Precipitated Withdrawal: Suboxone, Naloxone and Kratom/7-OH

Published by Joseph, EditorCompiled from cited sources · not yet medically reviewedUpdated Oct 29, 202612 sources

Need help now? SAMHSA’s National Helpline is free, confidential and open 24/7 in English and Spanish: 1-800-662-4357. In a mental health crisis, call or text 988. In an emergency, call 911.

For information only, not medical advice. Talk to a doctor before stopping or changing any medication. Medical disclaimer

⚠ Medical warning

Precipitated withdrawal comes on fast and can be severe. If someone has just been given naloxone (Narcan) for an overdose, call 911 and stay with them: they can stop breathing again. If it starts after a first dose of buprenorphine (Suboxone) or naltrexone, contact the prescriber, clinic or an emergency department now. Don’t try to push through it by taking more opioids: SAMHSA warns that trying to override naltrexone’s blockade with high opioid doses may cause overdose.

Quick answer

Precipitated withdrawal is opioid withdrawal that’s triggered suddenly by a medicine, instead of building up slowly after the last dose. It happens when a drug that binds opioid receptors more strongly pushes opioids off them. The usual triggers are buprenorphine (in Suboxone and similar products) taken too soon after other opioids, naltrexone (Vivitrol and tablets), and naloxone (Narcan) given for an overdose.

After a first buprenorphine dose it typically starts within 1 to 2 hours and may settle over the next 6 to 24 hours, but it can last longer, especially after methadone or fentanyl. It feels like ordinary opioid withdrawal turned up fast: vomiting, diarrhea, cramps, aches, sweating and anxiety. In a large 2023 emergency department trial, it was uncommon (under 1%), even though about 70% of people used fentanyl. Case reports show it can also happen with kratom and 7-OH.

Precipitated withdrawal timeline at a glance

When did you last use or take it?

⚠ Medical warning (read before using this)

This places the typical ranges from this article's sources on your date. It is not a prediction or a diagnosis, and being past a phase does not mean symptoms or risks are over.

A rough guide from published sources, not medical advice. Everyone is different.

Phase	When	What you may feel	Severity	Red flags
Sudden onset	Within 1 to 2 hours of a first buprenorphine dose; soon after naloxone or naltrexone	A rapid start, or sharp worsening, of opioid withdrawal; Body aches, abdominal cramps; Nausea, vomiting, diarrhea; Runny nose, yawning, dilated pupils; Sweating, goose bumps, restlessness, anxiety	Severe	After naloxone for an overdose: call 911 and stay with the person, even if they wake up; Repeated vomiting or diarrhea and you can’t keep fluids down: get medical help
Easing	Often settles over the next 6 to 24 hours	Symptoms gradually ease; Clinicians may treat it with symptom medicines or, after buprenorphine, more buprenorphine; Exhaustion and strong cravings	Severe	Taking extra opioids to stop the symptoms: overdose risk; Thoughts of suicide or self-harm: call or text 988 now
Longer course (some people)	Can last longer than a day, especially after methadone or fentanyl	Ongoing withdrawal symptoms; Cravings and low mood	Moderate	Symptoms not easing after a day: contact your prescriber or clinic

Print a daily symptom log for this timeline · My quit tracker

Symptoms, phase by phase

Precipitated withdrawal has the same symptoms as ordinary opioid withdrawal, but they appear quickly and can be intense. The Maryland Addiction Consultation Service describes aches, nausea and vomiting, diarrhea, abdominal cramps, dilated pupils, runny nose and yawning, with a rapid onset or sharp worsening within 1 to 2 hours of the first buprenorphine dose. MedlinePlus lists similar withdrawal signs after naloxone, including body aches, diarrhea, fast heartbeat, fever, sweating, nausea, vomiting, restlessness, shivering and stomach cramps, and says to get emergency treatment for them.

Sudden onset: Within 1 to 2 hours of a first buprenorphine dose; soon after naloxone or naltrexone

A rapid start, or sharp worsening, of opioid withdrawal
Body aches, abdominal cramps
Nausea, vomiting, diarrhea
Runny nose, yawning, dilated pupils
Sweating, goose bumps, restlessness, anxiety

Easing: Often settles over the next 6 to 24 hours

Symptoms gradually ease
Clinicians may treat it with symptom medicines or, after buprenorphine, more buprenorphine
Exhaustion and strong cravings

Longer course (some people): Can last longer than a day, especially after methadone or fentanyl

Ongoing withdrawal symptoms
Cravings and low mood

What triggers it

Trigger	Why it happens	What the sources say about timing
Buprenorphine (Suboxone, Zubsolv, Subutex and generics)	A partial opioid agonist that binds receptors more strongly than full opioids, so it can push them off and replace a strong effect with a weaker one	SAMHSA TIP 63: the longer since the last full-opioid dose, the lower the risk; clinicians usually start it once clear withdrawal signs appear, at least 12 hours after heroin or short-acting pills, and at least 24 hours (ideally 36 or more) after methadone
Naltrexone (Vivitrol injection, tablets)	An opioid blocker that displaces other opioids	TIP 63: people usually wait 7 to 10 days after short-acting opioids and 10 to 14 days after long-acting ones. Symptoms can be severe enough for hospitalization
Naloxone (Narcan and other overdose-reversal products)	An opioid blocker given to reverse an overdose	Withdrawal can follow reversal. The person needs emergency care: MedlinePlus says to give another dose if they respond and then relapse
Injecting Suboxone	Naloxone in Suboxone is barely absorbed under the tongue but is active if injected	The Suboxone label says injecting it is likely to cause withdrawal in people dependent on full opioids

Fentanyl, methadone and long-acting opioids

The Suboxone label says people on methadone or other long-acting opioids may be more prone to precipitated and prolonged withdrawal when starting buprenorphine. The MACS fact sheet notes the risk may persist for several days after the last use of long-acting opioids such as methadone or fentanyl. Even so, the 2023 NIDA-funded emergency department trial of 1,200 people found precipitated withdrawal in only 9 (0.76%), similar to rates seen with heroin or prescription opioids. It defined precipitated withdrawal as a jump of 5 points or more on the Clinical Opiate Withdrawal Scale within 2 hours of starting buprenorphine.

Kratom and 7-OH

Kratom and concentrated 7-hydroxymitragynine (7-OH) act on opioid receptors, so the same thing can happen. Published case reports describe precipitated withdrawal when naltrexone was given to people whose kratom use wasn’t known to their care team. A 2026 case report described a man taking about 1,000 mg of 7-OH a day whose withdrawal scores rose after small buprenorphine-naloxone doses and only improved after a higher dose; the authors stressed asking specifically about “seven-o”. On the other hand, a 2026 series of nine people using 7-OH who started buprenorphine at a telehealth clinic reported no precipitated withdrawal. Evidence is limited to case reports and small series, so 7-OH is not well studied. Tell your care team about any kratom or 7-OH use before starting buprenorphine or naltrexone. See our Kratom and 7-OH withdrawal timeline.

What changes the risk

Time since the last full opioid. TIP 63 says the longer it’s been, the lower the risk.
How much withdrawal is already present. Starting buprenorphine once clear withdrawal signs appear lowers the risk, according to TIP 63 and the Suboxone label.
Level of physical dependence. TIP 63 says the higher the level of dependence, the higher the chance.
Buprenorphine dose. TIP 63 says smaller first doses are less likely to precipitate withdrawal, and some clinicians use low-dose starting methods. Your prescriber chooses the approach.
Long-acting opioids. Methadone, fentanyl and other long-acting opioids raise the risk of precipitated and prolonged withdrawal, per the Suboxone label and MACS.
Liver problems. The Suboxone label says reduced liver function raises naloxone levels and the risk of precipitated withdrawal when starting a combination product.

When to see a doctor or get help now

Call 911 after giving naloxone for a suspected overdose, and stay with the person until help arrives.
Contact the prescriber, clinic or an emergency department if withdrawal suddenly gets worse after a first dose of buprenorphine or naltrexone.
Get medical help for repeated vomiting or diarrhea, or if you can’t keep fluids down.
Call or text 988 for thoughts of suicide or self-harm.
Free, confidential treatment referrals: SAMHSA’s helpline at 1-800-662-4357, 24/7. See Get Help.

How it’s treated

NIDA says the best treatment is prevention: starting buprenorphine once someone is in moderate to severe withdrawal. Care is supportive and depends on the opioid involved, how recently it was used and the buprenorphine dose. Clinicians may use non-opioid medicines for symptoms (NIDA lists clonidine, lofexidine, anti-nausea medicines and anti-inflammatories), and NIDA notes that additional buprenorphine has been reported to treat it effectively. The MACS fact sheet also recommends extra buprenorphine doses and suggests making sure people starting at home have enough. These are clinical decisions. We don’t publish dosing instructions, and you shouldn’t build your own plan. If you’re starting at home, agree with your prescriber in advance what to do if withdrawal suddenly gets worse.

Tips for getting through it

Before starting buprenorphine or naltrexone, tell your prescriber exactly what you’ve used and when, including fentanyl, methadone, kratom and 7-OH
Ask your prescriber which starting method they recommend and what to do if symptoms suddenly worsen
Have water or electrolyte drinks ready, and someone who can check on you
Keep naloxone at home and make sure people around you know how to use it
Remember that it often settles within a day. TIP 63 warns that stopping buprenorphine raises the risk of overdose death if opioid use returns, so talk to your prescriber before giving up on treatment

Frequently asked questions

How long does precipitated withdrawal last?

After a first buprenorphine dose, the MACS fact sheet says symptoms may subside over 6 to 24 hours but can last longer. The risk of prolonged withdrawal is higher after methadone or other long-acting opioids, according to the Suboxone label.

How long should you wait before taking Suboxone?

Your prescriber should decide this. SAMHSA’s TIP 63 describes clinicians starting buprenorphine once clear withdrawal signs appear, typically at least 12 hours after heroin or short-acting opioid pills and at least 24 hours (ideally 36 or more) after methadone. For fentanyl, the MACS fact sheet notes the risk may persist for several days after last use.

Can naloxone (Narcan) cause withdrawal?

Yes. Naloxone reverses an overdose by blocking opioids, which can trigger withdrawal in someone who is dependent. MedlinePlus lists withdrawal signs as a serious side effect needing emergency treatment. Always call 911 after using naloxone.

Does precipitated withdrawal happen with fentanyl?

It can, but a large emergency department trial found it in fewer than 1% of people starting buprenorphine, even though about 70% used fentanyl.

Can kratom or 7-OH cause precipitated withdrawal?

Case reports describe it after naltrexone in people using kratom, and one 2026 case described worsening withdrawal after small buprenorphine doses in someone taking high-dose 7-OH. Evidence is limited. Tell your care team about kratom or 7-OH use.

Next steps

Talk to others going through it. Share your experience or ask questions on the Opioids & Kratom board in our community forum. Planning to stop? See the Tapering & Talking to Your Doctor board, and talk to a doctor before you stop. Forum posts are personal experiences, not medical advice. Please read the community guidelines.

Sources

Last reviewed: October 29, 2026. Researched and written by Withdrawal Timelines from the cited sources. This article has not yet been reviewed by a medical professional. See How We Review and our Medical Disclaimer. This is general information, not medical advice.

More timelines

View all