Withdrawal symptoms typically last anywhere from a few days to several weeks, depending on the substance. Caffeine withdrawal can resolve in under 10 days, while benzodiazepine withdrawal can stretch for months. The timeline depends on what you were taking, how long you used it, and how quickly your body clears the substance.
Beyond the initial physical symptoms, some people experience a longer phase of mood and sleep disruptions that can persist for up to two years. Here’s what to expect for the most common substances.
Alcohol
Alcohol withdrawal symptoms tend to appear within 8 hours of the last drink, though they can sometimes show up days later. Symptoms peak between 24 and 72 hours, then gradually improve. Most physical symptoms resolve within a week, but milder effects like anxiety and sleep disruption can linger for weeks.
A small percentage of heavy, long-term drinkers develop a severe form of withdrawal called delirium tremens, which can cause sudden confusion, hallucinations, seizures, and fever. This is a medical emergency. The risk is highest in people who have been drinking heavily for years or who have gone through withdrawal before.
Opioids
The timeline for opioid withdrawal depends heavily on whether the drug is short-acting or long-acting. Heroin and immediate-release painkillers cause symptoms that start 6 to 12 hours after the last dose and last roughly five days. Long-acting opioids like methadone take longer to leave your system, so withdrawal starts later but stretches out over a longer period.
As a general rule, shorter-acting drugs produce a more intense but briefer withdrawal, while longer-acting drugs produce a slower, more drawn-out experience. Physical dependence on opioids can develop in as little as two to three weeks of regular use, which is faster than most other substance classes.
Benzodiazepines
Benzodiazepine withdrawal is one of the longest and most variable timelines. Acute withdrawal generally lasts 5 to 28 days, though some people experience symptoms for several months. The drug’s half-life matters: short-acting benzodiazepines produce a withdrawal phase of roughly 2 to 4 weeks, while long-acting ones can cause symptoms lasting 2 to 8 weeks.
An estimated 10 to 25% of people who use benzodiazepines for extended periods experience protracted withdrawal symptoms lasting 12 months or longer. These can include cognitive fog, muscle pain, and tremors. Because of this risk, doctors almost always recommend tapering off benzodiazepines gradually rather than stopping abruptly. Physical dependence can form within about six weeks of regular use, especially at higher doses.
Nicotine
Nicotine withdrawal starts fast, usually within 4 to 24 hours of your last cigarette, vape, or other nicotine product. Symptoms peak on the second or third day, then fade over the next three to four weeks. After day three, things generally improve a little each day.
The physical symptoms (irritability, headaches, trouble concentrating, increased appetite) are relatively short-lived compared to other substances. Cravings, however, can persist much longer and are the main reason people relapse. The worst of it is usually behind you within the first week.
Caffeine
Caffeine withdrawal begins 12 to 24 hours after your last cup of coffee or other caffeine source. The hallmark symptom is a throbbing headache, often accompanied by fatigue, difficulty concentrating, and irritability. The whole process typically lasts 2 to 9 days, making it one of the shortest withdrawal timelines.
Cannabis
Cannabis withdrawal is a relatively recent addition to clinical recognition, but it’s real for heavy, long-term users. Symptoms begin within 24 to 48 hours of stopping, peak around day three, and generally last up to two weeks. Very frequent users may experience certain symptoms, particularly sleep problems and irritability, for three weeks or more.
Antidepressants
Stopping antidepressants (particularly SSRIs) can cause what’s known as discontinuation syndrome. This isn’t addiction-related withdrawal in the traditional sense, but the symptoms are real and sometimes disorienting. They typically begin two to four days after stopping and last less than two months. Most cases are mild and resolve within eight weeks.
Common symptoms include flu-like feelings (fatigue, headache, achiness, sweating) and unusual burning, tingling, or electric shock-like sensations sometimes called “brain zaps.” Tapering off slowly rather than stopping suddenly reduces the risk significantly.
What Makes Withdrawal Last Longer
Several factors determine whether your withdrawal will be on the shorter or longer end of the range:
- Duration of use: The longer you’ve been taking a substance regularly, the more your brain has adapted to its presence, and the longer it takes to readjust.
- Dose: Higher doses create deeper physiological dependence, which generally means more intense and longer-lasting withdrawal.
- Drug potency and half-life: More potent drugs with shorter half-lives tend to produce faster-onset, more intense withdrawal. Drugs that stay in your system longer cause a more gradual but prolonged process.
- Age: Older adults and adolescents can experience withdrawal differently. Older adults tend to develop distinct symptom patterns with benzodiazepines, while adolescents and older children may have more severe opioid withdrawal than younger children.
- Previous withdrawal episodes: Each time you go through withdrawal, the next episode can be more severe, a phenomenon sometimes called “kindling.”
Post-Acute Withdrawal Syndrome
After the initial physical symptoms subside, some people enter a second phase called post-acute withdrawal syndrome, or PAWS. This involves subtler but persistent symptoms: mood swings, sleep problems, fatigue, difficulty concentrating, and cravings. PAWS can last anywhere from a few months to two years.
The specific symptoms vary by substance. Alcohol-related PAWS tends to involve anxiety, depression, and irritability. Opioid-related PAWS often shows up as mood swings, insomnia, and low motivation. Stimulant-related PAWS frequently includes depression and poor impulse control. Cannabis-related PAWS can cause vivid dreams, headaches, and disrupted sleep.
PAWS symptoms aren’t constant. They tend to come in waves, with good stretches interrupted by flare-ups that gradually become less frequent and less intense over time. Understanding that this phase is normal, and temporary, helps many people stay on track during recovery.