What Happens During Withdrawal
Withdrawal is the body's reaction to the absence of a substance it has become physically dependent on. Understanding what actually happens, physiologically, neurologically, and emotionally, helps families approach this process with realistic expectations, appropriate urgency, and compassion.
Medically Reviewed by:
Dr. Darrin Mangiacarne
Chief Medical Officer
At Banyan Treatment Centers, Chief Medical Officer Dr. Darrin Mangiacarne leads our nationwide clinical team with over a decade of addiction medicine experience, helping ensure evidence-based, compassionate care across every level of treatment.
Author / Written by: Banyan Editorial Staff
Medically reviewed by: Dr. Darrin Mangiacarne, CMO
Updated on: August 2026
Family Resources Hub › Substance Use Resources › What Happens During Withdrawal
Withdrawal is the body's reaction when a person reduces or stops a substance after developing physical dependence. Understanding what happens during drug withdrawal, including the physical, neurological, and emotional changes involved, can help families recognize withdrawal symptoms, understand the potential risks, and know when professional withdrawal treatment may be appropriate.
The drug withdrawal process varies considerably depending on the substance involved. Drug withdrawal symptoms may be mild for some people and severe or potentially life-threatening for others. Alcohol, opioids, benzodiazepines, stimulants, cannabis, and other drugs can produce different drug withdrawal syndromes, timelines, and treatment needs.
Why Withdrawal Happens: The Brain Science
When a person uses a substance regularly over time, the brain and body adapt. The brain may recalibrate its chemistry, producing less of certain neurotransmitters on its own or becoming less sensitive to them because the substance has been affecting those systems. This adaptation, known as neuroadaptation, contributes to tolerance, physical dependence, and withdrawal.
When someone who has developed physical dependence reduces their use or suddenly stops taking a substance, the brain and body must adjust to functioning without it. The result can be a rebound effect: systems that were suppressed by the substance may become overactive, while systems that were stimulated may temporarily function differently. These changes contribute to drug withdrawal symptoms and the broader withdrawal process.
Different substances act on different brain systems, which is why a withdrawal syndrome can look and feel very different depending on the drug involved, how long it was used, how much was typically consumed, the time since the last dose, the person's physical health, and whether alcohol or other drugs are involved.
The severity and duration of drug withdrawal can therefore vary significantly from one person to another. Certain drugs can also produce more serious risks during withdrawal than others, making professional assessment especially important.
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What Drug Withdrawal Looks Like: Substance by Substance
The experience of drug withdrawal varies dramatically depending on the substance. Symptoms can begin within hours of the last dose for some substances, while others have a slower onset.
Some people experience primarily physical symptoms, while others experience significant psychological effects. The appropriate approach to withdrawal management therefore depends on the substance, severity of dependence, medical history, and symptoms. Here is what families may encounter with several major categories of substances.
Alcohol Withdrawal — Potentially Life-Threatening
Alcohol withdrawal can become life-threatening and may require medical supervision. Severe alcohol withdrawal can involve seizures and delirium tremens. People at risk for severe alcohol withdrawal should receive an evaluation from a medical professional rather than attempting to stop alcohol without medical guidance.
Common Symptoms
- Anxiety, agitation, and irritability
- Tremors, especially in the hands
- Sweating and elevated heart rate
- Changes in blood pressure
- Nausea and vomiting
- Headache
- Insomnia
- Hallucinations
- Seizures
- Delirium tremens in severe cases
Timeline
- 6–12 hrs: Anxiety, tremors, and sweating may begin
- 12–24 hrs: Symptoms may intensify; hallucinations are possible
- 24–48 hrs: Seizure risk may be elevated
- 48–72 hrs: Delirium tremens may occur in severe cases
- Week 1: Many acute symptoms may begin improving with appropriate treatment
- Weeks 2–4: Some symptoms, including anxiety or sleep disturbance, may continue
The alcohol withdrawal timeline is not identical for everyone. Because severe alcohol withdrawal carries serious risks, seek medical care if severe symptoms, seizures, hallucinations, confusion, or other concerning changes occur.
Opioid Withdrawal — Intensely Uncomfortable, High Relapse Risk
Opioid withdrawal can produce significant physical and psychological distress. Medical assessment and support may help people safely manage symptoms and determine appropriate treatment. For someone with an opioid use disorder, withdrawal can become a major barrier to stopping opioid use and continuing treatment.
Common Symptoms
- Severe muscle aches and cramps
- Stomach cramps
- Nausea, vomiting, and diarrhea
- Sweating and chills
- Teary eyes and runny nose
- Goosebumps, sometimes associated with the phrase "cold turkey"
- Insomnia and extreme restlessness
- Anxiety, agitation, and irritability
- Intense cravings
Timeline
- 8–24 hrs: Symptoms may begin with some short-acting opioids
- 36–72 hrs: Symptoms may become more severe
- Days 4–7: Many acute physical symptoms may begin to subside
- Weeks 2–4: Some psychological symptoms may persist
- Following weeks or months: Some people may continue experiencing mood, sleep, or craving-related symptoms
The timing of opioid withdrawal depends partly on the opioid involved. People experiencing significant opioid withdrawal symptoms should speak with a medical doctor or other qualified healthcare professional about appropriate withdrawal treatment and ongoing treatment for opioid use disorder.
Benzodiazepine Withdrawal — Potentially Dangerous, Slow-Onset
Benzodiazepine withdrawal can become dangerous and should be medically evaluated. Abruptly stopping benzodiazepines after physical dependence develops can cause severe symptoms, including seizures. Because some benzodiazepines remain in the body longer than others, the withdrawal timeline can also be less predictable.
Common Symptoms
- Severe anxiety and panic attacks
- Insomnia and sleep disturbances
- Tremors and muscle tension
- Sweating and heart palpitations
- Sensory hypersensitivity to light, sound, or touch
- Headaches and cognitive impairment
- Seizures
- Psychosis in severe cases
- Involuntary movements or muscle spasms in some cases
Timeline
- Short-acting benzodiazepines: Symptoms may begin within a few days
- Long-acting benzodiazepines: Symptoms may take longer to emerge
- Peak: Timing varies depending on the medication and pattern of use
- Duration: Some symptoms can continue for weeks or longer
- Protracted symptoms: A subset of people may experience persistent symptoms
Because benzodiazepine withdrawal can carry serious risks, someone taking these medications regularly should consult a medical professional before making significant changes to their medication.
Stimulant Withdrawal (Meth, Cocaine, Prescription Stimulants)
Stimulant drug withdrawal can produce substantial psychological symptoms, including depression, fatigue, sleep changes, and cravings. Although the medical risks differ from those associated with severe alcohol or benzodiazepine withdrawal, psychological symptoms can still require professional care.
Common Symptoms
- Extreme fatigue and prolonged sleep, sometimes called the "crash"
- Depression and emotional flatness
- Intense cravings
- Increased appetite after a period of suppression
- Cognitive slowing and difficulty concentrating
- Suicidal thoughts in some individuals
- Paranoia that may persist from active drug use
- Anxiety and irritability
Timeline
- Hours after last use: The crash may begin
- Days 1–3: Fatigue, mood changes, and increased sleep may be significant
- Days 4–7: Some symptoms may begin improving while cravings continue
- Weeks 2–4: Depression or difficulty experiencing pleasure may continue
- Following weeks or months: Some psychological symptoms and cravings may persist
Anyone experiencing suicidal thoughts, severe depression, psychosis, or another psychiatric emergency during stimulant withdrawal needs immediate professional evaluation.
Cannabis Withdrawal
Cannabis withdrawal is clinically recognized and can occur after frequent or prolonged cannabis use. Although it generally has a different risk profile from severe alcohol withdrawal or benzodiazepine withdrawal, the symptoms can still interfere with sleep, mood, and daily functioning.
Common Symptoms
- Irritability, anger, and anxiety
- Insomnia and vivid dreams
- Decreased appetite and weight loss
- Restlessness and physical tension
- Depressed mood
- Headaches and sweating
Timeline
- Days 1–3: Symptoms may begin
- Days 4–14: Symptoms generally begin improving
- 2–4 weeks: Many symptoms resolve
- Sleep disruption: May persist longer for some heavy or long-term users
The severity of any drug withdrawal syndrome depends on the substance, frequency of drug use, physical dependence, health, and individual circumstances.
PAWS: Post-Acute Withdrawal Syndrome
Many families are unprepared for symptoms that may continue after the acute withdrawal period ends. The term Post-Acute Withdrawal Syndrome (PAWS) is sometimes used to describe persistent or recurring symptoms that continue after acute withdrawal.
These symptoms can include mood changes, sleep difficulties, cravings, anxiety, and cognitive problems. Their duration and severity vary considerably by person and substance. People receiving care for a substance use disorder may continue to need medical and psychological care after acute withdrawal. Ongoing treatment can address persistent symptoms while also supporting recovery from drug addiction, alcohol addiction, or another substance use disorder.
Common Post-Acute Symptoms
- Difficulty concentrating and cognitive fog
- Mood swings and emotional volatility
- Ongoing sleep disturbances
- Persistent anxiety or depression
- Difficulty experiencing pleasure
- Fatigue and low energy
- Episodic cravings
- Reduced stress tolerance
What Families Should Know About Persistent Withdrawal Symptoms
- Symptoms following acute withdrawal can vary significantly from person to person
- Good days and difficult days may occur during recovery
- Persistent cravings or mood symptoms can increase relapse risk
- Stress may worsen some symptoms
- Sleep, therapy, appropriate exercise, and ongoing care may support recovery
- A treatment professional can evaluate symptoms that are severe, persistent, or worsening
Supporting Your Loved One Through Drug Withdrawal
Understanding what happens during drug withdrawal can help families respond appropriately when a loved one develops symptoms. The most important consideration is whether the person can safely undergo withdrawal without professional medical care.
Advocate for Medical Support and Withdrawal Management
Alcohol and benzodiazepine withdrawal can become life-threatening, and significant opioid withdrawal may also benefit from medical care and treatment. If you are unsure about the risks, speak with a medical professional before your loved one attempts to stop using a substance.
Professional withdrawal management may include medical assessment, monitoring, supportive care, and medications when clinically appropriate. The goal of withdrawal treatment is to help manage symptoms and address medical or psychological complications that may occur during the withdrawal process. The appropriate approach to safe withdrawal depends on the substance, physical dependence, current symptoms, medical history, and whether the person is using alcohol or other drugs.
Understand It Is Not Weakness
Drug withdrawal symptoms are associated with physiological changes that occur when the body attempts to adjust after regular substance use is reduced or stopped. A person in withdrawal is not necessarily exaggerating their symptoms or lacking commitment to recovery.
Someone experiencing withdrawal symptoms may have nausea, anxiety, insomnia, sweating, pain, cravings, or other physical and psychological effects. Some people may need medical and psychological care to safely manage symptoms and begin to stabilize.
Plan for What Comes After Withdrawal Treatment
Withdrawal management is only one part of treatment for a substance use disorder. Detox alone does not address all of the behavioral, psychological, medical, and social factors associated with drug addiction or ongoing substance use.
Work with the treatment team to develop a plan for follow-up treatment before withdrawal management ends. Depending on the person's needs, the next step may include residential treatment, PHP, IOP, outpatient care, medication, therapy, or other support. Continuing with an appropriate drug treatment service after acute withdrawal can help address the underlying substance use disorder and support longer-term recovery. The transition from withdrawal treatment into ongoing care is an important part of the overall treatment process.
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