Withdrawal symptoms can last anywhere from a few days to several months, depending on the substance. For most substances, the worst physical symptoms peak within the first one to three days and fade within one to two weeks. But psychological symptoms like mood changes, sleep problems, and cravings often linger for weeks or months after the acute phase ends.
The timeline varies dramatically by substance, how long you used it, and how much. Here’s what to expect for the most common substances people withdraw from.
Alcohol Withdrawal
Mild symptoms like headache, anxiety, and insomnia typically appear within 6 to 12 hours after your last drink. Things escalate from there. Within 24 hours, some people experience hallucinations. The risk of seizures is highest between 24 and 48 hours, and a dangerous condition called delirium tremens can appear between 48 and 72 hours after the last drink.
For most people with mild to moderate withdrawal, symptoms peak between 24 and 72 hours and then start improving. But some symptoms don’t follow that neat timeline. Insomnia and mood changes can persist for weeks or even months after the acute phase resolves. The severity of alcohol withdrawal depends heavily on how much and how long you were drinking. Heavy, long-term drinkers face the most serious and prolonged symptoms, and severe alcohol withdrawal can be life-threatening without medical supervision.
Opioid Withdrawal
Opioid withdrawal timelines split into two categories based on how quickly the drug leaves your body. Short-acting opioids like heroin cause symptoms that begin 6 to 12 hours after the last dose and last roughly five days. The peak is usually around days two and three, with intense muscle aches, nausea, sweating, and restlessness.
Longer-acting opioids like methadone take longer to clear the body, so withdrawal starts later but stretches out over a longer period. The onset is slower and the symptoms are more drawn out, sometimes lasting two weeks or more for the physical phase alone. Regardless of the opioid, cravings and low mood often continue well beyond the physical symptoms.
Benzodiazepine Withdrawal
Benzodiazepines are among the most unpredictable substances to withdraw from. Symptoms that appear in the first week after stopping tend to blend into more persistent problems that can last for many months. Rebound anxiety, the return of the very symptoms the medication was treating, is common and can be intense enough that people mistake it for a worsening of their original condition.
Setting precise limits on how long benzodiazepine withdrawal lasts is difficult because it varies so widely from person to person. People who took higher doses for longer periods generally face a longer and more difficult withdrawal. A slow, gradual taper rather than abrupt stopping is the standard approach to minimize these symptoms. Seizures are a real risk with abrupt cessation, making medical guidance especially important for this class of drugs.
Antidepressant Discontinuation
Stopping antidepressants, particularly SSRIs, causes withdrawal symptoms in a large majority of people. A 2025 survey found that 79% of patients reported withdrawal symptoms of some degree after stopping, and 45% described them as severe or moderately severe. Common symptoms include dizziness, electric shock sensations in the head (often called “brain zaps”), nausea, irritability, and vivid dreams.
For most people, these symptoms resolve within a few weeks. But 20% of those surveyed reported symptoms lasting more than three months, and 10% experienced them for over a year. The longer you’ve been on an antidepressant, the more likely you are to have prolonged symptoms. People who used antidepressants for more than 24 months before stopping were significantly more likely to report longer-lasting withdrawal. Tapering slowly, rather than stopping abruptly, reduces the intensity of these effects.
Stimulant Withdrawal
Cocaine and methamphetamine withdrawal looks different from most other substances. The “crash” hits almost immediately after a binge ends, bringing extreme fatigue, increased appetite, and a deep low mood. There’s less of the physical agony associated with opioid or alcohol withdrawal, but the psychological impact is significant.
Cravings and depression can last for months after stopping long-term, heavy stimulant use. The brain’s reward system takes time to recalibrate after being flooded with unnaturally high levels of feel-good chemicals, and during that recovery period, everyday activities can feel flat and unrewarding.
Cannabis Withdrawal
Cannabis withdrawal is real and formally recognized, though it tends to be milder than withdrawal from alcohol or opioids. The most distressing symptom for most people is trouble sleeping. In one study, sleep problems began within about three days of quitting and lasted an average of 43 days, though some individuals experienced them much longer. Nightmares and unusually vivid dreams are the most commonly reported symptoms and tend to peak around a day and a half after quitting.
Overall symptom severity peaks somewhere between 6 and 20 days, with irritability, anxiety, and appetite changes rounding out the picture. Some symptoms can linger for months in heavy, long-term users. The wide range reflects how much individual biology and use patterns matter.
Nicotine Withdrawal
Nicotine withdrawal is front-loaded. The worst of it hits in the first 24 to 48 hours after quitting, with intense cravings, irritability, difficulty concentrating, and increased appetite. Individual cravings are brief, usually lasting only a few minutes each, but they come frequently in those early days.
After about two weeks, symptoms are noticeably less severe. Most physical withdrawal symptoms resolve or become manageable within the first few weeks. Cravings can pop up for months afterward, particularly in response to triggers like social situations or stress, but they become less frequent and easier to ride out over time.
Post-Acute Withdrawal Syndrome
Beyond the acute phase, many people experience a prolonged set of symptoms known as post-acute withdrawal syndrome, or PAWS. This applies across multiple substances and refers to psychological and mood-related symptoms that persist for months to years after the initial withdrawal ends. Common PAWS symptoms include anxiety, irritability, sleep disturbances, difficulty concentrating, and low motivation.
These symptoms tend to fluctuate rather than follow a steady decline. You might feel fine for a few weeks, then hit a rough patch that lasts several days before improving again. This wave-like pattern is characteristic of PAWS and can be discouraging if you’re not expecting it. The underlying cause is that chronic substance use creates changes in brain chemistry and neural circuits that take much longer to heal than the initial physical withdrawal suggests. These changes affect emotions and behavior and persist well after the acute symptoms have cleared.
What Affects How Long Withdrawal Lasts
Several factors push withdrawal timelines shorter or longer. The substance itself is the biggest variable, as each drug has its own pharmacology and clearance rate. Beyond that, the dose you were taking and how long you used the substance matter enormously. Someone who drank heavily for 20 years will generally face a longer, more intense withdrawal than someone who drank heavily for six months.
Your individual biology plays a role too. Metabolism, liver function, age, and overall health all influence how quickly your body clears a substance and how efficiently your brain chemistry rebalances. Using multiple substances complicates the picture further, as withdrawal timelines can overlap and interact. People with co-occurring mental health conditions often experience more prolonged psychological symptoms, since the brain is managing multiple recovery processes simultaneously.
The method of stopping also matters. Abrupt cessation (“cold turkey”) generally produces more intense but sometimes shorter acute symptoms, while gradual tapering spreads symptoms out over a longer period at lower intensity. For alcohol, benzodiazepines, and antidepressants in particular, a supervised taper is the safer and more comfortable approach.