Detox Timeline Calculator: How Long Does Detox Take?

How Long Does Addiction Detox Take?

Most medically supervised detox takes 3 to 10 days, though the honest range runs wider than that. Alcohol detox typically takes 5 to 7 days. Short-acting opioids clear in 5 to 7 days, fentanyl in 7 to 14. Benzodiazepines are the outlier: they are tapered rather than stopped, and that taper is measured in weeks. The substance sets the timeline far more than the person does.

The tool above maps that timeline hour by hour for 20 substances. This guide explains the pattern behind those numbers: what happens at each stage of withdrawal, which substances are dangerous to stop without medical supervision, why some people take twice as long as others, and what happens once detox is finished. The table below shows the typical windows for the substances we see most often.

These are typical windows for regular, sustained use. Heavier or longer-term use pushes every figure toward the far end, and the tool above adjusts for that. Withdrawal is individual, and no timeline is a promise.

What Happens During Detox?

Detox is the process of clearing a substance from the body under medical supervision while the withdrawal symptoms are managed. Nearly every withdrawal follows the same three-part shape, whatever the substance.

• Onset. Symptoms begin once blood levels drop far enough. This is governed by the drug’s half-life, which is why alcohol withdrawal starts in hours and methadone withdrawal takes two days to appear.
• Peak. The most intense stretch, and where the medical risk sits. For alcohol this is the 24 to 72 hour window that carries seizure and delirium risk. For opioids it is the 24 to 72 hour stretch of vomiting, cramping and insomnia that ends most attempts made alone.
• Resolution and the tail. Physical symptoms fade over days. Sleep, mood, energy and cravings take considerably longer, and this is the phase people are least prepared for.

In a supervised setting, that shape is managed rather than endured. Withdrawal is scored on validated scales, usually CIWA-Ar for alcohol and COWS for opioids, and medication is adjusted to those scores several times a day. Fluids, electrolytes, nutrition and sleep support run alongside. The aim is not simply to get through it, but to get through it with the person still willing to continue into treatment.

What Determines How Long Detox Takes?

Six factors set the length of a detox, and only the first is about the substance itself:

• Half-life. The single biggest factor. Short-acting drugs produce a fast, sharp withdrawal. Long-acting ones produce a delayed, drawn-out one. Fentanyl is the awkward case, because it stores in body fat and releases slowly even though it acts quickly.
• Dose and duration of use. Years of daily use at a high dose produce a longer and more complicated withdrawal than a few months of occasional use, and the difference is often several days.
• Polysubstance use. When more than one substance is involved, the timeline is set by whichever leaves the body slowest, and the risks stack rather than average out. This is the most common presentation at intake.
• Physical health. Liver and kidney function change how quickly substances and withdrawal medications are metabolised. Cardiac conditions, seizure history and poor nutrition all call for slower, closer management.
• Co-occurring mental health conditions. Depression, anxiety, PTSD and bipolar symptoms intensify during withdrawal and can extend the stabilisation phase. Treating them alongside the withdrawal is the point of dual diagnosis treatment.
• Previous withdrawals. Repeated withdrawal episodes tend to get worse rather than easier, a pattern clinicians call kindling. A prior withdrawal seizure is one of the strongest predictors that the next one will be complicated.

How Long Does Detox Take by Substance?

Each substance produces a distinct withdrawal, with a different level of medical risk attached. Select any of them in the tool above for the full phase-by-phase timeline.

Alcohol Detox Timeline

Symptoms begin 6 to 12 hours after the last drink, peak between 24 and 72 hours and largely resolve within 5 to 7 days. Withdrawal seizures cluster in the 12 to 48 hour window, and delirium tremens, which affects a small minority of people, typically appears between 48 and 96 hours. Alcohol is one of the few withdrawals that can be fatal, which is why medical detox is the standard of care rather than a precaution.

Opioid Detox Timeline

Heroin and short-acting painkillers begin withdrawing at 6 to 12 hours, peak at 24 to 72 hours and clear in 5 to 7 days. Fentanyl starts later, peaks harder and runs 7 to 14 days because it stores in fat tissue. Methadone can take 10 to 20 days, and buprenorphine tails off over 1 to 2 weeks. Opioid withdrawal is rarely fatal in itself, but tolerance falls sharply within days, which makes a return to a previous dose one of the leading causes of fatal overdose. Medication-assisted treatment substantially reduces that risk.

Benzodiazepine Detox Timeline

Short-acting benzodiazepines such as Xanax and Ativan withdraw within 6 to 24 hours; longer-acting ones such as Klonopin and Valium take 24 to 72 hours. The peak falls between days 2 and 7, and the acute phase runs 2 to 4 weeks. Benzodiazepines are never stopped abruptly, because doing so risks seizures and a dangerous rebound state. Detox is a controlled taper, and for some people it continues well past discharge.

Stimulant Detox Timeline

Methamphetamine and cocaine produce a crash within 12 to 24 hours, a peak across days 1 to 3, and an acute phase of 7 to 14 days. The risk here is psychological rather than physical: severe depression, suicidal thinking and, after heavy meth use, lingering paranoia or psychosis. Stimulant detox is monitored psychiatrically as much as medically.

Kratom Detox Timeline

Kratom acts on opioid receptors, so it produces a shorter, milder version of opioid withdrawal. Symptoms begin 6 to 12 hours after the last dose, peak across days 1 to 3, and largely resolve within 3 to 7 days, with low mood and craving waves continuing for another two to four weeks. Typical symptoms are muscle and joint aching, stomach upset, insomnia, restless legs, sweating, hot and cold flashes, irritability and anxiety.

Kratom dependence is consistently underestimated, largely because the product is sold over the counter in gas stations and smoke shops and is widely marketed as a natural alternative. Heavy daily use produces genuine physical dependence, and people who have never used another opioid are often surprised by how physical the withdrawal turns out to be. Extract and concentrate products, which contain far more alkaloid per dose than raw leaf powder, tend to produce a heavier withdrawal again.

Kratom withdrawal is not usually dangerous on its own, but it is managed the same way as an opioid withdrawal: clonidine or lofexidine, anti-nausea and antidiarrhoeal medication, sleep support, and in heavier cases a short course of buprenorphine. Because many people use kratom alongside alcohol or prescription medication, an assessment covers everything being taken rather than kratom alone.

Cannabis and Other Substances

Cannabis withdrawal starts at 24 to 72 hours and resolves over 1 to 3 weeks, dominated by insomnia, vivid dreams, irritability and appetite loss. Synthetic cannabinoids such as K2 and Spice behave nothing like cannabis and can involve agitation, psychosis and seizures. Gabapentin, pregabalin and prescription sleep medication all produce genuine withdrawal and are tapered rather than stopped.

Which Withdrawals Are Dangerous?

Most withdrawals are miserable. A few are medically dangerous, and the distinction matters because it decides whether detoxing outside a clinical setting is merely unpleasant or genuinely risky.

Alcohol, benzodiazepines and barbiturates all act on the same GABA system, and abrupt withdrawal from any of them can cause seizures, delirium and, in severe cases, death. These three require medical supervision without exception. Opioid withdrawal is rarely fatal directly, but vomiting and diarrhoea can cause dangerous dehydration, and the post-detox overdose risk is significant. Stimulant withdrawal carries psychiatric rather than physical danger, principally severe depression and suicidal thinking.

Can You Detox at Home?

For alcohol, benzodiazepines and barbiturates, no. The risk of seizures and delirium is not something that can be monitored or managed at home, and both can develop quickly in someone who seemed stable an hour earlier.

For other substances, an at-home attempt is usually less dangerous but rarely successful. The peak of opioid withdrawal lands between 24 and 72 hours, which is exactly when the substance is easiest to reach and the reasoning for stopping is at its weakest. In a supervised setting that peak is medicated, the option to leave is not immediately available, and someone is present at three in the morning when it matters. That is most of the difference in outcome.

What Medications Are Used in Detox?

Medication in detox does two jobs: it prevents the dangerous parts of withdrawal, and it makes the rest tolerable enough to complete. What is used depends entirely on the substance.

Naltrexone and acamprosate are frequently started before discharge to reduce alcohol cravings, and buprenorphine or naltrexone may continue for months after an opioid detox. Continuing medication is not a failure to complete detox. For opioid use disorder in particular, staying on medication is associated with better outcomes than stopping it.

What Is Post-Acute Withdrawal Syndrome?

Post-acute withdrawal syndrome, or PAWS, is the set of symptoms that continues after the acute phase ends: disrupted sleep, mood swings, low motivation, difficulty concentrating, anhedonia and craving waves. It typically runs for weeks after alcohol or opioid detox, and for months after heavy stimulant use as dopamine systems recover. A minority of people coming off benzodiazepines experience protracted symptoms for considerably longer.

PAWS matters more than its low profile suggests, because it is where most early relapse happens. Someone finishing detox physically well can feel considerably worse three weeks later and conclude, wrongly, that recovery is not working. Knowing the pattern in advance, and being in structured treatment while it plays out, is the practical answer.

What Happens After Detox?

Detox clears the substance. It does not treat the reasons it was being used, and on its own it has a poor track record. The weeks immediately after are the highest-risk period for relapse, and for opioids, the highest-risk period for overdose, because tolerance has fallen.

What works is moving without a gap into the next level of care: residential rehab for those who need distance and structure, PHP or IOP for those able to live at home, and a virtual IOP where work or travel makes attendance difficult. Aftercare and sober living extend that support past the end of the programme. Clinicians commonly recommend 60 to 90 days across the full continuum, and longer stays are consistently associated with better outcomes.

Does Insurance Cover Detox?

Yes. Federal law treats substance use treatment as an essential health benefit, and commercial plans, Marketplace plans and TennCare all cover medically necessary detox. What you pay depends on your deductible, coinsurance and out-of-pocket maximum rather than on whether detox is covered at all. Typical self-pay detox in Tennessee runs $250 to $800 a day, and most insured patients pay a fraction of that. A confidential benefits check gives you a real number faster than any online estimate.

What Does Detox Look Like at APEX Recovery Tennessee?

APEX Recovery runs two Tennessee facilities, in Brentwood and Columbia, serving Nashville, Knoxville, Memphis, Chattanooga and communities across the state. Detox is medically supervised around the clock, with symptom scoring, physician-directed medication protocols and nursing support throughout, and it runs alongside residential, PHP, IOP and virtual IOP so the step into treatment happens without a gap.

APEX Recovery is clinician owned and clinician led, and Joint Commission accredited. Because we provide primary mental health treatment alongside primary drug and alcohol rehab under one clinical team, a co-occurring condition is assessed and treated from day one rather than deferred until after detox. Specialised programming is available for veterans, active-duty service members and first responders.

Complete a 90-day programme with APEX Recovery and, if a relapse occurs within 12 months of discharge, your next stay is at no cost for up to 30 days. Recovery is rarely linear, and a setback should not be the end of it. To find out what your own detox would involve, a confidential assessment takes about 20 minutes and we can verify your insurance benefits at the same time.