug cravings |
Peak withdrawal | 48–72 hours | Nausea, vomiting, diarrhea, abdominal cramps, goosebumps, rapid heart rate, elevated blood pressure |
Subsiding symptoms | Days 4–7 | Physical symptoms gradually ease; psychological symptoms (depression, cravings) may persist |
Post-acute withdrawal | Weeks to months | Mood instability, sleep disruption, and cravings can linger well beyond physical withdrawal |
Source: MedlinePlus / U.S. National Library of Medicine
While heroin withdrawal is rarely life-threatening in healthy adults, it is highly distressing — and the risk of relapse during this period is extremely high. Medical detox at a supervised facility significantly increases safety and the likelihood of completing the withdrawal process.
How Do You Recognize a Heroin Overdose?
A heroin overdose is a medical emergency. Recognizing the signs early can save a life.
Signs of heroin overdose:
- Unresponsive or unconscious
- Slow, shallow, or stopped breathing
- Loud snoring or gurgling sounds (a blocked airway)
- Blue or grayish lips and fingertips (cyanosis)
- Limp body
- Pinpoint pupils
If you suspect an overdose:
- Call 911 immediately
- Administer naloxone (Narcan) if available — it rapidly reverses opioid overdose and is available without a prescription at most pharmacies
- Place the person in the recovery position (on their side) to prevent choking
- Stay with them until emergency services arrive
According to the CDC, naloxone can restore normal breathing within 2–3 minutes. Because fentanyl-contaminated heroin is now common, multiple doses of naloxone may be needed.
What Is the Connection Between Prescription Opioids and Heroin?
Many people who develop heroin use disorder began with prescription opioid pain medications. Research shows that people who misuse prescription opioids are significantly more likely to transition to heroin — often because heroin is cheaper and more accessible on the street.
NIDA research (2014) estimates that roughly 80% of people who use heroin reported misusing prescription opioids first — a pathway that remains a key risk factor for opioid use disorder. Healthcare providers at treatment centers like Discover Recovery frequently work with people who began this journey with medications like oxycodone or hydrocodone before transitioning to heroin.
This is why catching prescription opioid misuse early matters. By the time someone transitions to heroin, the addiction is typically more entrenched — and treatment needs to account for both the opioid use disorder and whatever drove the original misuse.
How Is Heroin Use Disorder Treated?
Heroin use disorder is a chronic medical condition that responds well to treatment. According to NIDA, medication combined with behavioral therapy is the most effective approach for opioid use disorder.
Medication-Assisted Treatment (MAT)
Three FDA-approved medications are used to treat heroin use disorder:
Buprenorphine (Suboxone): A partial opioid agonist that reduces cravings and withdrawal symptoms without producing a significant high. Available as a daily sublingual film or tablet, and in long-acting injectable and implant forms.
Methadone: A full opioid agonist that activates the same receptors as heroin but with a slower onset and longer duration. It eliminates withdrawal symptoms and reduces cravings without causing intoxication when taken as prescribed. Dispensed through certified opioid treatment programs.
Naltrexone (Vivitrol): An opioid antagonist that blocks the effects of opioids entirely. Available as a monthly injectable, making it a strong option for people who want to avoid daily medications.
These medications are not “replacing one addiction with another.” They restore brain chemistry, reduce cravings, and allow people to engage meaningfully in therapy and rebuild their lives.
Behavioral Therapies
MAT works best when combined with behavioral therapies, including:
- Cognitive Behavioral Therapy (CBT) — helps identify and change thought patterns that drive drug use
- Motivational Enhancement Therapy — strengthens a person’s readiness to change
- Contingency Management — uses positive reinforcement to support abstinence
- Family Therapy — addresses relationship dynamics that contribute to or are affected by addiction
Levels of Care
Effective heroin treatment typically involves a structured continuum of care:
- Medical Detox — supervised withdrawal management, 24/7 monitoring, and MAT initiation
- Residential Treatment — intensive, structured inpatient care
- Partial Hospitalization Program (PHP) — structured day treatment with return to housing at night
- Intensive Outpatient Program (IOP) — several sessions per week, allowing for work or family responsibilities
- Sober Living / Aftercare — transitional housing and ongoing support to prevent relapse
Finding Heroin Addiction Treatment in Washington and Oregon
If you or someone you love is struggling with heroin use disorder, specialized treatment is available in the Pacific Northwest.
Discover Recovery offers a full continuum of care at residential treatment centers in Long Beach and Camas, WA, and an outpatient clinic in Portland, OR. Treatment programs include medically supervised detox, medication-assisted treatment, behavioral therapy, and sober living support.
Our admissions team can walk you through what to expect — and help you get started. You can also verify your insurance benefits in just a few minutes.
Call us today: 866.719.2173 Or verify your insurance online — it takes just a few minutes.
If you’re in crisis right now, SAMHSA’s National Helpline is available 24/7: 1-800-662-4357 (free and confidential).
Frequently Asked Questions
Is heroin an opioid?
Yes. Heroin is a semi-synthetic opioid derived from morphine, which is extracted from the opium poppy plant. It belongs to the same drug class as prescription pain medications like oxycodone and hydrocodone, but it is illegal, has no accepted medical use in the United States, and is classified as a Schedule I controlled substance by the DEA.
How addictive is heroin?
Heroin is highly addictive — physical dependence can develop after just a few uses. The drug floods the brain’s reward system with dopamine, creating an intense euphoria that the brain quickly begins to crave. Over time, the brain reorganizes around heroin, making it extremely difficult to stop without medical support.
Can you die from heroin withdrawal?
Heroin withdrawal is rarely fatal in otherwise healthy adults, but it carries serious risks. Severe dehydration from vomiting and diarrhea can become dangerous without medical support. More critically, withdrawal dramatically lowers opioid tolerance — meaning relapse during or immediately after withdrawal raises overdose risk significantly. Medical detox provides 24/7 monitoring and medications to manage both the physical symptoms and the relapse risk.
How does fentanyl contamination change the risk of heroin overdose?
Fentanyl is 50–100 times more potent than morphine, and it can’t be detected by sight, smell, or taste. When heroin is contaminated — which CDC data suggests is now the norm rather than the exception — a single dose can be lethal even for someone with a high tolerance. This is why harm reduction tools like fentanyl test strips and readily available naloxone (Narcan) are critical for anyone in contact with the current heroin supply.
Can heroin use disorder be treated with medication?
Yes. Three FDA-approved medications — buprenorphine, methadone, and naltrexone — are effective treatments for heroin use disorder. According to NIDA, medication combined with behavioral therapy is the most effective approach. These medications reduce cravings and withdrawal symptoms and help people sustain recovery.
What’s the difference between heroin and fentanyl?
Both are opioids, but fentanyl is a fully synthetic drug that is 50–100 times more potent than morphine. Heroin is a semi-synthetic opioid derived from morphine. Today’s illicit heroin supply is frequently contaminated with fentanyl, which dramatically increases overdose risk — even in people with an established heroin tolerance
Reviewed By: Dr. Kevin Fischer, M.D.
Kevin Fischer, MD is an experienced leader in the fields of Internal Medicine and Addiction Medicine. He works with patients suffering from Substance Use Disorder to evaluate their comprehensive health needs and prescribe Medication-Assisted Treatment (MAT). In addition, he mentors aspiring health professionals and leads collaborative care through team-based medical models. He also directs treatment strategies and streamlines clinical protocols for effective substance use recovery.