Why alcohol is unusual in how it leaves the body.
Of the substances families confront in addiction, alcohol is unusual: opioid withdrawal is more painful, but alcohol withdrawal is more dangerous. The difference is neurological. Sustained heavy drinking down-regulates the brain’s GABA inhibitory system and up-regulates excitatory glutamate. The body adapts to the depressant effect by becoming progressively more excitable, so that the net experience feels normal as long as the alcohol is present.
When the alcohol is removed abruptly, the depressant effect lifts but the excitable adaptation remains. The nervous system runs hot. Tremor, sweat, anxiety, and rapid pulse appear within hours. In severe cases, the same physiology produces seizures within twenty-four to forty-eight hours and delirium tremens — a state of disorientation, hallucination, and cardiovascular instability — within forty-eight to ninety-six hours. None of this is rare enough to chance.
Hour by hour: what the family will see.
The timeline is reliable enough across patients that knowing it gives families a useful map. The numbers below describe a long-term daily drinker undergoing unsupervised withdrawal; in a medical detox the same biology is present but the symptoms are blunted by medication.
6–12 hours
Mild tremor in the hands, anxiety, sweating, restlessness, mild nausea, headache, and an elevated pulse. Many drinkers recognise this state because it is what the morning drink usually relieves.
12–24 hours
Symptoms intensify. Tremor becomes coarser; anxiety can escalate to panic. Some patients begin to experience mild perceptual disturbances — the sensation of insects on the skin, or auditory distortions — which are early warning signs that the nervous system is becoming destabilised.
24–72 hours
The peak risk window for seizures. Three to ten percent of unsupervised heavy drinkers will have a withdrawal seizure in this window. Blood pressure and pulse are significantly elevated. Insomnia is severe. Confusion may begin to appear.
72–96 hours
In approximately three to five percent of unsupervised cases, delirium tremens develops in this window. Symptoms include severe disorientation, vivid hallucinations, fever, and cardiovascular instability. This is a medical emergency.
Day 5–7
For most patients, acute symptoms begin to subside. Sleep starts to regularise. Appetite returns. The dangerous part of withdrawal is largely behind the patient.
Day 7–14 — post-acute
A second phase appears: low mood, intermittent cravings, cognitive dullness, irritability, and disrupted sleep. These post-acute symptoms can persist for weeks. They are not dangerous, but they are the clinical reason structured therapy and family work begin during this window — to give the patient a structured environment in which to ride them out.
What families will see, organised by system.
Physical
- Tremor (most reliably visible in the hands, especially in the morning)
- Sweating, particularly at night and on the face and palms
- Elevated pulse and blood pressure
- Nausea, vomiting, loss of appetite
- Headache, photophobia, generalised weakness
Neurological
- Disrupted sleep, vivid dreams, dreams about drinking
- Mild perceptual disturbances ("formication" — sensation of insects on skin)
- Auditory or visual distortions in moderate withdrawal
- Confusion, disorientation, and hallucinations in severe withdrawal
- Withdrawal seizures (typically generalised tonic-clonic, 24–48 hours in)
Psychological
- Acute anxiety and panic, often disproportionate to context
- Irritability and emotional volatility
- Difficulty concentrating; intrusive thoughts of drinking
- Profound restlessness and inability to settle
- Low mood that intensifies in the post-acute phase
Who needs medical detox, and why "moderate" is not the right yardstick.
The clinical decision about whether a patient needs medical detox is not made on the basis of how the family describes the drinking. It is made on the basis of pattern, duration, and prior withdrawal history. The criteria below are the ones an addiction psychiatrist will use.
- Daily heavy drinking — typically more than six to eight units per day — for months or years
- A history of any prior withdrawal symptom (tremor, anxiety, vomiting on missed doses)
- A prior withdrawal seizure or any episode of delirium tremens
- Co-occurring medical illness — particularly liver disease, cardiac disease, or diabetes
- Concurrent use of benzodiazepines, opioids, or other depressants
- Older age, malnutrition, or significant weight loss
What a benzodiazepine taper actually does.
The standard-of-care protocol for alcohol withdrawal uses benzodiazepines on a tapering schedule. Benzodiazepines act on the same GABA system that the alcohol acted on, producing a controlled, gradual handoff. The patient does not feel "high"; they feel stable. The dose is high at the start of detox — enough to suppress the hyperactivity that causes seizures — and steps down over five to ten days.
Alongside the taper, three other clinical priorities are continuous. Thiamine is supplemented because heavy drinkers are almost universally deficient and untreated deficiency causes Wernicke’s encephalopathy. Hydration and electrolytes are managed because acute withdrawal disrupts both. Vital signs and a withdrawal-severity score are checked every four to six hours through the acute window so that doses can be titrated to the actual physiology rather than to a textbook.
Done well, the patient experiences withdrawal as uncomfortable but not dangerous. Tremor is muted. Sleep is preserved. Anxiety is controlled. The patient remains conscious and oriented throughout, which is also what makes the transition into structured therapy at the end of detox seamless rather than wrenching.
The first week from the family’s side.
Most families ask, reasonably, what they will see and hear in the first week. The honest answer is: not very much, by design. During detox, the patient is largely resting and receiving medical care. Phone access is restricted because the patient needs sleep more than they need conversation. Family updates come daily through the care coordinator — vitals, mood, intake, sleep — but the patient is not on calls.
This restraint is not a policy of distance. It is the clinical reality that most patients in acute withdrawal feel weak, shaky, and emotionally raw, and do not want to be seen in that state by the people who love them. By day five to seven, the patient stabilises enough to begin structured therapy and family sessions — usually starting in week two — open as soon as the patient is ready to engage.