How Long Does Withdrawal Last? Understanding the Timeline

Most acute withdrawal lasts somewhere between three days and two weeks. Where you fall in that range depends mainly on the substance, how long and how heavily you’ve used it, and whether you stop abruptly or taper with medical support. Alcohol and opioid withdrawal typically peak within the first three days and resolve within a week or so. Benzodiazepines run longer. Stimulants and cannabis are milder physically but drag psychologically.

This guide compares withdrawal timelines substance by substance, explains the stages every withdrawal moves through, and covers the two situations where withdrawal becomes genuinely dangerous.

Withdrawal Timelines at a Glance

These are typical ranges for sustained, regular use ending abruptly. A medically managed taper stretches the calendar but dramatically reduces intensity and risk, and for some substances it’s the only safe approach.

What Determines How Long Withdrawal Lasts

Four factors do most of the work in setting your personal timeline:

• The substance’s half-life. Fast-clearing drugs like alcohol and fentanyl produce withdrawal that starts sooner and burns hotter. Slow-clearing drugs like Valium and methadone start late and stretch long.
• Dose and duration of use. Years of heavy use mean deeper adaptation and a longer road back to baseline than months of moderate use.
• Polysubstance use. Alcohol plus benzodiazepines, or opioids plus stimulants, produces overlapping withdrawals that complicate each other and genuinely require medical management.
• Your health and history. Age, liver function, mental health, sleep, and previous withdrawal episodes all shift the curve. Prior severe withdrawals predict harder ones, a phenomenon called kindling that’s especially documented with alcohol.

Alcohol

Onset 6 to 12 hours. Peak 24 to 72 hours. Acute phase 5 to 7 days.

Alcohol withdrawal starts fast, often before the next morning’s coffee. Early symptoms include anxiety, shakiness, sweating, and night sweats, building toward a peak in the one-to-three-day window. That peak is where alcohol earns its reputation as one of the two dangerous withdrawals. Seizures, hallucinations, and delirium tremens, a medical emergency involving confusion and cardiovascular instability, occur in a minority of cases but can be fatal without treatment. We’ve covered what alcohol withdrawal feels like and whether it can be fatal in detail.

Anyone who has been drinking heavily and daily should treat detox as a medical event, not a willpower event. A supervised alcohol detox manages symptoms with medication and monitoring, and it’s the safest first step.

Opioids, Including Fentanyl and Heroin

Onset 8 to 24 hours. Peak days 1 to 3. Acute phase 7 to 10 days.

Opioid withdrawal is the flu from hell: bone-deep aches, vomiting, diarrhea, chills, insomnia, and crushing dysphoria. Short-acting opioids like heroin and fentanyl start within a day, while long-acting opioids like methadone may take 24 to 48 hours or more to show symptoms and then run longer. Fentanyl deserves its own note, because it accumulates in body tissue and many people find its withdrawal both quicker to arrive and longer to clear than heroin’s. Our opioid withdrawal guide compares the family in detail.

Opioid withdrawal is rarely fatal, but the week after it is the highest overdose-risk window many users ever face, because tolerance drops faster than habit. This is why medication-assisted treatment with buprenorphine or methadone, which relieves withdrawal and cuts overdose deaths roughly in half, is the standard of care rather than white-knuckle detox.

A note on maintenance medications, since the question comes up constantly. Methadone and Suboxone are opioids too, and stopping them produces withdrawal on a slower, longer curve than heroin or fentanyl, often starting one to several days out and stretching past two weeks. That’s not an argument against them. It’s an argument for tapering them deliberately, on your timeline, with your prescriber. We’ve covered Suboxone withdrawal separately.

Benzodiazepines

Onset 8 hours to several days, by half-life. Peak week 1 to 2. Acute phase 2 to 4+ weeks.

Benzodiazepine withdrawal runs the longest of the major substance classes, and it’s the other one that can kill. Short-acting drugs like Xanax and Ativan produce symptoms within hours, while long-acting Valium may take days. Rebound anxiety, insomnia, tremors, and sensory hypersensitivity dominate, and abrupt cessation after regular use carries real seizure risk. The rule has no exceptions worth discussing. Regular benzodiazepine use means tapering under medical guidance, never stopping cold, regardless of dose. Our benzodiazepine hub covers each medication.

Stimulants

Onset within hours to a day. Crash days 1 to 3. Acute phase 1 to 2 weeks.

Withdrawal from cocaine, methamphetamine, and misused Adderall looks different from the depressant withdrawals. The body isn’t in much physical danger; the mind takes the hit. The first days bring the crash, with extreme fatigue, long sleep, and intense hunger, followed by one to two weeks of low mood, irritability, vivid dreams, and strong cravings. With heavy or long-term use, depression and cravings can persist for weeks beyond that, which is where structured treatment and dual diagnosis care earn their keep, since stimulant use often sits on top of untreated depression or ADHD.

Cannabis

Onset 1 to 3 days. Peak around days 2 to 6. Acute phase 1 to 2 weeks.

Yes, cannabis withdrawal is real, and with today’s high-THC products it’s more noticeable than the conventional wisdom suggests. Irritability, anxiety, insomnia, vivid dreams, reduced appetite, and a distinctive deep fatigue are the core symptoms, typically fading within two weeks, though sleep problems can linger a month or more. It’s rarely dangerous, but it’s a leading reason quit attempts fail, and our marijuana treatment program exists because plenty of people can’t stop on the first try.

Kratom

Onset 12 to 24 hours. Peak days 2 to 3. Acute phase about a week.

Kratom acts on opioid receptors, and its withdrawal resembles a milder opioid withdrawal: aches, restlessness, runny nose, irritability, and insomnia. People who use heavily, especially concentrated extracts, report timelines closer to the full opioid experience. Our kratom withdrawal guide covers it fully.

How Withdrawal Unfolds, Whatever the Substance

Across substances, withdrawal follows a recognizable arc in three phases. Early symptoms appear as the drug clears, mild at first and building, usually manageable with hydration, food, rest, and support. The peak comes next, when symptoms reach maximum intensity for one to three days. This is the phase where medical settings matter, both for safety with alcohol and benzodiazepines and for sheer endurance with everything else, because the peak is when most unsupported quit attempts collapse. Then comes the long taper-off, as physical symptoms fade and psychological ones, including poor sleep, low mood, and cravings, take over the front seat.

What Helps at Each Phase

You can’t skip withdrawal, but you can change what it costs you. The playbook shifts as the phases do:

• Before it starts. Get a medical assessment, especially for alcohol or benzodiazepines. Decide where you’ll be, who will know, and what happens after day seven. People who plan the week after detox do far better than people who only plan the detox.
• During the early phase. Hydrate aggressively, eat small and often, and clear your calendar. Withdrawal on top of work deadlines fails twice as fast.
• At the peak. This is what medical settings are for. Medication for nausea, sleep, and anxiety turns the worst 72 hours from unbearable to manageable, and monitoring catches the dangerous complications early.
• In the long tail. Structure beats willpower. Daily routine, movement, regular meals, and a program with other people in it carry you through the weeks when motivation runs out before symptoms do.

One distinction worth keeping straight, since the words get used interchangeably. Withdrawal is what your body does when the substance stops. Detox is the managed process of getting through it. You will experience withdrawal either way. Whether it happens with support is the part you control.

When Symptoms Outlast the Timeline

Some people feel fine after the acute phase. Others run into post-acute withdrawal syndrome (PAWS), where waves of anxiety, irritability, insomnia, brain fog, and sudden cravings show up weeks or months after the last use. PAWS is more psychological than physical, it comes and goes rather than holding steady, and it’s a major driver of late relapse precisely because it arrives after everyone expects the hard part to be over. We’ve written a full guide to how long post-acute withdrawal lasts.

Which Withdrawals Are Actually Dangerous

Two kinds of danger, and they belong to different substances. Alcohol and benzodiazepines carry direct medical danger, because abrupt cessation can trigger seizures and, with alcohol, delirium tremens. These two withdrawals warrant medical supervision as a baseline, not a luxury. Opioids carry indirect danger, because the withdrawal itself passes but the tolerance loss it leaves behind turns a relapse at the old dose into an overdose. Stimulants and cannabis are physically safer but psychologically heavy, with the risk concentrated in depression and impulsivity during the crash.

If any of those risk profiles describes your situation, the move is the same. Don’t plan a solo detox. A medical assessment is free, fast, and tells you exactly what level of support your specific situation needs.

Getting Through Withdrawal in Massachusetts

The Massachusetts Center for Addiction helps people through withdrawal and into recovery at our Quincy treatment center, with medically informed detox planning, medication-assisted treatment, and structured programs from PHP through outpatient care. We’re in-network with most major commercial insurers, and we’ve covered what rehab costs in Massachusetts if that’s the question holding you back.

Call 844-486-0671 or verify your insurance online. One conversation tells you what your withdrawal will likely involve and the safest way through it.

Frequently Asked Questions

Sources

• NCBI Bookshelf — Withdrawal Management (WHO guidelines): https://www.ncbi.nlm.nih.gov/books/NBK310652/
• SAMHSA — TIP 45: Detoxification and Substance Abuse Treatment: https://store.samhsa.gov/product/tip-45-detoxification-substance-abuse-treatment/sma15-4131
• StatPearls — Alcohol Withdrawal Syndrome: https://www.ncbi.nlm.nih.gov/books/NBK441882/
• StatPearls — Opioid Withdrawal: https://www.ncbi.nlm.nih.gov/books/NBK526012/