How long does opioid detox take?

Acute withdrawal lasts 5 to 10 days for short-acting opioids and 2 to 3 weeks for methadone. Post-acute symptoms (sleep disruption, low mood) may persist for months and are best managed with continued MAT.

Do I have to stay on Suboxone forever?

No. Duration is individualized. ASAM's practice guideline sets no minimum or maximum: treatment continues as long as it is helping, and many people benefit from years of maintenance. Tapering should be planned with a prescriber.

Is medication-assisted treatment covered in NJ?

Yes. NJ FamilyCare covers buprenorphine, methadone, and naltrexone, and New Jersey's 2017 law bars state-regulated commercial plans from requiring prior authorization for these medications. Self-funded employer plans are exempt from the state law, so confirm with your plan.

Detox Guide

Opioid Withdrawal & Medication-Assisted Detox in NJ

Opioid withdrawal is rarely fatal by itself, but the days after it are the highest-risk window for fatal overdose, because tolerance falls while craving does not. Medication for opioid use disorder is the current standard of care.

Updated September 2026 · Published by DetoxNJ.com

Timeline

Opioid withdrawal: a typical course (short-acting opioids, including fentanyl)

8–24 h: Anxiety, yawning, sweating, runny nose, aches. Fentanyl onset is often later and less predictable.
24–72 h: Peak: vomiting, diarrhea, cramps, insomnia, intense craving
Days 4–7: Physical symptoms subside; sleep and appetite return slowly
Days 7–14: Mostly resolved; craving and low mood continue
Weeks–months: Post-acute symptoms. Tolerance is gone: overdose risk after a return to use is at its highest.

Opioid withdrawal is rarely life-threatening but peaks hard around day two or three. Medication for opioid use disorder, started in early withdrawal, shortens and softens the whole curve. Individual courses vary with dose, duration, other substances, and health; this is a guide, not a prediction.

What opioid withdrawal feels like

Symptoms mimic a severe flu with heightened anxiety: muscle aches, gastrointestinal distress, restlessness, chills, insomnia, and profound cravings. Onset depends on the substance — 8–12 hours for short-acting opioids (heroin, oxycodone, fentanyl) and 30–48 hours for methadone.

Buprenorphine and methadone in New Jersey

Buprenorphine (Suboxone, Sublocade) can be prescribed by any New Jersey practitioner whose DEA registration covers Schedule III following the 2023 removal of the X-waiver. Methadone for opioid use disorder is dispensed only at licensed Opioid Treatment Programs (OTPs), which operate across the state; SAMHSA’s treatment locator lists them by county.

Fentanyl considerations

Clinicians report that precipitated withdrawal during buprenorphine induction is more of a concern with fentanyl than with heroin, possibly because fentanyl lingers in body tissue; the mechanism is still being studied. Many NJ programs now use low-dose or micro-induction protocols to minimize this risk. Which buprenorphine product follows induction is a separate decision; our Suboxone vs Subutex vs Sublocade guide lays out the differences.

Naloxone (Narcan) access

Naloxone is sold over the counter in New Jersey pharmacies, is free at pharmacies participating in the state’s Naloxone365 program, and is free through many county health departments; call ahead if a location is out of stock. Anyone leaving detox — and their household — should carry it.

Identifying opioid pills

If you have found a pill and need to know what it is, our guide to the T 257 pill (hydrocodone 5/325) explains how imprints work and why no pill from outside a pharmacy can be trusted. For the codeine cough syrup mixture, see what a lean gut says about opioid use.

Two companion reads: what precipitated withdrawal is and how programs avoid it after fentanyl, and the naloxone guide for families for the highest-risk days right after detox.

Frequently asked

How long does opioid detox take?: Acute withdrawal lasts 5 to 10 days for short-acting opioids and 2 to 3 weeks for methadone. Post-acute symptoms (sleep disruption, low mood) may persist for months and are best managed with continued MAT.
Do I have to stay on Suboxone forever?: No. Duration is individualized. ASAM's practice guideline sets no minimum or maximum: treatment continues as long as it is helping, and many people benefit from years of maintenance. Tapering should be planned with a prescriber.
Is medication-assisted treatment covered in NJ?: Yes. NJ FamilyCare covers buprenorphine, methadone, and naltrexone, and New Jersey's 2017 law bars state-regulated commercial plans from requiring prior authorization for these medications. Self-funded employer plans are exempt from the state law, so confirm with your plan.

Sources

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