Alcoholic hallucinosis: what it is and how it manifests itself

Alcohol hallucinosis is a type of alcohol-induced psychotic disorder characterized by vivid auditory hallucinations, often threatening in nature, occurring during or shortly after heavy alcohol consumption, often accompanied by delusional ideas and severe anxiety, despite a relatively clear conscious state. In the classic form, the onset is associated with abstinence, and the phenomenology resembles schizophrenia-like psychosis; however, the course and prognosis are usually more favorable with sustained abstinence. [1]

Historically, the term described "drunken hallucinosis" with a predominance of acoustic verbal voices, sometimes "commenting" on the patient's actions. Today, the diagnostic framework has been shifted to the "alcohol-induced psychotic disorder" block with the "with hallucinations" subtype in the International Classification of Diseases, Eleventh Revision, which helps to more accurately distinguish this syndrome from delirium and primary psychoses. [2]

The clinical significance of this condition is high: episodes are accompanied by a risk of self-harm, impulsive aggression, and repeated hospitalizations, especially in patients with a long history of abuse and social stressors. Early recognition allows for rapid treatment of psychosis, the prevention of somatic complications, and the initiation of a relapse prevention program. [3]

Comprehensive management includes acute safety, metabolic support with thiamine, withdrawal treatment, short-term antipsychotic therapy, and subsequent rehabilitation with relapse prevention methods for alcohol dependence. This stepwise approach reduces the duration of psychosis and decreases the likelihood of relapse. [4]

Code according to ICD-10 and ICD-11

In the International Classification of Diseases, Tenth Revision, alcohol-induced psychotic disorder is classified under the heading F10.5, which includes separate entries for "with delusions" and "with hallucinations" for different clinical modifications. In clinical practice, the codes F10.151 for "alcohol abuse with alcohol-induced psychotic disorder with hallucinations" and F10.251 for "alcohol dependence with the same subtype" are encountered. [5]

The International Classification of Diseases, Eleventh Revision, introduced block 6C40.6 "Alcohol-induced psychotic disorder" with the following subtypes: 6C40.60 "with hallucinations," 6C40.61 "with delusions," 6C40.62 "with mixed psychotic symptoms," and 6C40.6Z "unspecified." These codes are applicable when symptoms are clearly linked to alcohol and when delirium and other causes have been excluded. [6]

Accurate coding is important for patient management, outcome monitoring, and rehabilitation planning. It is recommended that reporting include the stage of use, the episode trigger, and the presence of abstinence, as these parameters influence prognosis and the choice of interventions. [7]

Table 1. Codes for alcohol-induced psychotic disorder

Classification	Block	Subtype	Code
ICD-10	Alcohol-induced psychotic disorder	With hallucinations	F10.151, F10.251
ICD-10	Alcohol-induced psychotic disorder	With delirium	F10.150, F10.250
ICD-11	Alcohol-induced psychotic disorder	With hallucinations	6C40.60
ICD-11	Alcohol-induced psychotic disorder	With delirium	6C40.61
ICD-11	Alcohol-induced psychotic disorder	Mixed symptoms	6C40.62

Epidemiology

The incidence of alcoholic hallucinosis in the general population is low, but among people with alcohol use disorder, it is the second most common alcohol-related psychosis after delirium. Clinical series report a range of 0.5% to 10% among patients with alcohol dependence, reflecting differences in samples and diagnostic criteria. [8]

In some hospital observations, the proportion of patients with alcoholic hallucinosis among those hospitalized for alcohol use disorder reached approximately 12%, with an increased rate of lifetime re-admissions. These data highlight the need for long-term relapse prevention programs. [9]

Older reviews estimate prevalence at 0.6–0.7% among people with chronic alcoholism, likely reflecting underreporting and strict selection criteria. Contemporary studies show variability related to age, gender, and comorbidities. [10]

Some patients may develop primary psychosis spectrum disorders remotely after the episode, although most cases regress with sobriety. In one study, conversion to primary psychosis was approximately 13%, necessitating post-discharge monitoring. [11]

Reasons

The key causative factor is the toxic and neuromodulatory effects of ethanol and its metabolites on the central nervous system, with long-term restructuring of the inhibitory and excitatory systems. Withdrawal results in a rebound of excitation, creating the conditions for auditory hallucinations and delusional interpretations. [12]

Neuroinflammation, oxidative stress, and impaired plasticity in perceptual and belief-control networks support the persistence of symptoms in some patients, particularly during repeated withdrawal episodes and relapses. These mechanisms align the phenomenology with schizophrenia-like conditions with different etiologies. [13]

Somatic factors, including thiamine deficiency and electrolyte disturbances, exacerbate cognitive vulnerability and increase the likelihood of a mixed picture with delirium or seizures. Early metabolic correction reduces the severity of psychotic symptoms. [14]

Contributing factors include the duration of abuse, high total consumption volume, early age of onset, and co-morbid mental disorders, including anxiety and depression, which increases the need for alcohol as a “self-medication.” [15]

Risk factors

Middle-aged men with a long history of harmful use, early onset, and severe dependence are at increased risk; this group is more likely to experience psychotic episodes during withdrawal. Social instability, stressful events, and lack of support increase vulnerability. [16]

Biological risk factors include vitamin B1 deficiency, malnutrition, dehydration, sodium, potassium, and magnesium imbalances, as well as the consequences of traumatic brain injury and vascular comorbidity. These conditions worsen the clinical picture and complicate detoxification. [17]

The risk of relapse increases in the absence of rehabilitation programs, poor adherence, and the presence of environmental triggers. Repeated hospitalizations are often associated with gaps in relapse prevention therapy rather than with psychosis "resistance." [18]

Intercurrent conditions such as somatic infections or trauma may trigger or intensify psychotic experiences during alcohol withdrawal, requiring careful assessment with each recurrent episode.[19]

Table 2. Risk factors and evidence base

Factor	Confirmed connections
Long-term and heavy use	Increased risk of psychosis with alcohol withdrawal. [20]
Early age of onset	More severe course and psychotic symptoms. [21]
Thiamine deficiency and nutritional deficiencies	Worsening of cognitive vulnerability and delirium. [22]
Electrolyte disturbances	Convulsions, deterioration of mental status. [23]

Pathogenesis

The leading role belongs to the dysregulation of gamma-aminobutyric and glutamate transmission: against the background of chronic alcohol intake, inhibition predominates, and with abrupt withdrawal, hyperexcitation, which manifests itself as anxiety, insomnia, sensory distortions and acoustic hallucinations. [24]

Increased dopamine activity in mesolimbic pathways promotes the attribution of "inappropriate significance" to internal and external stimuli, forming delusional ideas and maintaining "voices." This hypothesis is consistent with the effect of antipsychotics on symptom relief. [25]

Neuroinflammatory processes and stress reactivity increase sensitization to withdrawal, so repeated relapses increase the likelihood of prolonged episodes. Associated somatic vulnerabilities, including B vitamin deficiency, aggravate the course of the illness. [26]

The preservation of consciousness and orientation in alcoholic hallucinosis is explained by the fact that the networks of perception and belief are primarily affected, rather than the global mechanisms of wakefulness, as in delirium. This is an important differential feature. [27]

Symptoms

Auditory hallucinations predominate—most often verbal, "commenting" or commanding, with frightening content. Interpretations of persecution and guilt are often added, but the level of consciousness usually remains clear, unlike in delirium. [28]

Anxiety, insomnia, intense alertness, and hyperreactivity to sounds and movements intensify the suffering, creating a vicious cycle. Without intervention, this perpetuates the hallucinatory flow and increases the risk of impulsive actions. [29]

The onset often occurs 1-3 days after a sharp reduction in alcohol doses or cessation of intake, and may be accompanied by somatic signs of withdrawal - tremors, sweating, tachycardia, autonomic instability. [30]

For some patients, the episode is limited to days or weeks, while for others it can be prolonged, especially with repeated relapses and the absence of relapse prevention therapy. The presence of depression increases the risk of suicidal behavior and requires concurrent management. [31]

Classification, forms and stages

According to the International Classification of Diseases, Eleventh Revision, the following subtypes are distinguished: "with hallucinations," "with delusions," and "with mixed psychotic symptoms." Alcoholic hallucinosis belongs to the first subtype, with a predominance of auditory phenomena and the absence of other psychotic features. [32]

Depending on the course of the illness, a distinction is made between an acute episode, which develops rapidly against the backdrop of withdrawal, a subacute form with a slower progression, and a protracted form with symptoms persisting for weeks with incomplete remission. The latter is more often observed in cases of long-term addiction. [33]

The stages include a prodrome (sleep disturbance, anxiety), a full-blown psychotic phase (verbal hallucinations, delusional interpretations), and a resolution phase with therapy and sobriety. Disruption of the regimen and stressful triggers delay regression. [34]

Table 3. Clinical forms and course characteristics

Form	Leading signs	Typical trigger	Expected move
With hallucinations	Acoustic "voices", commentary	Abstinence	Often a sharp debut
With mixed symptoms	Hallucinations plus delirium	Repeated breakdowns	Intermittent
Protracted	Persistence of hallucinations for weeks	Long-term addiction	Slow resolution

Complications and consequences

The main risks are impulsive aggression, self-harm, domestic trauma, and social consequences. The presence of "commanding" voices increases the likelihood of dangerous behavior, so an initial safety assessment is essential. [35]

Somatic complications include dehydration, electrolyte disturbances, seizures, and Wernicke's encephalopathy due to thiamine deficiency. These complications worsen outcomes and require protocol-based prevention and early intervention. [36]

Repeated episodes lead to loss of employment, disruption of family relationships, and repeated hospitalizations. Integrated programs with rehabilitation and family support reduce the risk of chronicity and improve quality of life. [37]

Table 4. Frequent complications and targeted preventive measures

Complication	Clinical significance	Prevention
Impulsive actions	Risk of injury and violence	Early safety assessment, hospitalization as indicated
Wernicke's encephalopathy	Acute cognitive impairment	Thiamine before or simultaneously with carbohydrates
Withdrawal cramps	Respiratory hazard and injury	Benzodiazepines by withdrawal severity
Social maladjustment	Loss of job and home	Long-term rehabilitation and social support

When to see a doctor

Auditory hallucinations with threatening or commanding content, severe anxiety, aggression, suicidal thoughts, and any signs of danger to oneself or others require immediate assistance. In such situations, emergency hospitalization is advisable. [38]

If symptoms arise due to sudden alcohol withdrawal, hospitalization helps safely detoxify, correct electrolytes, and prevent neurological complications. Home monitoring is unsafe in severe cases. [39]

For recurring episodes of hallucinations, even without pronounced aggression, a scheduled consultation with a psychiatrist and addiction specialist is recommended to establish relapse prevention therapy and family support. Early intervention improves the prognosis. [40]

Signs of a somatic threat include confusion, unsteadiness of gait, nystagmus, uncontrollable vomiting, and signs of dehydration. These symptoms indicate a possible thiamine deficiency and require immediate administration of vitamin B1. [41]

Diagnostics

The diagnosis is suggested by the presence of acoustic verbal hallucinations and/or associated delusional interpretations with a temporal connection to alcohol consumption or abstinence in a relatively clear state of consciousness. It is important to confirm the temporal connection and exclude delirium. [42]

The laboratory block includes a complete blood count, biochemistry panel, glucose, electrolytes, liver and kidney function tests, pregnancy screening in women as indicated, toxicology screening, and examination for dehydration and autonomic instability. These data determine the scope of emergency treatment. [43]

Instrumental studies are prescribed according to indications: computed tomography or magnetic resonance imaging of the brain in case of atypical onset, trauma, focal deficit, old age; electroencephalography - if seizure activity is suspected. [44]

Table 5. Diagnostic algorithm for suspected alcoholic hallucinosis

Step	Action	Target
1	Safety assessment, need for hospitalization	Prevent injuries
2	Collecting a history of use and the temporal relationship of symptoms	Confirm the induced nature
3	Physical examination and vital signs	Identify somatic threats
4	Laboratory tests and toxicology	Determine the amount of correction
5	Neuroimaging as indicated	Rule out organic causes
6	Psychiatric interview	Describe the phenomenology and risks

Differential diagnosis

The main difference from delirium during withdrawal is the preservation of clear consciousness and attention in alcohol hallucinosis. In delirium, fluctuations in wakefulness, disorientation, and pronounced autonomic instability predominate, requiring different tactics and intensity of observation. [45]

It is necessary to distinguish it from primary psychotic disorders, when psychosis is not temporally associated with episodes of alcohol consumption or persists despite stable sobriety. Long-term observation after the acute phase has subsided helps to identify rare cases of conversion. [46]

Psychoses due to other substances are excluded based on toxicology and anamnesis data, as well as organic causes - trauma, tumors, vascular events, epilepsy, especially with late onset and focal neurological symptoms. [47]

Treatment

The first stage is ensuring safety: assessing the risk of self-harm and violence, and, if necessary, hospitalizing with observation. Monitoring of vital signs, oxygen saturation, temperature, and blood glucose levels begins in parallel, with correction of any identified abnormalities. [48]

Metabolic support includes prompt intravenous thiamine administration before or simultaneously with carbohydrate-containing solutions, rehydration, and electrolyte replacement. This is key to preventing Wernicke encephalopathy and improving cognitive outcomes. [49]

Withdrawal is treated with benzodiazepines, titrating the dose according to severity scales until autonomic hyperactivity is relieved and seizures and delirium are prevented. In severe cases, intensive care protocols may be necessary; in cases of liver damage, drugs with less pronounced hepatic metabolism are preferred. [50]

To reduce psychotic symptoms, antipsychotic medications are used in short courses at low to moderate doses, with monitoring for side effects and the risk of QT prolongation. The goal is to reduce the intensity of "voices" and anxiety to a level that allows for continued detoxification and psychotherapy. [51]

After stabilization, anti-relapse pharmacotherapy for alcohol dependence is recommended: naltrexone or acamprosate as first-line agents, selected taking into account liver and kidney function, comorbid depression, and patient preferences. This reduces the frequency of recurrent episodes and hospitalizations. [52]

The psychotherapeutic package includes motivational interviewing, cognitive-behavioral approaches, self-regulation skills training, family therapy, and support groups. Family involvement increases adherence, reduces stigma, and helps manage triggers. [53]

In cases of concomitant depression or anxiety, antidepressants and anxiolytics are considered, taking into account interactions and the risk of abuse. The decision is made after the acute phase has concluded, when withdrawal is controlled and the risk of delirium is minimal. [54]

In patients with repeated relapses, structured relapse prevention plans are helpful: individualized early warning markers, crisis contacts, agreements with loved ones about safe behavior, and rapid access to medical care at the first symptoms. [55]

In some inpatient settings, benzodiazepine-sparing regimens with the addition of adjuvants are being discussed in selected patients, however, they do not replace standards and should be used with caution given the evidence and safety profile.[56]

Table 6. Stages of therapy and target results

Stage	Measures	Expected effect
Emergency security	Hospitalization according to indications, monitoring	Injury prevention
Metabolic support	Thiamine, rehydration, electrolyte correction	Prevention of encephalopathy and seizures
Abstinence control	Benzodiazepines by severity	Reduction of autonomic hyperactivity
Treatment of psychosis	Short-term antipsychotics	Reducing "voices" and anxiety
Prevention of relapse	Naltrexone or acamprosate, psychotherapy	Reduction in recurrent episodes

Prevention

Primary prevention focuses on reducing harmful alcohol use in the population, screening in primary care, early motivational interviews, and rapid referral to treatment programs. This reduces the risk of a first psychotic episode. [57]

Secondary prevention after an episode includes maintenance pharmacotherapy for addiction, regular psychotherapy, family education, and a relapse prevention plan. Emphasis is placed on recognizing early signs of withdrawal and promptly seeking treatment. [58]

Nutritional prophylaxis – correction of thiamine and other B vitamin deficiencies, adequate protein and micronutrient intake, which reduces the likelihood of neurological complications and improves recovery. [59]

Organizational measures – access to rehabilitation, employment and housing support, dealing with legal consequences – reduce social risk factors, stabilizing remission. [60]

Forecast

With adequate emergency management and sustained abstinence, acute episodes often regress within days or weeks. A favorable outcome is more likely with early initiation of therapy, comprehensive abstinence management, and the inclusion of relapse prevention methods. [61]

The prognosis worsens with prolonged abuse, repeated relapses, severe somatic comorbidities, and a lack of family support. In such cases, the risk of protracted or recurrent episodes is higher. [62]

A small proportion of patients may eventually progress to primary psychotic disorders, which requires outpatient monitoring after symptom relief and flexible adjustment of the treatment plan. [63]

Comprehensive rehabilitation programs with pharmacotherapy for addiction, psychotherapy, and social support demonstrate better long-term results in terms of quality of life and reduced rehospitalizations. [64]

FAQ

Can alcoholic hallucinosis be confused with delirium?
Yes, but with hallucinosis, consciousness is usually clear, while with delirium, attention and wakefulness are impaired; management tactics and the intensity of observation differ. [65]

Is thiamine needed before carbohydrates?
Yes, thiamine is administered intravenously before or simultaneously with carbohydrates to reduce the risk of Wernicke encephalopathy in patients with deficiency. [66]

Are antipsychotic medications always necessary?
Often, a short course of low to moderate doses is required to reduce the intensity of the "voices," along with treatment for withdrawal symptoms and correction of metabolic disturbances. [67]

How can the risk of relapse be reduced?
Supportive care for addiction, psychotherapy, relapse prevention plans, family involvement, and social support have been shown to significantly reduce relapse rates. [68]

How long does an episode last?
With treatment and sobriety, it is most often days or weeks; without intervention and with repeated relapses, the risk of a protracted course increases. [69]