Substance Addictions We Cover

16 substance use disorders, their withdrawal risks and the treatments that work for each

Medically reviewed by Daniel Okafor, PMHNP-BC Last updated September 18, 2026
At a Glance
  • The substance changes the treatment — risk, medication and timeline all differ
  • Alcohol & benzo withdrawal can be fatal — detox under medical supervision
  • Opioids have life-saving medications; stimulants rely on behavioral therapy
Substance Addictions

Why the Substance Changes the Treatment

Addiction is one disorder, but it does not behave the same way with every substance. What a person is dependent on determines whether withdrawal is medically dangerous, how long the acute phase lasts, whether an approved medication exists, and how quickly the brain recovers. A program that treats alcohol dependence and methamphetamine dependence identically is not treating either well.

The most important distinction is medical risk. Withdrawal from alcohol, benzodiazepines and other sedatives can produce seizures and delirium tremens and is occasionally fatal; those substances require supervised detox or a slow taper. Opioid withdrawal is agonising but rarely dangerous on its own — the real risk is the sharp drop in tolerance that makes a return to a previous dose lethal, particularly now that fentanyl dominates the illicit supply. Stimulant withdrawal is not physically dangerous but carries a real risk of severe depression and suicidal thinking during the crash.

The second distinction is medication. Opioid use disorder has three FDA-approved medications that roughly halve mortality, and alcohol use disorder has three more. Stimulant, cannabis and most other use disorders have none, which means behavioral treatment — especially contingency management for stimulants — carries the full weight. Knowing which category you are in tells you what to demand from a program.

One more thing has changed the landscape: almost nobody uses a single substance any more. Fentanyl is pressed into counterfeit pills sold as oxycodone, Xanax and Adderall, and it appears in stimulant supplies. Polysubstance use complicates every calculation on this page, and any honest assessment should ask about everything you use, not just the one that brought you in. Select a substance below for its dedicated guide, and read the withdrawal-risk table before you make any decision about stopping.

If you drink daily or take benzodiazepines regularly, do not stop suddenly on your own. Withdrawal from either can cause seizures and can be fatal. Call us at 1-888-685-2199 or the SAMHSA National Helpline at 1-800-662-4357 to arrange a supervised detox. If you use opioids, carry naloxone (Narcan) — tolerance drops within days of stopping, and a previously normal dose can be lethal on return.

Substance Use Disorders

Select a substance to see specialised treatment centers and detailed guidance in our directory.

Alcohol

The most widely misused substance in the United States. Heavy daily drinking creates physical dependence, and unmanaged withdrawal can cause seizures or delirium tremens.

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Opioids / Opiates

A drug class spanning heroin, fentanyl and prescription painkillers. Dependence develops fast, and FDA-approved medications cut the risk of overdose death roughly in half.

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Heroin

An illicit opioid now almost always adulterated with fentanyl in the US supply. Withdrawal is rarely fatal but severe enough that most people relapse without medication support.

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Fentanyl

A synthetic opioid roughly fifty times stronger than heroin and the leading cause of US overdose deaths. It stores in fat tissue, so withdrawal often lasts longer than expected.

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Prescription Painkillers

Oxycodone, hydrocodone and morphine prescribed legitimately but capable of producing dependence. Many people transition to illicit opioids once a prescription ends.

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Cocaine

A short-acting stimulant producing intense psychological craving. No medication is approved yet, so contingency management and behavioral therapy are the effective treatments.

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Crack Cocaine

Smokable freebase cocaine that reaches the brain within seconds, giving a shorter, more intense high and a faster path to compulsive binge use than powder cocaine.

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Methamphetamine

A long-acting stimulant that disrupts dopamine systems, causing psychosis, severe insomnia and cognitive problems. Recovery takes longer and structure matters more.

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Benzodiazepines

Xanax, Ativan and Klonopin. Stopping abruptly after regular use can cause seizures and is potentially fatal — a slow, medically supervised taper is mandatory.

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Marijuana

Cannabis use disorder is real: roughly one in ten users develops it. High-THC concentrates drive withdrawal marked by irritability, insomnia and appetite loss.

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MDMA/Ecstasy

An empathogenic stimulant used in social and club settings. Repeated use depletes serotonin, causing depression and memory complaints; pills are frequently adulterated.

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Ketamine

A dissociative anesthetic with legitimate clinical uses. Frequent recreational use causes severe bladder damage, memory impairment and strong psychological dependence.

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Adderall / Stimulants

Prescription amphetamines misused for study, work performance or weight control. Dependence brings cardiovascular strain, insomnia and a crash into depression on stopping.

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Kratom

A Southeast Asian plant that acts on opioid receptors. Largely unregulated, it produces genuine opioid-type dependence and withdrawal in people who use it daily.

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Nicotine

The most addictive substance in common use and the leading preventable cause of death. Treating it during rehab improves, rather than undermines, other recovery outcomes.

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Polysubstance

Using several substances together, now the norm rather than the exception. It complicates detox, raises overdose risk sharply and demands a single integrated treatment plan.

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Withdrawal Risk by Substance Class

Timelines are typical ranges for adults and vary with dose, duration of use and health status. This is general education, not medical advice.

Compiled from SAMHSA TIP 45 (Detoxification and Substance Abuse Treatment) and NIDA clinical guidance. Always seek an individual medical assessment before stopping any substance.
Substance classMedically dangerous withdrawal?Typical acute timelineDetox setting usually needed
AlcoholYes — seizures and delirium tremens are possibleOnset 6–24 hrs, peak 24–72 hrs, resolves in 5–7 daysInpatient medical detox for daily or heavy drinkers
Benzodiazepines & sedativesYes — seizures, and symptoms can be protractedOnset 1–4 days; taper typically runs weeks to monthsPhysician-supervised gradual taper; never abrupt
Opioids (heroin, fentanyl, painkillers)Rarely fatal alone, but dehydration and lost tolerance are serious risksOnset 8–24 hrs (short-acting) or 12–48 hrs (methadone, fentanyl); 4–10 days acuteMedical detox plus immediate start on buprenorphine or methadone
Stimulants (cocaine, meth, Adderall)Not usually medically dangerous, but suicide risk rises during the crashCrash 1–3 days; low mood, sleep disruption and craving for 2–8 weeksResidential or intensive outpatient with mental health monitoring
CannabisNoOnset 1–3 days, peak within a week, mostly resolved in 1–2 weeksOutpatient care is normally sufficient
NicotineNoPeaks around day 3, largely resolves within 2–4 weeksOutpatient with nicotine replacement or varenicline
KratomOpioid-type; not usually dangerousOnset 12–24 hrs, acute phase 3–7 daysOutpatient, or medical detox for heavy daily use
PolysubstanceAssume the risk of the most dangerous substance involvedOverlapping and unpredictable timelinesInpatient medical detox

Substance Addictions We Cover: Frequently Asked Questions

Alcohol and benzodiazepines are the two that can kill you. Both act on the GABA system, and abrupt cessation after sustained use can trigger seizures and, in alcohol's case, delirium tremens, which still carries meaningful mortality when untreated. Other sedatives such as barbiturates and z-drugs carry similar risk. Opioid withdrawal is extremely unpleasant but rarely fatal in itself; the danger comes afterwards, from lost tolerance. Stimulant and cannabis withdrawal are not medically dangerous, though stimulant crashes can produce severe depression that requires monitoring.
For cannabis, nicotine and often stimulants, home detox with medical advice is reasonable. For alcohol, benzodiazepines or any sedative, it is genuinely risky and should not be attempted without a doctor. For opioids, home detox is survivable but has a very high relapse rate and, because tolerance falls fast, a meaningfully elevated overdose risk in the weeks that follow. The safer path with opioids is not detox at all but starting buprenorphine or methadone, which removes withdrawal without the tolerance cliff.
Most accredited centers treat the full range, but their depth varies. A facility with an on-site opioid treatment program or buprenorphine prescriber is better equipped for opioid dependence; one with a contingency management program is better for methamphetamine or cocaine; one with medical staffing experienced in complex tapers is better for long-term benzodiazepine use. When you call, ask directly how many people they treated for your specific substance last year and what medications they prescribe.
It means detox must be planned around the most dangerous substance in the mix, and that a single treatment plan has to address all of them. Someone who drinks heavily and uses cocaine cannot safely be detoxed as though only cocaine mattered. Polysubstance use also raises overdose risk sharply, because depressant effects compound — alcohol plus opioids plus benzodiazepines is the combination behind a large share of fatal overdoses. Be completely honest during assessment, including about anything prescribed.
Acute craving typically peaks in the first one to two weeks and declines substantially over the first three months, but it does not vanish on a schedule. Stimulant users often describe a difficult window around weeks three to eight, sometimes called the wall, when mood and motivation are still flat. Cue-triggered craving — set off by a place, person or feeling — can arise years later and is normal rather than a sign of failure. Relapse prevention planning exists precisely for those moments.
No medication is FDA-approved for stimulant use disorder as of now, though several are under active study and some clinicians prescribe off-label combinations such as bupropion with naltrexone, which showed promise in recent NIDA trials. The strongest available treatment is contingency management, which provides tangible rewards for verified negative drug tests and has larger effect sizes than any other intervention for this group. If you are seeking treatment for stimulant use, ask specifically whether the program offers it.
Because it is far more potent than heroin and because it is highly fat-soluble, meaning it accumulates in body tissue and releases slowly. People commonly find withdrawal starts later, lasts longer and is harder to stabilise on buprenorphine, since starting too early can precipitate severe withdrawal. Experienced programs handle this with adjusted induction protocols, including low-dose or microdosing approaches. Ask whether a center has specific experience with fentanyl induction — the answer separates current practice from outdated protocols.

Explore Other Treatment Categories

Every treatment option in our directory is organised into six browsable categories. Start anywhere — or call and let a specialist narrow it down for you.

Levels of Care Evidence-Based Therapies Specialty Programs Dual Diagnosis Medication-Assisted Treatment All Treatment Resources

Get Help for Any Substance, Today

Whatever you are using, treatment exists and it works. Speak with a specialist about detox options, medication and centers near you. Confidential, no obligation.

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