Opioid Withdrawal Timeline — What to Expect Day by Day
Opioid withdrawal follows a predictable pattern. That's actually useful to know — it means you're not going crazy, and the worst of it doesn't last forever.
But the timeline isn't one-size-fits-all. It depends heavily on which opioid you're coming off. Short-acting opioids — oxycodone, heroin, codeine, hydrocodone — hit fast and resolve sooner. Long-acting opioids — methadone, extended-release formulations — take longer to kick in and drag on considerably further. Both require medical supervision for heavy or long-term users. Here's the day-by-day breakdown.
Short-Acting Opioids (Oxycodone, Heroin, Codeine, Hydrocodone)
Short-acting opioids clear your system quickly. That means withdrawal starts fast. Understand how long opioids stay in your system to get a clearer picture of why the timing works this way.
Hours 6–12: First Symptoms Arrive
Your body figures out it's not getting what it expects. The earliest signs are easy to dismiss — until they're not.
- Anxiety and creeping restlessness
- Muscle aches, particularly in the legs and back
- Yawning, sweating
- Difficulty sleeping
At this stage it can still feel manageable. That changes quickly.
Hours 12–24: Escalation
The symptoms ramp up. Now you know this is real.
- Abdominal cramps begin
- Nausea sets in
- Runny nose, watering eyes
- Increased sweating
- Agitation becomes harder to sit with
This is when a lot of people use again just to make it stop. That's not weakness — it's physiology. Your brain has been restructured around opioid availability. It's screaming at you.
Days 1–3: Peak Withdrawal
This is the worst of it. Days 2 and 3 are typically the hardest for short-acting opioids.
- Vomiting and diarrhoea (often simultaneously — it's brutal)
- Severe abdominal cramps
- Goosebumps, chills, hot flushes cycling back and forth
- Dilated pupils
- Elevated heart rate and blood pressure
- Intense cravings that make it hard to think about anything else
- Profound insomnia despite complete exhaustion
The physical misery is real. Dehydration becomes a genuine concern — keep fluids down if you possibly can. This is also the phase where medical support makes the biggest difference. Medications exist that can take the edge off significantly. You don't have to white-knuckle through it.
Days 4–7: Decline
The acute physical symptoms begin pulling back. You're not fine, but you're not in the thick of it anymore.
- Vomiting and diarrhoea typically resolve
- Muscle aches ease off
- Appetite starts to return (even if food sounds repulsive)
- Fatigue, irritability, and insomnia persist
- Cravings remain strong
Most people start to feel human again somewhere in this window. The relief is real — but don't mistake easing physical symptoms for being through it entirely.
Days 7–14: Physical Resolution, New Phase Beginning
The acute opioid withdrawal symptoms are largely resolved. If that were the whole story, this would be easy.
It isn't. Post-acute withdrawal syndrome (PAWS) is starting — more on that below.
Long-Acting Opioids (Methadone, Extended-Release Formulations)
Long-acting opioids behave differently. They linger in the system, which delays when withdrawal begins — but doesn't make it gentler in the long run. Methadone in particular has a half-life that means symptoms can take over a day to even show up.
Hours 24–48: First Symptoms (Delayed Onset)
Where short-acting withdrawal starts in under 12 hours, long-acting opioids give you a deceptive grace period. Then the same early symptom profile arrives: anxiety, restlessness, muscle aches, sweating, insomnia, yawning.
Don't let the delay fool you. It's coming.
Days 3–5: Symptoms Building
The same symptom profile as short-acting withdrawal — nausea, cramps, runny nose, tearing — arrives on a slower curve. It can feel like a long, grinding build rather than a sharp spike.
Days 5–10: Peak Withdrawal
For long-acting opioids, peak withdrawal tends to land somewhere in this window. The intensity may be somewhat lower than the sharpest point of short-acting withdrawal — but it lasts considerably longer. Five days of moderate-to-severe withdrawal is not easier than three days of severe withdrawal. It's just differently awful.
Medical supervision during this phase is not optional for heavy long-term users. Complications including severe dehydration, cardiac stress, and significant mental health crises can emerge. Managed detox exists for good reason.
Days 10–21: Gradual Resolution
Symptoms begin to ease, but slowly. For methadone in particular, some users report physical symptoms persisting beyond day 14. Fatigue and insomnia can drag on well into week three.
Cravings in this phase can be deceptive — they come in waves rather than a constant roar, which makes them harder to predict and prepare for.
Summary Timeline at a Glance
| Phase | Short-Acting Opioids | Long-Acting Opioids |
|---|---|---|
| First symptoms | 6–12 hours | 24–48 hours |
| Peak | Days 1–3 | Days 5–10 |
| Acute phase ends | Days 7–10 | Days 14–21 |
| PAWS begins | ~Week 2 | ~Week 3 |
| PAWS duration | Weeks to months | Weeks to months |
Post-Acute Withdrawal (PAWS) — The Phase Nobody Talks About
Here's what the basic timelines leave out: acute withdrawal ending doesn't mean withdrawal is over.
PAWS — post-acute withdrawal syndrome — is the extended phase that follows the acute period. It doesn't get talked about enough, which means it catches people completely off guard.
What PAWS looks like:
- Anxiety that arrives without obvious triggers
- Low mood, emotional flatness, difficulty feeling pleasure (anhedonia)
- Insomnia — difficulty falling asleep, staying asleep, or both
- Difficulty concentrating or thinking clearly
- Cravings that arrive in waves, sometimes weeks apart
- Irritability and mood swings
Why it matters:
PAWS is what drives a large proportion of relapses. Not the brutal first week — people often white-knuckle through that. It's week six, when life is supposed to be normalising, and you feel flat and foggy and suddenly get hit with an out-of-nowhere craving. That's PAWS.
Knowing it's coming doesn't eliminate it. But it means you're not blindsided. You're not "broken." You're not failing. Your brain chemistry is recalibrating — a process that takes longer than a few weeks for most people.
PAWS can last weeks to months. For heavy, long-term opioid use, some symptoms can persist longer. This is one of the strongest arguments for medication-assisted treatment — it supports that recalibration process rather than leaving it entirely to time and willpower.
Why Medical Supervision Is Critical
Let's be direct about this.
Cold turkey opioid withdrawal is rarely dangerous in the way that alcohol or benzodiazepine withdrawal can be — it won't typically kill you directly. But that framing undersells the real risks.
Severe dehydration from vomiting and diarrhoea can cause serious complications. Cardiovascular stress during peak withdrawal is real. And the psychological intensity — the crushing insomnia, the depression, the cravings — creates conditions where people make decisions they wouldn't otherwise make.
More practically: you don't have to suffer as much as the unmanaged timeline suggests. Medication-assisted treatment (MAT) — including buprenorphine, methadone, and naltrexone — dramatically changes both the timeline and the experience.
This is not "replacing one drug with another." That's a persistent myth that causes real harm. These medications stabilise brain chemistry, reduce cravings, and improve outcomes in every measurable way. The evidence behind MAT is substantial. People treated with MAT stay off opioids at far higher rates than those who attempt abstinence alone.
Trying to tough this out unassisted when help exists isn't strength. It's making the process harder and increasing your risk.
Talk to a doctor. If your current doctor isn't supportive, find one who is. If you need somewhere to start, our quit opioids resource covers your options.
The Tolerance Warning — Read This
This section is short. Please read it.
After even a few days without opioids, your tolerance drops. Fast.
The dose that felt normal before — the amount you needed just to feel okay — can be fatal now. This is not an exaggeration. Most opioid overdose deaths happen during relapse, not at the height of heavy use. People return to their previous dose after a period of abstinence and their body can no longer handle it.
If you relapse after any period of abstinence, use significantly less than your previous dose.
Never use alone.
If you're in crisis right now, go to crisis support.
FAQ
How long does opioid withdrawal last?
For short-acting opioids (oxycodone, heroin, hydrocodone, codeine), acute withdrawal typically runs 7–10 days. For long-acting opioids (methadone, extended-release formulations), the acute phase can extend to 14–21 days. After acute withdrawal, post-acute withdrawal syndrome (PAWS) can persist for weeks to months — causing anxiety, insomnia, mood disruption, and periodic cravings.
When is the worst day of opioid withdrawal?
For short-acting opioids, days 2 and 3 are typically the peak. For long-acting opioids, peak intensity usually falls between days 5 and 10. Individual factors — how long you've been using, how heavily, your general health — affect this. Medical supervision can significantly reduce the severity of the peak period.
Can medication help with opioid withdrawal?
Yes — and the evidence is clear that it helps considerably. Buprenorphine, methadone, and naltrexone are the primary medication-assisted treatments for opioid use disorder. Each works differently and has different appropriate use cases. Loperamide can help with diarrhoea; other non-opioid medications can address specific symptoms. A doctor can help determine what's appropriate for your situation. Going without support is a choice, but it's not the only one available to you.
Written by 180 - Benjy. This article is for informational purposes only and does not constitute medical advice. Opioid withdrawal can involve serious physical and psychological complications. If you're considering stopping opioid use, speak with a qualified healthcare provider before doing so. This site does not recommend specific medication dosages. Always work with a doctor.
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