Withdrawal timelines vary widely depending on the substance, but most acute physical symptoms resolve within one to four weeks. Some substances cause withdrawal that peaks and fades in just a few days, while others can produce lingering symptoms for months. The type of drug, how long you used it, how much you used, and your individual biology all play a role in how long the process takes.
Below is a substance-by-substance breakdown of what to expect, followed by the factors that push these timelines shorter or longer.
Alcohol Withdrawal
Alcohol withdrawal is one of the fastest to begin and one of the most medically serious. Mild symptoms like headache, anxiety, and insomnia can appear within 6 to 12 hours of your last drink. Things escalate quickly from there: hallucinations may develop within 24 hours, and the risk of seizures is highest between 24 and 48 hours.
For most people with mild to moderate withdrawal, symptoms peak somewhere between 24 and 72 hours and then begin improving. A dangerous condition called delirium tremens, which involves confusion, rapid heart rate, and fever, can appear 48 to 72 hours after the last drink, though it only affects a small percentage of people going through withdrawal.
The acute phase generally wraps up within a week. However, some people experience prolonged symptoms like insomnia and mood changes that persist for weeks or even months.
Opioid Withdrawal
Opioid withdrawal timelines depend heavily on whether the drug is short-acting or long-acting. For short-acting opioids like heroin, symptoms begin 6 to 12 hours after the last dose and last roughly five days. Expect muscle aches, nausea, sweating, anxiety, and insomnia that peak around days two and three before gradually easing.
Long-acting opioids like methadone follow a slower pattern. Withdrawal takes longer to start, sometimes not appearing for a day or more, but it also stretches out over a longer period. The overall experience is often less intense at its peak but drawn out, sometimes lasting two to three weeks for the physical symptoms to fully clear.
Benzodiazepine Withdrawal
Benzodiazepines have some of the longest withdrawal timelines of any commonly used substance, and stopping them abruptly can be dangerous. Short-acting benzodiazepines typically trigger withdrawal within one to two days, with symptoms peaking around 7 to 14 days before gradually subsiding. Long-acting benzodiazepines start withdrawal later, around 2 to 7 days after the last dose, and peak around day 20 before tapering off over the following weeks.
Because of these extended timelines and the risk of seizures, benzodiazepine withdrawal is almost always managed through a slow, controlled dose reduction rather than abrupt cessation. A gradual taper can stretch across weeks or months, but it keeps symptoms manageable and reduces the chance of serious complications.
Nicotine Withdrawal
Nicotine withdrawal begins within a few hours of your last cigarette. Irritability, cravings, difficulty concentrating, and increased appetite are the hallmarks. On average, these symptoms last three to four weeks, though some people feel them for a few months. The physical withdrawal is rarely dangerous, but the cravings and mood disruption are intense enough in the first two weeks that this period carries the highest risk of relapse.
Cannabis Withdrawal
Cannabis withdrawal is a recognized clinical syndrome, though it only affects heavy, long-term users. Symptoms typically begin within 24 to 48 hours of stopping and peak by day three. Irritability, sleep problems, decreased appetite, and restlessness are the most common complaints. Most symptoms resolve within two weeks, though people who used very heavily may experience certain symptoms for three weeks or more.
Antidepressant Discontinuation
Stopping SSRIs or similar antidepressants can produce what’s formally called discontinuation syndrome. Symptoms include dizziness, nausea, brain zaps (brief electrical-shock sensations), irritability, and flu-like feelings. These emerge within days to weeks of stopping the medication or lowering the dose, typically once 90% or more of the drug has left your system.
For most people, discontinuation symptoms resolve as the body readjusts, generally within a few weeks. If symptoms are still present and worsening after a month, it may signal a return of the underlying depression rather than ongoing discontinuation. Tapering slowly under guidance significantly reduces the chances of experiencing these symptoms at all.
Post-Acute Withdrawal Syndrome
After the acute phase of withdrawal ends, some people enter a longer period of lingering symptoms known as post-acute withdrawal syndrome, or PAWS. This can follow dependence on alcohol, opioids, benzodiazepines, or stimulants. The symptoms are more subtle than acute withdrawal: mood swings, anxiety, low energy, sleep disturbances, and difficulty with concentration or memory.
PAWS typically takes between 6 and 24 months to fully resolve. Symptoms tend to come in waves rather than staying constant, which can be confusing and discouraging. Understanding that these episodes are a normal part of the brain’s recovery process helps put them in context.
What Makes Withdrawal Shorter or Longer
A drug’s half-life, meaning how quickly your body eliminates it, determines when withdrawal starts. Faster-clearing substances trigger earlier, sharper withdrawal. But the most important factor in total duration is how long it takes the brain’s adaptations to the drug to reverse themselves, and that depends on more than just the drug’s chemistry.
Several factors push your personal timeline in one direction or the other:
- Duration of use. Someone who used a substance for years will generally face a longer withdrawal than someone who used it for a few months.
- Dosage. Higher doses create deeper physical dependence, which takes longer to unwind.
- Frequency of use. Daily use produces more consistent adaptation in the brain than occasional use.
- Individual metabolism and overall health. Liver function, age, nutrition, and concurrent health conditions all influence how quickly your body processes and recovers from a substance.
- Polysubstance use. Using multiple substances simultaneously can complicate and extend withdrawal because the brain is adapting to more than one chemical at once.
The precise duration of withdrawal is difficult to predict for any individual. It may take days, weeks, or in some cases months to reach complete resolution. The timelines above represent typical ranges, but your own experience will fall somewhere on that spectrum based on the combination of factors unique to your situation.