Detox typically lasts between 3 and 10 days for most substances, though the exact timeline depends heavily on what you’re detoxing from, how long you’ve been using, and your overall health. Alcohol withdrawal peaks within 1 to 3 days. Opioid withdrawal runs about 5 days for short-acting drugs like heroin. Benzodiazepine detox can stretch from weeks to over a year when tapered safely. Beyond the acute phase, lingering psychological symptoms can persist for months.
Alcohol Detox: 3 to 7 Days
Alcohol withdrawal follows a fairly predictable pattern. Mild symptoms like headache, anxiety, and insomnia show up 6 to 12 hours after your last drink. Hallucinations can develop within 24 hours in more severe cases. For most people with mild to moderate withdrawal, symptoms peak and start improving between 24 and 72 hours.
The serious complications have their own window. Seizure risk is highest 24 to 48 hours after the last drink. Delirium tremens, the most dangerous form of withdrawal, can appear between 48 and 72 hours. People with mild withdrawal and low risk of complications may be monitored for up to 36 hours, after which severe withdrawal is unlikely to develop. The full acute phase generally wraps up within a week, though sleep disturbances and mood changes often linger longer.
Opioid Detox: 5 to 14 Days
How long opioid detox takes depends on whether the drug is short-acting or long-acting. Physical withdrawal from heroin and similar short-acting opioids begins 6 to 12 hours after the last dose and lasts roughly 5 days. The worst of it hits around days 2 and 3, with muscle aches, nausea, sweating, and intense cravings.
Longer-acting opioids like methadone produce a slower onset but a more drawn-out withdrawal. Symptoms may not start for a day or two and can persist for two weeks or more. The total detox window stretches accordingly, which is one reason medical supervision matters for these drugs.
Benzodiazepine Detox: Weeks to Months
Benzodiazepines are in a category of their own. Stopping abruptly after regular use can cause seizures, so detox almost always involves a gradual taper rather than a sudden stop. The recommended taper length scales directly with how long you’ve been taking the medication:
- 2 to 8 weeks of use: at least a 2-week taper
- 8 weeks to 6 months: at least 4 weeks
- 6 months to 1 year: at least 8 weeks
- More than 1 year: 6 to 18 months
Each dose reduction is spaced at least a week apart, and if withdrawal symptoms flare up, the current dose is held steady until they settle. Higher-potency or higher-dose prescriptions require an even slower approach. The process is uncomfortable but manageable when done gradually, and pushing through too fast increases the risk of rebound anxiety and seizures.
Stimulant Detox: 1 to 2 Weeks (With a Long Tail)
Withdrawal from stimulants like methamphetamine or cocaine looks different from alcohol or opioid withdrawal. The initial “crash” phase hits within the first 24 to 72 hours and brings extreme fatigue, increased appetite, depression, and hypersomnia. There’s less physical danger compared to alcohol withdrawal, but the psychological symptoms can be intense.
The acute phase typically resolves within one to two weeks. However, a post-acute phase can stretch from months 2 through 6 or beyond, with persistent low mood, difficulty concentrating, and strong cravings that come and go.
Cannabis: A Different Kind of Detox
Cannabis withdrawal is milder than most other substances, but the drug’s byproducts leave your body slowly. THC is fat-soluble, meaning it binds to fat cells and releases gradually. A single use clears from urine in about 3 days, but chronic heavy use can remain detectable for over 30 days. Hair follicle tests can show evidence of use for up to 90 days.
If you’re a daily or heavy user, physical withdrawal symptoms like irritability, sleep problems, decreased appetite, and mild anxiety typically start within a day or two and peak around the end of the first week. Most symptoms resolve within two to three weeks, though people with higher body fat percentages may process residual THC more slowly.
What Makes Detox Longer or Shorter
The timelines above are averages. Your actual experience depends on a web of overlapping factors. Higher doses and more frequent use build greater physical dependence, which translates to more intense and prolonged withdrawal. Someone who has been drinking heavily for a decade will have a harder detox than someone who escalated over a few months. Duration of use matters because the body accumulates neurological changes over time that take longer to reverse.
Age and organ health play a significant role. Older adults and people with liver, kidney, or cardiovascular problems tend to detox more slowly and need closer monitoring. Metabolism speed and genetic differences in how your body processes substances also shift the timeline in either direction.
Co-occurring mental health conditions, particularly anxiety, depression, and PTSD, often amplify withdrawal symptoms. This is especially noticeable during stimulant and opioid detox, where mood-related symptoms are already prominent. Poor nutrition and dehydration can delay the process and make symptoms worse, which is why medical detox programs prioritize both. People who use multiple substances at once face overlapping withdrawal timelines, which complicates and extends the overall detox period.
Post-Acute Withdrawal Can Last Months
Finishing the acute phase of detox doesn’t always mean feeling normal. Post-acute withdrawal syndrome (PAWS) refers to a cluster of psychological and mood-related symptoms that can persist for months to years after acute withdrawal ends. Common symptoms include anxiety, irritability, sleep disruption, difficulty concentrating, and mood swings that fluctuate unpredictably over time.
PAWS is most commonly associated with alcohol, opioids, and benzodiazepines, though it can follow stimulant and cannabis withdrawal as well. These symptoms tend to come in waves, improving for stretches and then returning. They do eventually resolve, but the timeline is highly individual. Understanding that this phase exists helps prevent the common mistake of assuming something is wrong when lingering symptoms surface weeks or months into recovery.