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Withdrawal, hour by hour — and when it is safe to start.
Two questions decide whether starting Suboxone goes well: how far into withdrawal you actually are, and what you were using. Get the timing right and the misery ends the same day. Get it wrong and you can feel dramatically worse. This page is the timing.
Read this first
This page is education, not a prescription. The waiting times below are published general ranges — your number comes from a conversation about what you actually used and when. Call 479-856-1505 at any hour and get it in five minutes rather than guessing.
How withdrawal moves, hour by hour
The shape is remarkably consistent. What changes between people is the clock it runs on, which depends almost entirely on which opioid you were using.
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The first 6 to 24 hours
Early withdrawal
Anxiety and restlessness first, then a runny nose and watering eyes, yawning, sweating, gooseflesh, a racing pulse, and the legs that will not stay still. Sleep goes before anything else does. For short-acting opioids this typically begins somewhere between 8 and 24 hours after the last dose.source
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Roughly 24 to 72 hours
The peak
Stomach cramps, nausea, vomiting, diarrhea, deep muscle and joint pain, chills alternating with sweats, dilated pupils. This is the stretch people describe as the worst 48 hours of their life, and it is the stretch where almost everyone who is doing it alone goes back to using — not from weakness, but because relief is one phone call away and treatment feels like it is not.
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Day 4 to around day 10
The physical tail
The vomiting and cramping ease. What lingers is exhaustion, no appetite, aching, and broken sleep. For short-acting opioids the acute phase commonly runs about 4 to 10 days in total.source
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Weeks after
The part nobody warns you about
Low mood, poor sleep, no pleasure in ordinary things, and cravings that arrive without warning. This is where relapse risk is highest and where medication, not willpower, does the work — and where tolerance has dropped far enough that going back to your old dose is how people die.
It depends entirely on what you were using
| What you were using | Withdrawal starts | Peaks | Acute phase lasts |
|---|---|---|---|
| Heroin, oxycodone, hydrocodone, morphine, Percocet |
About 8–24 hours after the last dose | Day 1 to day 3 | Commonly 4–10 days |
| Fentanyl | Can be slower and less predictable — it stores in body tissue and releases back slowly | Varies widely | Often longer, and unevenly |
| Methadone | Usually 24–36 hours, sometimes longer | Around day 3 to day 7 | About 10 days of acute symptoms, with a longer tail |
| Kratom and 7-OH | Hours after the last dose, like short-acting opioids | Day 1 to day 3 | Days, and genuinely treatable |
Why the first dose cannot come too early
Buprenorphine — the active medication in Suboxone — attaches to the same receptors as the opioid you have been using, but it grips harder while only partially switching them on. Given while a full opioid is still occupying those receptors, it knocks the stronger drug off and replaces it with a much weaker signal. The body reads that drop as withdrawal arriving all at once. That is precipitated withdrawal, and it is the reason clinics ask you to be in early withdrawal before the first dose rather than merely finished using.
Clinical protocols generally look for objective, measurable early withdrawal before induction — commonly a Clinical Opiate Withdrawal Scale score of at least 8, and a higher threshold for patients at greater risk of a precipitated reaction, including those using fentanyl or methadone.source Guidance written before fentanyl dominated the supply often said to wait about 12 hours. For fentanyl that rule of thumb is no longer reliable, because fentanyl is stored in fatty tissue and released back into the blood slowly and unevenly.source
There is more than one way to start
If waiting is not realistic or has gone badly before, low-dose initiation — sometimes called microdosing — introduces very small amounts of buprenorphine gradually, in some circumstances without requiring a period of full withdrawal first.source Which approach fits you is exactly the sort of decision that needs a physician who knows your history rather than a generic chart.
If you have already had a bad start somewhere else
A great many patients arrive here having tried Suboxone once, having gotten violently sick, and having concluded the medication was the problem. In most cases the medication was fine and the timing was not. That is a fixable mistake, and it is worth one phone call before you write off the most evidence-supported treatment there is for opioid use disorder.
When to stop reading and call someone
- Call 911 for an overdose: unresponsive, slow or stopped breathing, blue or grey lips. Use naloxone if you have it — it is safe even if you turn out to be wrong.
- Call or text 988 for a mental health or suicidal crisis.
- Call 479-856-1505 for withdrawal that is happening right now. It is answered at 3 a.m., and if waiting until Monday is not survivable you do not have to.
Questions about withdrawal and starting
How long after my last use can I start Suboxone?
For short-acting opioids it is often in the range of 12 to 24 hours, for fentanyl frequently longer, and for methadone longer still — but the honest answer is that the number is yours, not the internet's. It depends on what you used, how much, for how long, and how your body has responded before. One phone call settles it.
What is precipitated withdrawal?
Buprenorphine binds to the same receptors as fentanyl, heroin and prescription opioids, but it holds on more tightly while only partly activating them. Started too early, it displaces the stronger opioid and the body reads the sudden drop as severe withdrawal. It is intensely unpleasant, it is not usually dangerous by itself, and it is largely preventable with correct timing.
Do I have to feel terrible before I can be treated?
For a standard start you need to be in early withdrawal — measurably, not maximally. There are also low-dose initiation approaches that introduce very small amounts of buprenorphine gradually, which can avoid the wait altogether for the right patient.
I tried Suboxone once and it made me feel far worse. Is it just not for me?
Usually what happened was a timing mismatch, not a medication failure — most often buprenorphine started too soon after fentanyl. A bad first attempt is information about the induction, not a verdict on the treatment. It is worth one conversation before you rule it out for good.
Is opioid withdrawal dangerous?
On its own it is usually not life-threatening, though it is genuinely miserable, and dehydration from vomiting and diarrhea can become a real medical problem. The larger danger is what comes after: tolerance drops during withdrawal, so a return to a previous dose carries a high overdose risk. If you are in withdrawal alongside alcohol or benzodiazepines, that combination needs medical supervision.
Can I just do this at home by myself?
People try, and the reason it usually fails is not weakness — it is that the worst 48 hours arrive at 3 a.m. with nobody to call. Here, the number is answered at 3 a.m.
What about kratom or 7-OH?
They are sold legally in gas stations and they are genuinely addictive. Withdrawal from kratom and 7-hydroxymitragynine is real, it looks much like opioid withdrawal, and it is treatable.
Sources
- American Addiction Centers, drug withdrawal timelines — https://americanaddictioncenters.org/withdrawal-timelines-treatments
- British Columbia Centre on Substance Use, “Withdrawal Management” clinical resource — https://www.bccsu.ca/wp-content/uploads/2022/02/LOUDintheED-Withdrawal-Management.pdf
- British Columbia Centre on Substance Use, “Buprenorphine Basics — ED Induction” — https://www.bccsu.ca/wp-content/uploads/2021/12/LOUDintheED-Buprenorphine-Basics-ED-Induction.pdf
- Tennessee Department of Mental Health and Substance Abuse Services, buprenorphine eligibility and induction protocol — https://www.tn.gov/content/dam/tn/mentalhealth/documents/Buprenorphine_Sample_Protocol_Final.pdf
- New York State OASAS, “Low and High Dose Initiation of Buprenorphine” — https://oasas.ny.gov/system/files/documents/2022/07/low-high-dose-buprenorphine-initiation.pdf
Withdrawal keeps no office hours. Neither does he.
Tell him what you used and when, and he will tell you exactly when it is safe to start — tonight, if that is what it comes to.
Call 479-856-1505 — any hourIn a life-threatening emergency call 911. For a mental health crisis, call or text 988.