Drug detox timelines range from a few days to several months, depending on the substance. Acute withdrawal from most drugs peaks within one to three days and resolves within one to two weeks, but some substances (particularly benzodiazepines and long-acting opioids) can stretch that window significantly. Beyond the initial detox, a secondary phase of lingering symptoms can last six months to two years.
The variation is wide because different drugs affect the brain and body in fundamentally different ways. Here’s what to expect for each major substance.
Alcohol: 3 to 7 Days for Acute Withdrawal
Mild alcohol withdrawal symptoms like headache, anxiety, and insomnia typically begin within 6 to 12 hours after the last drink. For most people with mild to moderate dependence, symptoms peak between 24 and 72 hours and then start to ease. The full acute phase usually wraps up within about a week.
The danger zone is the 48- to 72-hour mark, when a severe complication called delirium tremens can appear. This involves confusion, rapid heartbeat, fever, and sometimes seizures. The seizure risk is highest 24 to 48 hours after the last drink. Delirium tremens is fatal in roughly 5% to 10% of people who develop it, which is why heavy, long-term drinkers are strongly encouraged to detox under medical supervision rather than stopping abruptly at home.
Opioids: 5 Days to 3 Weeks
Opioid detox timelines split into two categories based on whether the drug is short-acting or long-acting.
Short-acting opioids like heroin and certain prescription painkillers cause withdrawal symptoms that start 6 to 12 hours after the last dose and last roughly five days. Symptoms come on fast and hit hard, but they also resolve more quickly. Expect intense muscle aches, nausea, sweating, anxiety, and insomnia during the peak, which is usually around days two and three.
Long-acting opioids like methadone have a slower, more drawn-out withdrawal. Symptoms may not begin for 24 to 36 hours and can stretch to two or three weeks. The intensity is often lower day to day, but the extended timeline can be mentally exhausting.
Three FDA-approved medications are commonly used to ease opioid withdrawal and reduce cravings: buprenorphine, methadone, and naltrexone. These don’t just manage detox symptoms; they’re also used in longer-term treatment to prevent relapse. Medication-assisted detox is significantly more comfortable and more likely to succeed than going cold turkey.
Benzodiazepines: Weeks to Over a Year
Benzodiazepine detox is one of the longest and most complicated withdrawal processes. Unlike most other substances, stopping benzos abruptly after prolonged use can cause seizures and other dangerous complications. The standard approach is a gradual taper, slowly reducing the dose over time.
How long that taper takes depends heavily on how long you’ve been taking the medication:
- 2 to 8 weeks of use: taper of at least 2 weeks
- 8 weeks to 6 months of use: taper of at least 4 weeks
- 6 months to 1 year of use: taper of at least 8 weeks
- More than 1 year of use: taper of 6 to 18 months
The speed of the taper also depends on the original dose, the specific benzodiazepine, and how your body responds at each reduction. Short- and intermediate-acting benzos tend to produce more frequent withdrawal symptoms between doses, making a smooth taper harder to achieve. Many people experience waves of anxiety, insomnia, and irritability that come and go throughout the process.
Cannabis: 1 to 3 Weeks
Cannabis withdrawal is milder than most other substances but still real, especially for heavy, long-term users. Symptoms typically begin within 24 to 48 hours of stopping, peak around day three, and last up to two weeks. For people who used very frequently, some symptoms can linger for three weeks or more.
Common withdrawal symptoms include irritability, sleep problems, decreased appetite, restlessness, and cravings. It’s not physically dangerous, but the sleep disruption and mood changes can be significant enough to drive people back to using if they aren’t prepared for it.
Stimulants: 1 to 2 Weeks of Acute Symptoms
Stimulants like cocaine and methamphetamine don’t produce the same kind of physically dangerous withdrawal that alcohol and benzodiazepines do. Instead, the detox period is dominated by a “crash” phase: deep fatigue, increased appetite, depression, and intense cravings. This crash typically starts within hours of the last use and the worst of it passes within a week or two. The psychological symptoms, particularly depression and cravings, can persist much longer.
What Affects Your Personal Timeline
Two people using the same drug for the same amount of time can have very different detox experiences. Several biological factors influence how quickly your body processes and clears a substance.
Liver function is the biggest variable. The liver is the primary site where drugs are broken down, so any liver damage or disease slows that process considerably. Kidney function matters too, since the kidneys handle excretion. An 85-year-old’s kidneys clear drugs at roughly half the rate of a 35-year-old’s. Age in general plays a role: older adults metabolize substances more slowly, which can extend withdrawal timelines. Genetic differences in metabolic enzymes also create natural variation between individuals.
Beyond biology, the dose you were taking, how long you were using, and whether you were using multiple substances simultaneously all affect the severity and duration of withdrawal.
The Longer Phase Most People Don’t Expect
After acute withdrawal ends, many people enter a second phase called post-acute withdrawal syndrome, or PAWS. This is the part that catches people off guard because it can last 6 to 24 months after the initial detox.
PAWS doesn’t feel like the intense physical withdrawal of the first week. Instead, it shows up as difficulty thinking clearly, short-term memory problems, emotional numbness or overreaction, sleep disturbances, physical coordination issues like dizziness or sluggish reflexes, and heightened sensitivity to stress. These symptoms tend to come in waves rather than being constant, and stress makes all of them worse.
Understanding that PAWS is a normal part of recovery matters because many people interpret these symptoms as a sign that something is permanently wrong, or that they need to use again to feel normal. The brain is recalibrating after prolonged substance exposure, and that process simply takes time.
Inpatient vs. Outpatient Detox
Not every detox requires a hospital stay. Addiction medicine uses a tiered system to match the level of care to the severity of withdrawal. At one end, outpatient detox involves scheduled check-ins with a clinician while you stay at home. At the other end, medically managed inpatient detox provides 24-hour monitoring and treatment in an acute care setting.
The deciding factors are which substance you’re detoxing from, how severe your dependence is, your medical history, and whether you have a safe home environment. Alcohol and benzodiazepine withdrawal carry the highest physical risk and most often require medical monitoring. Opioid detox is rarely life-threatening but is far more successful with medication support. Cannabis and stimulant withdrawal can typically be managed in an outpatient setting.
Whatever the substance, detox is the first step rather than the whole treatment. The acute withdrawal phase, even at its longest, represents a small fraction of the recovery process. The weeks and months that follow, including navigating PAWS, building new routines, and addressing the reasons behind the substance use, are where long-term recovery takes shape.