Opioid Withdrawal & Medication-Assisted Detox in NJ

The short version

Opioid withdrawal feels like it could kill you. It almost never does. What comes after it can.

MedlinePlus calls opioid withdrawal very uncomfortable but not life threatening, and calls a return to use its biggest complication: withdrawal lowers tolerance, so someone who has just detoxed can overdose on a much smaller dose than before. A large review of cohort studies found that the weeks right after people leave opioid agonist treatment carry sharply higher death rates than the time on it (Sordo et al., BMJ 2017). The same pattern shows up after release from prison (Binswanger et al., NEJM 2007).

That is why opioid detox is built around medication you keep, not medication you finish. ASAM’s practice guideline says withdrawal management on its own, without ongoing treatment, is not a treatment for opioid use disorder and is not recommended.

What opioid withdrawal feels like

Symptoms mimic a severe flu with heightened anxiety: muscle aches, gastrointestinal distress, restlessness, chills, insomnia, and profound cravings. MedlinePlus lists the early symptoms as agitation, anxiety, muscle aches, tearing, runny nose, sweating, yawning and insomnia, and the later ones as cramping, diarrhea, dilated pupils, goosebumps, nausea and vomiting.

Onset depends on the drug. MedlinePlus says symptoms usually start within 12 hours of the last heroin use and within 30 hours of the last methadone exposure; with regular fentanyl use the timing is less predictable (see below). SAMHSA’s TIP 63 puts acute withdrawal at about 7 to 10 days for short-acting opioids and 14 days or more for long-acting ones such as methadone. Sleep problems and low mood can last much longer.

The main medical risk inside withdrawal is fluid loss. MedlinePlus notes that vomiting and diarrhea can cause dehydration and mineral imbalances, and vomiting that will not stop can dehydrate someone fast, which matters more in older people and anyone with heart or kidney problems. Someone who cannot keep fluids down needs medical care the same day, and vomiting that will not stop is a reason to call 911.

What fentanyl changed

The CDC says fentanyl is 50 to 100 times more potent than morphine, that it can be mixed with drugs like heroin, cocaine and methamphetamine, and that illegally made fentanyl is increasingly pressed into counterfeit pills. CDC also notes that many people might be unaware their drugs contain it.

That matters for detox in three ways.

• The timing is less predictable. With regular heavy use, fentanyl clears far more slowly than its short high suggests: a small study of 12 patients entering treatment found an average of about a week to a negative urine screen.
• Starting buprenorphine takes more care. 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.
• Other drugs ride along. Tell the detox team if xylazine or medetomidine may be involved. Withdrawal from those animal sedatives is a separate problem from opioid withdrawal and is managed differently, and naloxone does not reverse them, though it should still be given in an overdose.

Starting buprenorphine

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. That opened the door well beyond detox units: a primary care doctor, a hospital clinic or an emergency department can start it.

Buprenorphine is a partial opioid agonist that binds tightly to opioid receptors. Taken while a full opioid is still on those receptors, it can knock it off and cause sudden, severe withdrawal, called precipitated withdrawal. Programs prevent it in a few established ways:

• Wait for objective withdrawal. Staff score withdrawal on a structured scale, usually the Clinical Opiate Withdrawal Scale (COWS), and give the first dose only when the score shows clear withdrawal.
• Low-dose starts. Also called micro-induction. Tiny doses are stepped up over several days while the full opioid is still on board, so no single dose displaces enough of it to cause a crash. ASAM’s 2023 clinical considerations describe low-dose starts as one option, with most of the experience so far in hospitals. Ask whether the program uses them.
• Higher-dose starts in a supervised setting. Some emergency departments start with larger doses once withdrawal is clear.

ASAM’s 2023 clinical considerations for people using fentanyl and similar drugs say buprenorphine starts may need to be individualized, that withdrawal should be managed proactively before and during the start, and that all forms of opioid agonist treatment should be offered. The practical test for a program is one question: how do you start buprenorphine for someone who has been using fentanyl daily? A specific answer is a good sign. Vague reassurance is not.

Which buprenorphine product follows induction is a separate decision; our Suboxone vs Subutex vs Sublocade guide lays out the differences. Do not attempt a first buprenorphine start alone after fentanyl without talking to a prescriber.

Buprenorphine started in the emergency room

The ER is a legitimate way into opioid treatment, not only a place for overdoses. In a Yale randomized trial published in 2015, 78 percent of patients started on buprenorphine in the emergency department were in treatment 30 days later, against 37 percent of those given only a referral (D’Onofrio et al., JAMA 2015).

Some New Jersey emergency departments start it, and participating hospitals connect patients treated for an opioid overdose with peer recovery specialists through the state’s Opioid Overdose Recovery Program. Federal rules also let a practitioner dispense (though not prescribe) up to a three-day supply of medication to start treatment while a referral is arranged (21 CFR 1306.07(b), as amended in 2023). Ask for both at the visit: a first dose, and a named place to go next.

If a detox bed is not open today, buprenorphine started in an ER or by an outpatient prescriber can bridge you until one is. The guide to getting into detox covers what to ask.

Methadone at opioid treatment programs

For ongoing treatment, 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. A pharmacy cannot fill methadone for addiction, and a regular doctor cannot prescribe it for that purpose. SAMHSA’s Opioid Treatment Program Directory and FindTreatment.gov list New Jersey OTPs.

Methadone is a full agonist, so it does not cause precipitated withdrawal, and ASAM’s 2023 clinical considerations say people using fentanyl should be offered all forms of opioid agonist treatment. That makes methadone an option when a buprenorphine start is hard. It starts low and goes up gradually, because the first weeks carry their own risk: the same review of cohort studies found death rates higher in the first four weeks on methadone than later in treatment (Sordo et al., BMJ 2017).

The federal rules for OTPs, 42 CFR Part 8, were rewritten in 2024. Admission now rests on a clinician’s individual assessment rather than a required one-year history of addiction. Take-home doses depend on clinical judgment and time in treatment: in the first 14 days, a clinician can allow up to 7 days of take-homes for someone judged able to manage them safely. Ask the program how often you would need to come in at first.

For most NJ FamilyCare members, the state still pays opioid treatment programs directly, so ask the program, not the health plan, about methadone. Opioid treatment programs are scheduled to move into the health plans in January 2027.

Inpatient, outpatient, or neither

Many people with opioid use disorder do not need a detox bed. They need buprenorphine or methadone started this week and kept going. Outpatient opioid withdrawal management is common, and several New Jersey outpatient programs treat opioid withdrawal only. Our outpatient detox guide covers who fits.

A bed makes more sense when:

• Alcohol, benzodiazepines or other sedatives are also in the picture
• Xylazine or medetomidine exposure is likely
• There is serious medical or psychiatric illness, or pregnancy
• Home is not a safe place to go through withdrawal
• Outpatient starts have failed before

If you are pregnant, say so on the first call. ASAM’s practice guideline recommends methadone or buprenorphine rather than withdrawal management for pregnant patients who are physically dependent on opioids.

Where to go for opioid detox in New Jersey

Our statewide list has 47 licensed detox programs. 32 of them list opioids among the withdrawals they treat, in SAMHSA’s FindTreatment.gov or on their own website. Those 32 are below, grouped by setting, then by county. Another 14 list no substances in the sources we checked, so they are not shown here. Some of them may treat opioid withdrawal too. Call and ask, or see the full list of licensed detox programs in New Jersey. Methadone clinics that hold no withdrawal management license are not in this list.

Hospital detox units (4)

Inpatient (residential) detox programs (23)

Outpatient (ambulatory) detox programs (5)

Before you pick one, ask how it starts buprenorphine after fentanyl, whether it offers methadone or works with an OTP, whether it will continue medication you already take, and who will keep prescribing after you leave. Our guide to choosing a facility has ten questions to ask.

Who pays

Commercial insurance

Fully insured New Jersey plans and the State Health Benefits and School Employees’ plans cannot require prior authorization for the first 180 days per plan year of in-network treatment your own physician, psychologist or psychiatrist finds medically necessary. Self-funded employer plans, Medicare and Medicaid are not covered by that rule. The same law, P.L.2017, c.28, also bars fully insured New Jersey plans and the State Health Benefits and School Employees’ plans from requiring prior authorization during the first 180 days of each plan year for outpatient prescription drugs that treat substance use disorder, buprenorphine included, when your own physician, psychologist or psychiatrist finds them medically necessary.

NJ FamilyCare (Medicaid)

NJ FamilyCare covers buprenorphine, methadone, and naltrexone. It stopped requiring prior authorization for opioid use disorder medication on April 1, 2019, though brand-name and injectable forms may still need approval. Outpatient and hospital detox go through your health plan. Residential detox is authorized through the IME Addictions Access Center at 1-844-276-2777 for most members. Our NJ FamilyCare guide has the plan-by-plan detail.

No insurance

Call the IME at 1-844-276-2777, 24/7. Its financial screening checks whether you can get state-funded treatment. Our detox cost guide covers each way to pay, including hospital Charity Care.

The first month after detox

This is the stretch with the highest overdose risk, because tolerance is down and craving is not. Plan it before discharge day, not after.

• Leave on medication if you can. In a 2018 Massachusetts cohort study, buprenorphine and methadone after a nonfatal overdose were associated with lower opioid-related mortality (Larochelle et al., Ann Intern Med 2018).
• Leave with an appointment, not a phone number. The first prescriber visit should be on the calendar before you walk out, with enough medication to reach it.
• Leave with naloxone, and tell someone where it is. You cannot give it to yourself.
• Do not use alone. If a return to use happens, a smaller amount than before can stop your breathing, and fentanyl makes the amount impossible to judge.

Our guide to what comes after detox covers the levels of care that can follow.

Naloxone (Narcan) access

Naloxone is sold over the counter in New Jersey pharmacies. It is available at no cost at pharmacies participating in the state’s Naloxone365 program, and at no cost 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. For the medications themselves, see the medication guide, and the National Academies report Medications for Opioid Use Disorder Save Lives for the evidence.