Substance-specific
Alcohol withdrawal symptoms: A complete timeline from 6 hours to 2 weeks
Alcohol withdrawal is one of the few substance withdrawals that can be fatal. Understanding the timeline helps patients and families know what to expect and when medical intervention is critical.
Hours 6-12: Early symptoms
Within 6-12 hours of the last drink, early withdrawal symptoms begin. These include anxiety, insomnia, nausea, abdominal pain, tremors (especially in the hands), increased heart rate, and elevated blood pressure. These symptoms may feel similar to a severe hangover but are physiologically distinct — they represent the nervous system rebounding from chronic alcohol suppression.
Hours 12-24: Escalation
Symptoms intensify. Tremors worsen. Some people experience alcoholic hallucinosis — visual, auditory, or tactile hallucinations (often described as feeling bugs crawling on the skin). Unlike delirium tremens, the person typically remains oriented and aware that the hallucinations are not real. Seizure risk begins in this window.
Hours 24-48: Peak danger
This is the window of highest risk for alcohol withdrawal seizures, which occur in approximately 5-10% of patients undergoing withdrawal. Seizures can be life-threatening and may progress to status epilepticus (continuous seizures) without medical intervention. This is the primary reason medical detox is recommended for anyone with a history of heavy, chronic alcohol use. Blood pressure and heart rate may reach dangerous levels.
Hours 48-72: Delirium tremens (DTs)
DTs represent the most severe form of alcohol withdrawal and occur in approximately 3-5% of patients. Symptoms include severe confusion, agitation, fever, seizures, hallucinations, and cardiovascular instability. DTs carry a mortality rate of 1-4% even with medical treatment, and up to 37% without treatment. This is a medical emergency requiring intensive care.
Days 5-14: Resolution
For most patients, acute withdrawal symptoms begin to subside after day 5. Anxiety, insomnia, and mood disturbances may persist for weeks to months (post-acute withdrawal syndrome, or PAWS). Medical supervision during this entire period ensures safety, and medications like benzodiazepines, administered on a symptom-triggered protocol, dramatically reduce the severity and danger of withdrawal.
The bottom line
If you or someone you know drinks heavily and daily, do not attempt to stop abruptly without medical supervision. Alcohol withdrawal is a medical condition that requires medical management. Contact a detox facility or emergency department.
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Browse all facilities →Frequently asked questions
How long does alcohol withdrawal last?
Acute alcohol withdrawal typically lasts 5-7 days, with the most dangerous period being 24-72 hours after the last drink. Post-acute symptoms like anxiety and insomnia can persist for weeks to months.
Can alcohol withdrawal kill you?
Yes. Alcohol withdrawal can be fatal, particularly from seizures and delirium tremens (DTs). DTs carry a mortality rate of 1-4% even with treatment. Medical detox is essential for heavy drinkers.
What are the first signs of alcohol withdrawal?
Early symptoms appear within 6-12 hours: anxiety, insomnia, nausea, tremors, increased heart rate, and elevated blood pressure.
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Benzodiazepine addiction: Why you can't quit cold turkey and how tapering worksHow long does rehab take? A realistic timelineThe difference between inpatient and outpatient rehabDisclaimer: Informational only. Not medical advice. Need help? SAMHSA: 1-800-662-4357.