Opioid Withdrawal: Symptoms, Timeline & Safe Detox

Medically reviewed by Dr. Eric Chegouri, MD, Medical Director · Last reviewed November 7, 2026

If you have been taking oxycodone, hydrocodone, codeine, morphine or another prescription opioid every day for a while, your body has learned to expect it. When a dose is late, a refill falls through or you try to quit, the result can be a wave of aching, sweating, stomach upset, anxiety and sleeplessness that feels like the worst flu of your life. That is opioid withdrawal.

This page focuses on withdrawal from prescription opioids: why it happens, how it differs between immediate-release and extended-release pills, what a realistic timeline looks like, and how a medical team keeps you safe and as comfortable as possible. If your use involves heroin or street pills that may contain fentanyl, our heroin withdrawal guide covers the differences.

Why does opioid withdrawal happen?

Opioids work by attaching to opioid receptors throughout the brain, spinal cord and gut. Taken regularly, they quiet the nervous system: pain signals soften, breathing and digestion slow, and the brain's alarm centers stay muted. To stay in balance, the body pushes back. It turns up its own "alert" signaling and turns down its natural pain-relief chemistry.

When the opioid is suddenly removed, that pushback is no longer opposed. The nervous system swings into overdrive, which is why withdrawal looks like the mirror image of an opioid's effects: instead of constipation there is diarrhea, instead of calm there is agitation, instead of pinpoint pupils there are wide ones. This is physical dependence, and it can develop in anyone who takes opioids daily for weeks, including people who never took a pill more than prescribed.

Dependence alone is not the same as addiction. Opioid use disorder adds cravings, loss of control and continued use despite harm. Many people who go through withdrawal have both, and some have only dependence. Either way, the withdrawal itself is managed the same careful way. For a fuller look at how dependence turns into addiction, see our prescription opioid addiction overview.

What are the symptoms of opioid withdrawal?

Symptoms tend to arrive in a predictable order, from mild early signs to a harder middle stretch.

When the original pain comes back

A feature specific to prescription opioids is the return of the pain the medication was treating, often feeling worse than before. During withdrawal, the body's pain sensitivity is temporarily turned up, so a sore back or old injury can flare. This is one of the most common reasons people restart pills. A medical team can treat pain during detox with non-opioid approaches and plan for longer-term pain care so you are not left choosing between pain and withdrawal.

How long does opioid withdrawal last?

Timing depends mostly on how long the opioid stays active in your body. Immediate-release pills such as Percocet, Norco or plain oxycodone wear off within hours, so withdrawal arrives quickly. Extended-release tablets and long-acting opioids clear slowly, so symptoms start later, build more gradually and linger longer. The timeline below reflects a typical short-acting prescription opioid.

1. Hours 6–12Early signs

   Restlessness, yawning, runny nose, watery eyes, sweating and a growing sense of unease. Cravings begin.

2. Hours 12–36Building

   Muscle aches, goosebumps, chills, stomach cramps and trouble sleeping. Anxiety and irritability climb.

3. Hours 36–72Peak

   The hardest stretch: nausea, vomiting, diarrhea, intense body aches and strong cravings. Dehydration risk is highest here.

4. Days 4–7Easing

   Physical symptoms gradually settle. Fatigue, poor appetite and broken sleep are common.

5. Weeks 2+Lingering effects

   Low energy, sleep problems, low mood and cravings can continue for weeks or months.

Everyone's course is different. Your physician will assess where you are on this curve and adjust care as symptoms change.

What makes opioid withdrawal worse?

• Dose and duration. Higher daily amounts taken over longer periods usually mean stronger withdrawal.
• The specific medication. Long-acting and extended-release opioids produce a slower but more drawn-out withdrawal.
• How pills were taken. Crushing, snorting or chewing tablets delivers the drug faster and tends to deepen dependence.
• Other substances. Alcohol or benzodiazepines in the picture can complicate withdrawal, and benzodiazepine withdrawal can be dangerous on its own. Tell your care team about everything you use; see our benzodiazepine guide.
• Physical and mental health. Chronic pain, heart or stomach problems, depression, anxiety and PTSD can all make symptoms feel heavier. Our dual-diagnosis care treats these alongside withdrawal.
• Uncertain pill sources. If some pills came from friends, online or the street, they may not be what they seemed. Counterfeit tablets can contain fentanyl, which can change how withdrawal unfolds.

Should you taper or stop pain pills all at once?

If you were prescribed opioids for pain and want to come off, the safest first conversation is usually with your prescriber. The CDC's guidance for clinicians cautions against stopping long-term opioid therapy abruptly, because sudden discontinuation can trigger withdrawal, uncontrolled pain, and in some people a turn toward illicit opioids. A gradual, planned reduction lets the body adjust more gently.

A taper is not always enough. If you are taking more than prescribed, running out early, using pills from other sources, or have tried to cut down and could not, a structured outpatient taper may be hard to hold. That is when medical detox, where every dose decision is made and monitored by a medical team, can be the more realistic option.

Is opioid withdrawal dangerous?

For most healthy adults, opioid withdrawal is not life-threatening in itself. It is, however, more than unpleasant. Repeated vomiting and diarrhea can cause dehydration and electrolyte imbalances, which can be serious, especially for older adults and people with heart, kidney or other medical conditions. Withdrawal during pregnancy needs specialized medical care, as stopping suddenly can be risky for both parent and baby.

The biggest danger comes after withdrawal. Within days of stopping, tolerance drops. A dose that once felt ordinary can now stop your breathing, and a pill that looks like oxycodone may be counterfeit and contain fentanyl.

How does medical detox manage opioid withdrawal?

Medical detox replaces guesswork with a team. At Reggie's inpatient detox on our Sun Valley hilltop campus, care begins with an assessment that includes bloodwork, vital signs and a mental-health screening. Nurses are on site 24/7, a physician is on call, and withdrawal is managed with comfort medications and tapering protocols chosen for your situation.

• Symptom relief: medications for nausea, diarrhea, aches, anxiety and sleep, plus fluids and nutrition from chef-prepared meals.
• Medication-assisted treatment: for many people, buprenorphine (Suboxone) eases withdrawal and cravings once mild to moderate symptoms have begun. Naltrexone may be considered later, after opioids have fully cleared. Reggie's does not offer methadone. Learn more on our MAT page.
• Pain planning: non-opioid strategies for the pain that brought many people to opioids in the first place.
• Comfort and rest: a private suite with a spa-style bathroom and mountain views, light counseling once you are stable, and family updates with your consent.

Detox typically lasts 5 to 10 days. For the steps from first call to admission, see our opioid detox in Los Angeles page.

What is post-acute withdrawal?

After the acute week, many people expect to feel normal and are discouraged when they do not. Lingering symptoms, sometimes called post-acute withdrawal, can include poor sleep, low energy, flat mood, anxiety, trouble concentrating and cravings that arrive without warning. They usually come in waves and gradually fade over weeks to months as the brain recalibrates.

These symptoms are a common reason for relapse, which is why the period after detox matters so much. Continuing medication, therapy and a structured routine helps carry you through. Sleep, regular meals, movement and honest check-ins with your care team all make a difference.

Why not withdraw alone at home?

People try home withdrawal for understandable reasons: privacy, work, fear of being judged. But going "cold turkey" alone has real drawbacks. Symptoms peak when your judgment is most strained, there is no one to treat dehydration or watch for complications, and relief is one phone call or pill away. Many people who try alone end up using again before day three, often after their tolerance has already started to fall.

Medical detox is not a sign of weakness. It is the safer, more comfortable way to do something hard. Treatment is confidential under HIPAA and 42 CFR Part 2, your employer is not notified, and our team can help with FMLA paperwork.

What comes after opioid withdrawal?

Withdrawal is the beginning of treatment, not the end of it. After detox, many people move directly into residential treatment on the same Sun Valley campus for 30 to 90 days, then step down to PHP and IOP at Reggie's Treatment Center and, if helpful, sober living. Medication, therapy such as CBT and relapse prevention, and pain planning carry forward through each step.

Wondering whether your own use has crossed a line? Read the signs of opioid addiction or take our anonymous Self-Check.