Heroin (Diacetylmorphine): Dependence, Withdrawal, and Recovery Support

Heroin is the drug most people picture when they hear the word addiction, and the picture is out of date. The DEA calls it "a highly addictive drug" and "a rapidly acting opioid" (DEA fact sheet), but the bag sold as heroin today usually holds something else. The DEA's 2025 threat assessment reports that "The mixing of fentanyl and heroin is so commonplace that both heroin users and forensic drug-testing laboratories say it is difficult to find heroin unadulterated with fentanyl" (DEA, 2025). Heroin is hard to stop because it acts within seconds and wears off within hours, and dangerous to stop badly because tolerance disappears faster than the habit does. This page covers what heroin is now, how withdrawal and medication treatment work, how testing catches it, and how weekly support at home fits once a prescriber is involved.

What heroin is and how it works

Heroin (diacetylmorphine) is "an opiate (narcotic) drug processed from morphine and extracted from certain poppy plants." It "comes in a white or brownish powder, or a black sticky substance known as 'black tar heroin,'" and it "can be injected, smoked, or sniffed/snorted" (DEA fact sheet). The DEA lists the street names Big H, Black Tar, Chiva, Hell Dust, Horse, Negra, Smack, and Thunder. It is a Schedule I controlled substance, a category the DEA defines as "drugs with no currently accepted medical use and a high potential for abuse" (DEA).

Once in the body, heroin barely exists as heroin. A classic pharmacology study found it "is rapidly hydrolyzed in the body to two products - namely, 6-monoacetylmorphine (MAM) and morphine," with a half-life measured in minutes, and concluded that "heroin and MAM function largely as carriers to facilitate access of morphine to its receptor sites in the central nervous system" (Way et al., UNODC Bulletin on Narcotics, 1965). It crosses into the brain faster than morphine, so the rush is stronger; it is short-acting, so the drop comes sooner.

The supply itself has changed. The CDC states that "Most heroin now available in the United States is combined with IMF," its abbreviation for illegally made fentanyl (CDC, 2025). Fentanyl is "approximately 100 times more potent than morphine and 50 times more potent than heroin as an analgesic" (DEA). The DEA reports that "82 percent of heroin-related deaths involved fentanyl in 2024, according to provisional CDC reporting" (DEA, 2025). If you or someone you love uses heroin, assume fentanyl is in it.

Dependence, misuse, and addiction are not the same thing

These words get blurred together, and the confusion adds shame to a situation that already has plenty. The CDC separates them. Tolerance is needing "more opioids to experience the same effect." Then, "At higher doses over time, the body can experience opioid dependence," meaning the body has adapted and will react if the drug is removed. Addiction is the third thing: "Opioid Use Disorder (OUD), often known as addiction, is a problematic pattern of opioid use that causes significant impairment or distress" (CDC, 2025).

Dependence is pharmacology. Anyone who uses a short-acting opioid several times a day for a few weeks becomes dependent, whatever their character or willpower. What we ask members in the first conversation is not how they got here, but what heroin has started to cost and what they want back.

Signs heroin has become a problem

The signs families describe to us most often look like this. Pinpoint pupils and nodding off mid-sentence, then, a few hours later, yawning, sniffling, sweating, and irritability that lifts after a trip out. Long sleeves in summer. Money and small valuables going missing. Burnt spoons, cut straws, small wax paper bags, syringe caps. A friend who "fell asleep and wouldn't wake up" until someone used naloxone. Abscesses, a fever that would not break, or a hospital stay for a heart infection; the CDC notes that people who inject face "HIV, Hepatitis C, and Hepatitis B, as well as bacterial infections of the skin, bloodstream, and heart (endocarditis)" (CDC, 2025). Any one of these is worth a conversation. Several together are worth a call today.

Why stopping heroin is rarely the dangerous part

Heroin withdrawal is one of the most miserable experiences a body can have, and it is very rarely fatal. The World Health Organization's withdrawal management guideline puts it plainly: "opioid withdrawal is not usually life-threatening" (WHO, 2009). Alcohol and benzodiazepine withdrawal can kill on their own; opioid withdrawal, with medical attention for dehydration and for anyone who is pregnant or medically fragile, generally does not.

The danger sits on the other side. Tolerance falls within days of stopping, and the old dose becomes a lethal one. The WHO guideline instructs that "All opioid dependent patients who have withdrawn from opioids should be advised that they are at increased risk of overdose due to reduced opioid tolerance" (WHO, 2009). SAMHSA's overdose toolkit lists the risk factors we see most: "Using drugs after a recent period of abstinence, which may decrease previous tolerance levels," "Returning to drug use after leaving jail/prison or healthcare setting where a medication for opioid use disorder was not provided," and "Using drugs alone" (SAMHSA, 2023). The week after detox, the day after release, and the month after a treatment stay are the most dangerous stretches in a person's life with heroin. That is why ASAM's guideline states that detox "on its own, without ongoing treatment for opioid use disorder, is not a treatment method for opioid use disorder and is not recommended" (ASAM, 2020).

CDC's National Center for Health Statistics counted 3,984 heroin-involved overdose deaths in 2023 and 2,743 in 2024, a rate drop of 33.3 percent, inside an overall fall from 105,007 overdose deaths to 79,384 (CDC NCHS, 2026). Heroin's official share is small because the death certificate says fentanyl. The family still says heroin.

Heroin withdrawal timeline

Everyone differs. How much, how often, by what route, how much fentanyl was in the supply, and what else is involved all change the timing. The WHO guideline gives the frame for short-acting opioids such as heroin: "Onset of opioid withdrawal symptoms 8-24 hours after last use; duration 4-10 days" (WHO, 2009). Members coming off fentanyl-heavy supply often tell us the back end dragged longer than this.

First 6 to 24 hours

Anxiety, yawning, a runny nose and watery eyes, sweating, goosebumps, and craving. Sleep does not come, and the craving is already loud.

Days 1 to 3

The peak. Vomiting, diarrhea, stomach and leg cramps, deep aches, chills alternating with sweats, dilated pupils, and restlessness that makes lying still impossible. This is when "one bag to take the edge off" happens, and when a prescriber can start buprenorphine or methadone and cut the worst of it short.

Days 4 to 10

Physical symptoms fade, and appetite returns before sleep does. Mood is low, and cravings now attach to places and people rather than to the body.

Weeks 2 and beyond

Insomnia, low mood, anxiety, and an inability to feel pleasure can hang on for weeks. People are least prepared for this stretch because they expected to feel better once the sickness passed. It is also when tolerance is gone and a return to the old dose is most likely to kill.

How treatment works

The standard of care for heroin use disorder is medication. SAMHSA's Treatment Improvement Protocol on the three FDA-approved options, methadone, buprenorphine, and naltrexone, states that they "reduce illicit opioid use, retain people in treatment, and reduce risk of opioid overdose death better than treatment with placebo or no medication" (SAMHSA TIP 63, Part 1). It is blunt about detox alone: "most patients with OUD who undergo medically supervised withdrawal will start using opioids again and won't continue in recommended care." And on duration: "Arbitrary time limits on the duration of treatment with OUD medication are inadvisable."

Methadone is a full opioid agonist taken daily, and "only OTPs can dispense methadone for OUD," meaning a licensed opioid treatment program (SAMHSA TIP 63, Part 3). Buprenorphine is a partial agonist that "reduces opioid withdrawal and craving and blunts the effects of illicit opioids," and it can be prescribed in an ordinary office or by telehealth. Naltrexone is an antagonist that blocks opioids rather than replacing them.

Timing matters with two of them. Buprenorphine binds harder than heroin and can knock it off the receptor, so a first dose taken too soon causes precipitated withdrawal. TIP 63 says to start "when they are exhibiting clear signs of opioid withdrawal," generally at least 12 hours after the last use of a short-acting opioid, with "a COWS score of 12 or higher" (SAMHSA TIP 63, Part 3). Fentanyl has made this harder, and how to start is a conversation for the prescriber, not something to improvise at home. Extended-release naltrexone (Vivitrol) requires the opposite patience: its label says "an opioid-free duration of a minimum of 7-10 days is recommended for patients, to avoid precipitation of opioid withdrawal" (Vivitrol prescribing information, 2025).

Naloxone belongs in every house where heroin has been. The FDA approved Narcan 4 mg nasal spray for nonprescription sale on March 29, 2023, calling naloxone "a medication that rapidly reverses the effects of opioid overdose" (FDA, 2023). ASAM recommends naloxone for people in treatment and "their family members/significant others" (ASAM, 2020). Fentanyl test strips are the other cheap tool; the CDC notes they "typically give results within 5 minutes," though they "might not detect more potent fentanyl-like drugs, like carfentanil" (CDC, 2025).

Heroin with alcohol, benzodiazepines, or other drugs

Heroin rarely kills in isolation. The CDC states that "People often use heroin along with other drugs or alcohol. This practice is especially dangerous because it increases the risk of overdose" (CDC, 2025). Benzodiazepines and alcohol each slow breathing by a different route, and the effects stack.

The newer partner is xylazine, which the CDC describes as "a non-opioid sedative or tranquilizer" that is "not approved for use in people," cut into fentanyl and heroin to add weight. It produces "Wounds that can become infected" and, untreated, "can lead to amputation or become life threatening." The CDC also warns that "Naloxone will not reverse the effects of xylazine," but it "should still be given" because an opioid is almost always present too (CDC, 2024). We cover it in our guide to tranq (xylazine).

Injection adds its own risks. The CDC calls blood-borne infection "A deadly consequence of the opioid crisis," spread "through the sharing of contaminated syringes and drug preparation equipment" (CDC, 2026). For hepatitis C in 2023, "43% of cases with risk information were associated with using injection drugs," and "Treatment cures more than 95% of patients with hepatitis C" (CDC, 2025). Getting tested for HIV and hepatitis C is part of getting well.

Drug testing for heroin

Heroin is the opioid the "opiates" line on a standard panel was built for. The American College of Medical Toxicology explains that these immunoassays "detect morphine, and, indirectly, codeine and diacetylmorphine," because heroin "is metabolized first to 6-acetylmorphine" and then to morphine (ACMT, 2021). A morphine result cannot by itself distinguish heroin from codeine or prescribed morphine, and ACMT notes that "morphine from dietary poppy seed ingestion may produce a positive test, but it is very unlikely to exceed a cutoff of 2,000 ng/mL." The metabolite settles it: "Detecting heroin metabolite 6-monoacetyl morphine with a specific assay would differentiate poppy seed from heroin use." The flip side is that the opiate line will not see fentanyl; ACMT states that "Separate immunoassays are needed to identify the presence of oxycodone and hydrocodone, buprenorphine, methadone, tramadol, and fentanyl."

Saliva windows for heroin specifically are not well established, and we would rather say so than invent one. SAMHSA's clinical drug testing guide states that "In general, drug testing of oral fluids detects drug use during the previous 24-48 hours, regardless of the route of administration" (SAMHSA TAP 32), and the federal oral fluid guidelines note that "6-AM is statistically more likely to be detected in oral fluid than urine, regardless of the cutoff" (Federal Register, 2019).

Our members use at-home saliva screening that is assigned at random through the week. Because almost all heroin now carries fentanyl, we use lab-confirmed testing for these members rather than an instant strip: the sample goes to the lab, which runs the opiate line and a fentanyl-specific assay. If you are being tested anywhere else, ask whether fentanyl is on the panel and whether positives are lab-confirmed. You do not choose whether you test; you choose who sees the results. For most members that means their prescriber and, if they want, a spouse or parent. We explain the details in our guide to how sobriety monitoring works.

How recovery from heroin works with Accountable

We are not a detox and we do not prescribe. The medication belongs to your doctor or your program. What we provide is the part TIP 63 calls "individualized psychosocial supports" (SAMHSA TIP 63, Part 1), delivered at home, for as long as you need it.

1. Get the full picture

In the first sessions your coach maps what is actually going on: how much and by what route, what happened the last time you stopped, whether you have ever needed naloxone, and what else is in the picture, including alcohol, benzodiazepines, and stimulants. If you do not yet have a prescriber, we help you find one quickly; the gap between deciding and starting is where people get hurt. With your permission we coordinate so everyone works from the same plan.

2. Build a plan that fits your life

A plan that only works inside a facility ends the day you leave it. Your coach helps you plan around the real calendar: the daily dosing window, the corner you have to walk past, the old number still in your phone. We make sure naloxone is in the house. Daily peer group meetings and a weekly family Zoom group give your family their own place to get support.

3. Weekly check-ins through the long stretch

The flat, sleepless weeks after the sickness passes are where people quietly give up, and with heroin that is the window when a return to use is most likely to be fatal. Your coach shows up every week, and the saliva screening turns "I think he's doing okay" into a shared record that you control. When a slip happens, we treat it as information: the plan changes and the support goes up. Every coach at Accountable has their own recovery behind them, and many have been through heroin specifically.

Accountable is covered by a growing list of commercial health plans, with more added each month, and private-pay plans start at $375 per month. You can check your coverage in a few minutes or call the care team at (646) 450-7641. Families are welcome to make the first call; see our page for families.

Common questions

How long does heroin stay in your system?

Heroin itself is gone within minutes, converted to 6-monoacetylmorphine and then morphine (Way et al., 1965). Oral fluid generally reflects use in the previous 24 to 48 hours (SAMHSA TAP 32); urine windows are somewhat longer, and heavy daily use extends both.

How long does heroin withdrawal last?

For short-acting opioids like heroin, the WHO gives an onset of "8-24 hours after last use; duration 4-10 days" (WHO, 2009). Symptoms peak around days one to three; sleep and mood can take weeks longer.

Is most heroin really fentanyl now?

Yes. The CDC states that "Most heroin now available in the United States is combined with IMF" (CDC, 2025), and the DEA reports that 82 percent of heroin-related deaths in 2024 involved fentanyl (DEA, 2025).

Can I quit heroin cold turkey at home?

You can survive the withdrawal; the WHO notes it "is not usually life-threatening" (WHO, 2009). The problem is what comes after. Detox without ongoing medication is "not recommended" by ASAM because of overdose risk once tolerance is gone (ASAM, 2020). Talk to a prescriber before you stop, and keep naloxone in the house either way.

What should I do if someone who used heroin will not wake up?

Call 911, give naloxone, and start rescue breaths. SAMHSA's guidance is to "Wait 2-3 minutes before giving a second dose," then place the person "on their side with the top leg bent to support the position" (SAMHSA, 2023). If xylazine is involved they may stay sedated after breathing returns; naloxone "should still be given" (CDC, 2024), and they still need emergency care.

Sources

• Drug Enforcement Administration. Heroin drug fact sheet.

• Drug Enforcement Administration. Drug Scheduling.

• Drug Enforcement Administration. 2025 National Drug Threat Assessment. May 2025.

• Drug Enforcement Administration. Fentanyl drug fact sheet.

• Centers for Disease Control and Prevention. Heroin. Overdose Prevention, last reviewed June 9, 2025.

• National Center for Health Statistics. Drug Overdose Deaths in the United States, 2023-2024. NCHS Data Brief No. 549, January 2026.

• Centers for Disease Control and Prevention. Fentanyl. Overdose Prevention, last reviewed June 9, 2025.

• Centers for Disease Control and Prevention. What You Should Know About Xylazine. Last reviewed May 16, 2024.

• Centers for Disease Control and Prevention. Infectious Diseases in Persons Who Inject Drugs. Last reviewed June 23, 2026.

• Centers for Disease Control and Prevention. About Hepatitis C. Last reviewed January 31, 2025.

• Way EL, Young JM, Kemp JW. Metabolism of heroin and its pharmacologic implications. UNODC Bulletin on Narcotics, 1965, Issue 1.

• World Health Organization. Clinical Guidelines for Withdrawal Management and Treatment of Drug Dependence in Closed Settings, section 4.3, Withdrawal Management for Opioid Dependence. 2009, NCBI Bookshelf.

• Substance Abuse and Mental Health Services Administration. TIP 63: Medications for Opioid Use Disorder, Part 1: Introduction to Medications for Opioid Use Disorder Treatment. 2021 update, NCBI Bookshelf.

• Substance Abuse and Mental Health Services Administration. TIP 63: Medications for Opioid Use Disorder, Part 3: Pharmacotherapy for Opioid Use Disorder. 2021 update, NCBI Bookshelf.

• American Society of Addiction Medicine. The ASAM National Practice Guideline for the Treatment of Opioid Use Disorder: 2020 Focused Update. 2020.

• U.S. Food and Drug Administration. Vivitrol (naltrexone for extended-release injectable suspension), prescribing information, revised December 2025.

• Substance Abuse and Mental Health Services Administration. Overdose Prevention and Response Toolkit. PEP23-03-00-001, 2023.

• U.S. Food and Drug Administration. FDA Approves First Over-the-Counter Naloxone Nasal Spray. Press announcement, March 29, 2023.

• Stolbach AI, Connors NJ, Nelson LS, Kulig K. ACMT Practice Statement: Interpretation of Urine Opiate and Opioid Tests. American College of Medical Toxicology, September 13, 2021.

• Substance Abuse and Mental Health Services Administration. TAP 32: Clinical Drug Testing in Primary Care. SMA12-4668, 2012.

• Substance Abuse and Mental Health Services Administration. Mandatory Guidelines for Federal Workplace Drug Testing Programs: Oral Fluid. Federal Register, October 25, 2019, effective January 1, 2020.