What Is Medical Detox? What Happens There and What Comes Next

When a loved one finally agrees to detox, the relief is real. The harder part tends to come later, in the days right after discharge, because detox by itself does little to change long-term drug or alcohol use.¹

What does medical detox actually do?

On admission, a clinician asks what your loved one uses, how much, when they last used, and whether past withdrawals caused seizures or delirium tremens (DTs). Staff then score symptoms with rating scales such as the CIWA-Ar for alcohol and track how they change, along with vital signs, hydration, sleep and mood, including thoughts of suicide.²

Medication does much of the work. For moderate to severe alcohol withdrawal, benzodiazepines are the first-line medicine; gabapentin or carbamazepine may be used instead for milder symptoms, or alongside them.² For opioids, buprenorphine or methadone can ease withdrawal.⁶ The prescriber chooses the drug and dose.

A good detox also talks about ongoing treatment from day one. NIDA says patients should be encouraged to keep going after detox, and that motivation work begun at intake can improve engagement.¹

Does my loved one need medical detox?

Not everyone does, and only a clinician can decide. Supervised withdrawal matters most for people who drink heavily every day, take benzodiazepines or other sedatives regularly, have had withdrawal seizures or DTs before, or use several substances.² If that sounds like your loved one, they should see a doctor before stopping; our page on whether it’s safe for them to stop at home explains why.

A full substance use assessment decides the setting and what follows. See how a clinical assessment sets the level of care.

Is detox inpatient or outpatient?

It can be either. In the current ASAM Criteria, the most widely used placement standards, withdrawal care is built into several levels of care rather than run as a separate track.³

Quitting at home without a clinician is not outpatient detox. What makes it outpatient detox is the medical plan and the daily contact.

How long does detox take?

Usually days, not weeks. It depends on the substance, how much and how long your loved one has used, and their health.

• Alcohol: symptoms usually begin 6 to 24 hours after the last drink. Seizures are most likely in the first two days, and DTs, if they happen, usually start on day three or four.² See the alcohol withdrawal timeline.
• Short-acting opioids such as heroin: withdrawal usually starts within 12 hours, peaks within 24 to 48 hours and lasts 3 to 5 days. Methadone withdrawal starts later, within about 30 hours, and can last up to 10 days.⁵
• Benzodiazepines: for anyone who has taken them for more than a month, the dose comes down gradually under a clinician’s supervision, so this takes longer.⁸ See benzodiazepine withdrawal and tapering.

Treatment, by contrast, is measured in months. NIDA’s research summary says most people need at least three months in treatment to significantly reduce or stop their use, and longer tends to work better.¹

Is opioid detox different?

Yes. With opioids the main danger often comes after detox. Withdrawal lowers tolerance, so going back to the old amount can stop someone’s breathing. SAMHSA’s guidance says supervised withdrawal alone is often followed by a return to use, and that methadone and buprenorphine are linked to a lower risk of overdose death than no medication.⁶ That’s why many people with opioid use disorder go to detox to start buprenorphine or methadone, not to come off all opioids and leave.⁶

The question to ask an opioid detox is: will you start buprenorphine or methadone, and who continues it after discharge? Learn more about medications for addiction.

If your loved one uses street fentanyl, tell the medical team. In April 2026 the CDC warned that medetomidine, a veterinary sedative now mixed into illegal fentanyl, can cause a severe withdrawal that standard opioid withdrawal treatment may not control and that may need hospital or intensive care.⁷

What happens after detox?

The next level of care, chosen by a clinical assessment, should start right away. That might be residential treatment, a day or evening program while living at home, or outpatient counseling with medication. Three medications are approved in the U.S. for alcohol use disorder (naltrexone, acamprosate and disulfiram),¹² and the FDA has approved buprenorphine, methadone and naltrexone for opioid use disorder.⁴ Our overview of levels of care explains each option.

A detox that only says “call us if you need anything” at discharge hasn’t finished its job.

How do we find a detox program we can trust?

Skip the ads and call centers. Start with your loved one’s doctor or the behavioral health number on their insurance card. FindTreatment.gov, run by SAMHSA, lists state-licensed providers who specialize in substance use disorders,⁹ and the SAMHSA National Helpline at 1-800-662-4357 gives free, confidential referrals 24 hours a day.¹⁰

Be wary of anyone who offers free travel, says a program “takes all insurance” before checking, or pushes you to commit on the first call. Our guide on how to find and vet a treatment program walks through the checks. On the admissions call, ask these questions, starting with the first one.

Does insurance cover detox?

Often, at least in part. Marketplace plans must cover substance use disorder treatment as an essential health benefit.¹¹ Job-based plans from employers with more than 50 employees that cover addiction treatment must follow the federal parity law, which generally bars making that coverage more restrictive than medical coverage.¹³ Medicare covers medication and counseling for opioid use disorder.¹⁴ Medicaid benefits vary by state.

Before admission, call the plan and ask whether “withdrawal management” is covered at the setting the clinician recommends, which facilities are in network, and whether prior approval is needed. A program’s own benefits check is not a promise of payment; see what a benefits check can and can’t tell you.