If someone you love has been drinking heavily and wants to stop, your first instinct may be to support them through it at home. This instinct comes from love — and in most cases, it needs to be resisted. Alcohol withdrawal is one of the few substance withdrawals that can kill. Understanding the risks clearly could save a life.

Why Alcohol Withdrawal Is Different

Most substance withdrawals, while deeply unpleasant, are not medically life-threatening. Alcohol withdrawal is different. It is one of a small number of withdrawal syndromes — along with benzodiazepines — where the body’s reaction to sudden abstinence can produce fatal complications.

This is not a rare or extreme outcome reserved for the most severe cases. Seizures can occur in people who would not describe their drinking as that serious. The severity of withdrawal does not always correlate neatly with how much someone was drinking.

What Happens During Alcohol Withdrawal

Alcohol acts as a central nervous system depressant. With prolonged heavy drinking, the brain compensates by increasing its own excitatory activity to maintain balance. When alcohol is suddenly removed, that excitatory activity is no longer being damped — and the nervous system can go into overdrive.

• 6–12 hours after the last drink: Anxiety, tremor, sweating, nausea, raised heart rate and blood pressure, insomnia
• 12–24 hours: Symptoms intensify; hallucinations may begin — typically visual, sometimes auditory
• 24–48 hours: Peak risk period. Seizures most commonly occur in this window.
• 48–72 hours: Risk of delirium tremens (DTs) — severe confusion, agitation, fever, sweating, and cardiovascular instability. DTs are a medical emergency.
• Beyond 72 hours: Symptoms typically begin to resolve if no serious complications have developed — though protracted symptoms can continue for weeks

Who Is at Risk of Serious Complications?

Medical professionals assess several risk factors when evaluating withdrawal risk:

• History of previous withdrawal seizures or DTs — the single strongest predictor of future serious withdrawal
• Daily heavy drinking for a prolonged period (months or years)
• High volume of consumption — typically more than 8–10 units per day
• Co-occurring medical conditions, particularly liver disease, malnutrition, or cardiovascular problems
• Age — older people are at higher risk

Critically: someone does not need to check all of these boxes for serious withdrawal to occur. If in any doubt, medical assessment should happen before any attempt to stop drinking.

What Medical Detox Offers

Medical alcohol detox uses a structured protocol — typically benzodiazepines, given on a tapering schedule — to calm the nervous system safely through the withdrawal period. This dramatically reduces the risk of seizures and DTs. Thiamine (Vitamin B1) is also given, as alcohol-related B1 deficiency can cause serious neurological damage (Wernicke’s encephalopathy).

Medical detox does not have to mean inpatient hospital admission. Many GP practices and specialist community alcohol services can supervise home detox with regular check-ins and prescription medications — though this is appropriate only for people assessed as lower risk.

What Families Should Do

• Do not encourage a heavy drinker to simply stop without first speaking to a doctor or addiction specialist
• If withdrawal symptoms have already begun and are progressing — increasing tremor, confusion, hallucinations — call for medical help immediately, do not wait to see if it gets better
• If you cannot reach medical help and seizure occurs: call emergency services, do not restrain them, time the seizure, position them safely on their side to prevent choking
• For community alcohol detox services in the UK: speak to the GP or contact local alcohol services. In the US: contact SAMHSA (1-800-662-4357) for local referrals.

After Detox

Completing alcohol detox safely is the beginning of recovery, not the end. The psychological dependence, the habits, and the reasons for drinking remain entirely intact after the body has cleared the alcohol. Follow-on treatment — therapy, AA, SMART Recovery, residential programme if appropriate — is what determines whether detox leads to lasting change.

See: Treatment Options: A Family Guide →