Opioid withdrawal: symptoms, timeline, and treatment
Opioid withdrawal is what happens when a body used to opioids goes without them. It tends to feel like a severe flu. By itself it is seldom deadly. But it carries real dangers, and medicine can make it far easier. You do not have to white-knuckle this.
Why does opioid withdrawal happen?
Withdrawal happens because a body used to opioids adjusted to them, and when the opioid stops that adjustment rebounds the other way.
Opioids change how your brain and body work. With steady use, your system adjusts and comes to expect the drug. This is called dependence, and it can happen to anyone, including people taking opioids exactly as prescribed. When the opioid stops, your system rebounds hard in the other direction. That rebound is withdrawal. Dependence is not the same thing as addiction, though they often travel together.[2]
Two things follow from that, and they are worth holding onto while you read the rest.
First, withdrawal is not a punishment or a test of character. It is a body that adjusted, now doing the reverse. Second, it is a body process, so it answers to body treatment. Medicine works here, and taking it is the treatment, not a loophole.
What are the symptoms of opioid withdrawal?
Opioid withdrawal feels like a severe flu plus dread: watering eyes, sweating, aches, cramps, vomiting, no sleep, and strong cravings.
Early on (often the first day): worry and the jitters, yawning, teary eyes, runny nose, sweating, goosebumps, poor sleep, and strong cravings.
At the peak: muscle and bone aches, chills, stomach cramps, throwing up, diarrhea, a racing heart, higher blood pressure, wide pupils, and feeling hot and cold in waves.
Mood symptoms are real symptoms too: worry, a short fuse, and low mood can outlast the physical part.[1][2]
| Phase | What the body is doing | What people notice most |
|---|---|---|
| Early | The rebound starts; the nervous system speeds up | Restlessness, yawning, watering eyes and nose, sweating, cravings[1][2] |
| Peak | The rebound at full strength | Aches, cramps, vomiting, diarrhea, chills and sweats in waves, no sleep[1][2] |
| Easing | The body starts resetting | Weakness, low mood, poor sleep, cravings that come in waves[1][2] |
If you have been through this before, you may remember only how bad the peak was. That memory is doing two jobs at once. It tells the truth about how it felt, and it leaves out the one fact that matters now: last time, you likely did it without medicine. This time does not have to match.
How long does opioid withdrawal last?
Short-acting opioids run about 4 to 10 days, long-acting ones up to 20, and street fentanyl can start later and linger.
| Opioid type | Starts | Peaks | Eases |
|---|---|---|---|
| Short-acting (heroin, oxycodone, hydrocodone) | 8-24 hours after last use | Days 1-3 | Days 4-10 |
| Long-acting (methadone, slow-release pills) | 12-48 hours | Days 3-8 | Days 10-20 |
| Street fentanyl | Can start later than expected | Days 1-3, often longer | May linger past day 10 |
Oxycodone (OxyContin, Percocet) follows the short-acting row; slow-release forms behave more like the long-acting row.
These windows vary by person, dose, and length of use.[1]
After the acute phase, some people have weeks or months of milder waves: poor sleep, low mood, cravings. Doctors call this post-acute withdrawal. It fades, and treatment and support make it easier (flag: reviewer to confirm framing; PAWS evidence base is mixed).
How bad it gets is measurable, and worth measuring
How bad it gets tracks your dose, your drug, how long you used, and your health, and staff can score it with a short checklist.
It depends on how much you used, how long, which opioid, and your health. Doctors often score withdrawal with a short checklist, the COWS scale. It rates things like pulse, sweating, and the jitters. The medicine is then matched to the score. You can ask for that check.[4]
What is the COWS check?
COWS is a few minutes of a nurse or doctor rating 11 withdrawal signs and adding up the score; no needle, no lab.
COWS stands for the Clinical Opiate Withdrawal Scale. A doctor or nurse spends a few minutes rating 11 things and adds up the score.[4] There is no needle and no lab. You will be asked how you feel, and they will look at you.
The 11 items are resting pulse, sweating, and shaking. Then restlessness, pupil size, and aching bones or joints. Then a runny nose or watering eyes, an upset stomach, yawning, a short fuse or worry, and goose bumps.[4]
| Total score | What it means |
|---|---|
| 5 to 12 | Mild withdrawal[4] |
| 13 to 24 | Moderate[4] |
| 25 to 36 | Moderately severe[4] |
| More than 36 | Severe withdrawal[4] |
Here is why the score matters to you and not just to the staff. It often decides when buprenorphine can be started safely. Being honest about how bad you feel is the input to the decision, and no one hears it as complaining.
Insight: the check is a door, not a judgment. People often play down how bad they feel. Out of habit, out of shame, or out of fear of being labeled. Playing it down can delay the medicine that would end the misery. The scale exists to match treatment to what your body is doing, and it only works on real answers.[4]
The danger that kills is not the withdrawal
The withdrawal itself is seldom deadly; the danger is overdose after your tolerance drops, plus fluid loss and other health problems.
Insight: the fatal math of a short break. Days 1 through 10 of withdrawal quietly reset your tolerance toward zero, but the street dose stays the same. That mismatch, not the withdrawal itself, is what fills overdose statistics after detox, jail, and abstinence-only programs.[1][3]
- Overdose after your tolerance drops. This is the one that kills. A few days without opioids lowers your tolerance. The dose you handled last week can stop your breathing this week. If you return to use, use less, never alone, and have naloxone nearby. How to use naloxone
- Dehydration. Vomiting plus diarrhea can drain you fast. If you cannot hold fluids down for a day or more, get medical care.
- Other conditions. Heart problems, pregnancy, and some illnesses make untreated withdrawal riskier. Tell your care team what you are stopping and what else you have.[1][2]
Get emergency care if: you cannot keep any fluid down for a day, you feel faint or your heart is racing at rest, you have chest pain, you are confused, or you are having thoughts of harming yourself. Withdrawal is miserable everywhere. These signs mean it has stopped being only miserable.
What medicines help opioid withdrawal?
Buprenorphine and methadone treat the withdrawal itself and cut overdose deaths; lofexidine, clonidine, and comfort medicines handle the symptoms.
Insight: why buprenorphine can start mid-withdrawal. It sits on the same receptors opioids use, partway on. Started too early it can set off withdrawal. Started during it, it relieves it. That is why the timing belongs to a doctor who has done this before.[2][3]
Buprenorphine (Suboxone) and methadone treat the withdrawal itself, not just the edges. They calm symptoms and cravings, and they cut overdose deaths. They are treatment, not a new addiction. Doctors can start buprenorphine during withdrawal.[2][3]
Symptom medicines can be added. Clonidine for the fight-or-flight surge. Medicine for the nausea. Short-term sleep aids. Plain pain relievers like ibuprofen for the aches.[4]
| Medicine | What it is for | How it is used | Worth knowing |
|---|---|---|---|
| Methadone | Withdrawal and ongoing treatment | Through approved opioid treatment programs; daily at first for most people[6] | Acts on the same receptors slowly and stays in the body longer, so symptoms and cravings settle[6] |
| Buprenorphine | Withdrawal and ongoing treatment | Prescribed by many doctors, nurse practitioners, and physician assistants[6] | Timing of the first dose matters; too early can trigger withdrawal[4][6] |
| Lofexidine | Withdrawal symptoms only, up to 14 days[4] | Prescribed during the acute phase | Not an opioid; it eases the surge, it does not treat the disorder[4] |
| Clonidine | Withdrawal symptoms only | Often used alongside other care[4] | Blood-pressure medicine used for the sweating, racing pulse and jitters[4] |
| Naltrexone | Preventing return to use, after withdrawal is finished | Any health care provider can prescribe it[6] | You usually need 7 to 10 days fully off opioids first, or it triggers withdrawal[6] |
People treated with methadone or buprenorphine are less likely to die, and less likely to overdose, than people who get no treatment.[6]
What is precipitated withdrawal?
Precipitated withdrawal is withdrawal a medicine sets off suddenly, which is why staff ask the exact hour of your last use before the first dose.
Precipitated withdrawal is withdrawal that a medicine sets off, suddenly, instead of easing. It is the reason staff ask when you last used before giving you buprenorphine.
Here is the mechanism in plain terms. Buprenorphine holds onto opioid receptors tightly, but only switches them partway on. If a fuller opioid is still sitting on those receptors, buprenorphine pushes it off and replaces a strong signal with a weaker one. Your body reads that drop as sudden withdrawal.[4][6]
That is why the timing rule exists. Buprenorphine is typically started 12 to 18 hours after the last short-acting opioid such as heroin or oxycodone, and 24 to 48 hours after a long-acting one such as methadone.[4] With street fentanyl the picture is harder. Fentanyl leaves the body more slowly than its speed suggests, so a slower, low-dose start may be used (flag: reviewer confirm low-dose initiation framing).
What this means for you is short. Tell the truth about your last use, including the exact hour. No one is laying a trap; the hour you name is the number that keeps the first dose from making you feel worse.
Three ways people stop, and the one we warn against
Three ways people stop: medicine-supported withdrawal, a slow taper with the prescribing doctor, or cold turkey alone, which is the one we warn against.
- Medicine-supported withdrawal through a doctor or program: the safest path, the least painful, and the most likely to last.
- A slow taper worked out with the doctor who prescribes, for people stopping prescribed opioids.
- Cold turkey, alone: it fails often, feels brutal, and sets up the overdose risk above. We do not recommend it. If you are set on it, tell someone, keep fluids up, and keep naloxone in the house.
We will not publish a home taper schedule, and self-protection has nothing to do with it: the right schedule depends on your dose, your drug, and your health, and a page cannot know any of those. Getting that wrong is how people end up sicker than they needed to be, or dead from a return to use.
What happens in medical detox | Detoxing at home: the real risks
What does a day in medical detox look like?
A detox day is a history, vital signs, a withdrawal score, medicine matched to that score, and then the same checks repeating.
People avoid detox partly because they cannot picture it. Here is the shape of it, so it is a known thing rather than a rumor.
You arrive and someone takes a history: what you use, how much, how long, when you last used, what else you take, what health conditions you have. Being accurate here is the single most useful thing you do all day.[4]
Someone checks your vital signs and scores your withdrawal, usually with the COWS checklist.[4] Medicine is matched to that score: buprenorphine or methadone for the withdrawal itself, plus medicines for nausea, cramps, and the racing, jittery feeling.[4]
Then the day repeats: checks, scoring, adjusting. Most of it is boring, and boring is the goal.
Before you leave, the important conversation looks past the days you just finished, to what happens next, because your tolerance is now lower than it was when you arrived.
Small things that help while the medicine works
Alongside medicine: fluids in small sips, food that stays down, rest, short walks, and one person checking on you daily.
These help alongside medical care, not instead of it: drink more fluid than feels natural, in small sips if needed. Eat what stays down. Rest without demanding sleep. Move a little when you can; short walks ease the jitters. Line up one person to check on you daily. Fear feeds on being alone with it.
After the acute phase: the part nobody warns you about
After the acute days, sleep, mood, and cravings can stay rough for weeks, and staying on medication through that stretch is the most protective thing available.
The acute days end and people expect to feel normal. Often they do not, quite. Sleep stays broken. Mood runs low. Cravings arrive in waves, sometimes weeks later, often attached to a place or a time of day rather than a thought.
Doctors call this post-acute withdrawal. Be aware that the evidence for it is mixed, and experts disagree about how to define it (flag: reviewer to confirm framing).[2]
What is not in dispute is the practical part. This stretch is when many people return to use, and they often do it believing something has gone wrong with them. Nothing has gone wrong. A nervous system that spent months or years adjusting does not finish resetting in a week. Staying on medication through this stretch is the single most protective thing available.[6]
Pregnant? Do not stop suddenly; get same-day advice
Do not stop opioids suddenly on your own while pregnant. Withdrawal can stress the pregnancy, and medication treatment (methadone or buprenorphine) is the standard of care. Talk with a doctor the same day (flag: reviewer to add ACOG citation).
The after-plan: written before you need it
Write four lines before discharge: medication decided, naloxone in the house, a rule for a return to use, and one person to call first.
The most dangerous day is not the worst day of withdrawal. It is a day some weeks later, when the misery has faded and the caution fades with it.
A plan made in advance beats a decision made in the moment. Four lines are enough.
- Medication decided before discharge, not after. Methadone, buprenorphine, or naltrexone, with the first appointment already booked.[6]
- Naloxone in the house, and one other person who knows where it is. How to use naloxone
- A rule for a return to use: less than you think, never alone, never behind a locked door.
- One person to call before using, not after. Name them now.
If you return to use, that is information, not a verdict. Tell your prescriber the truth and adjust the plan. People who stay in treatment through a return to use do better than people who disappear from it.[6]
Next step
You can find detox and treatment programs near you. Or start with the SAMHSA Helpline: 1-800-662-HELP (4357), free and private, always open.[5] If fear of withdrawal is what keeps you using, say exactly that. There is medicine for it.
Medical Sources & References
Medical references (6)
- WHO · World Health OrganizationClinical Guidelines for Withdrawal Management and Treatment of Drug DependenceWHO. Clinical Guidelines for Withdrawal Management (NCBI Bookshelf NBK310652). Accessed 2026-08-02.View source (opens in a new tab)
- Cleveland ClinicOpiate and Opioid WithdrawalCleveland Clinic. Opiate and Opioid Withdrawal (medically reviewed 2024-08-28). my.clevelandclinic.org. Accessed 2026-08-02.View source (opens in a new tab)
- NIDA · National Institute on Drug AbuseUnderstanding Drug Use and Addiction (DrugFacts)National Institute on Drug Abuse. Understanding Drug Use and Addiction; treatment materials. nida.nih.gov. Accessed 2026-08-01. (Terminology per ASAM, asam.org, accessed 2026-08-01.)View source (opens in a new tab)
- StatPearls · NCBI · National Center for Biotechnology InformationOpioid WithdrawalStatPearls. Opioid Withdrawal, NBK526012. ncbi.nlm.nih.gov/books/NBK526012. Accessed 2026-08-02; re-verified 2026-08-08 for COWS items, buprenorphine initiation windows, lofexidine 14-day limit, and symptom medicines. COWS score bands per National Institute on Drug Abuse, Clinical Opiate Withdrawal Scale (nida.nih.gov/sites/default/files/ClinicalOpiateWithdrawalScale.pdf), accessed 2026-08-08.View source (opens in a new tab)
- SAMHSA · Substance Abuse and Mental Health Services AdministrationNational HelplineSAMHSA. National Helpline. samhsa.gov. Accessed 2026-08-01.View source (opens in a new tab)
- NIDA · National Institute on Drug AbuseMedications for Opioid Use DisorderNational Institute on Drug Abuse. Medications for Opioid Use Disorder. nida.nih.gov/research-topics/medications-opioid-use-disorder. Accessed 2026-08-08.View source (opens in a new tab)
Sources are checked and updated periodically.
