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Therapy
Benzodiazepines
Benzodiazepines (BZDs) act by modulating the binding of GABA to the GABA‐A receptor, increasing the influx of chloride ions and providing an inhibitory effect which is similar to that of ethanol. Therefore, BZDs replace the repressive effect of ethanol that has been discontinued in AWS. Most BZDs are extensively and rapidly absorbed after oral administration, with bioavailability varying from 80% to 100%. They rapidly penetrate the blood–brain barrier, although the diffusion rate into the brain and other tissues varies and is largely determined by lipophilicity. All BZDs are metabolized in the liver by oxidation and/or glucuronidation, and some of them form pharmacologically active metabolites that are responsible for the long duration of action, such as diazepam, chlordiazepoxide, and clorazepate. Therefore, the BZDs and their active metabolites may be categorized according to the duration of their effect: short acting (<10 h like lorazepam, oxazepam, and midazolam), intermediate acting (10–24 h as clonazepam), or long acting (>24 h; clobazam, clorazepate, and diazepam).. The metabolism of BZDs is primarily catalyzed by CYP isoenzymes which may be the target of drug–drug interactions, sometimes leading to paradoxical effects or over sedation. When associated with paradoxical excitement, BZDs may contribute to seizure exacerbation when tapered, particularly after prolonged use.
BZDs are currently recognized as first‐line treatment for AWS. Their effectiveness to significantly reduce the risk of recurrent seizures related to alcohol withdrawal compared to placebo has been demonstrated many years ago. Nevertheless, the available evidence does not suggest that benzodiazepines are clearly superior to other drugs with the exception of a possible advantage in seizure control and prevention when compared to non‐anticonvulsants and placebo. BZDs are recommended both for primary and secondary seizure prophylaxis in AWS. A structured guideline for the identification and management of alcohol‐related seizures (EFNS TaskForce, 2005) is currently being revised. Within the first 2 d of withdrawal, BZDs reduce the incidence of seizures by up to 84% and prevent the development of DT. The current literature does not suggest one BZD to be more efficacious than another, although differences in pharmacokinetic properties can guide selection. The following recommendations include agents
- with rapid onset to control agitation symptoms
- with long action to avoid breakthrough symptoms
- with less dependence on hepatic metabolism to lower the risk of over sedation
Diazepam fulfills the first two aspects and represents the primary choice. Increased age and liver disease significantly impact the CYP‐dependent metabolism of medications with a 50% decline in the clearance and a four‐ to ninefold increase in terminal half‐life of diazepam with accumulation and production of side effects. Therefore, in the elderly and patients with cirrhosis or severe liver dysfunction, lorazepam or oxazepam is preferred.

Strategies for the use of BDZ
Multiple dosing strategies have been utilized in the management of AWS. When using any dosing technique, it is important to recognize the symptoms of benzodiazepine toxicity that can include respiratory depression, excessive sedation, ataxia, confusion, memory impairment, and delirium, which may be difficult to differentiate from DT .
Loading dose regimen
The “front‐loading” or “loading dose” strategy uses high doses of longer‐acting benzodiazepines to quickly achieve initial sedation with a self‐tapering effect over time due to their pharmacokinetic properties. Typically, diazepam 10–20 mg or chlordiazepoxide 100 mg doses are repeated every 1–2 h until the patient reaches adequate sedation with an average of three doses usually required. Studies found diazepam loading to significantly reduce the risk of complications, to reduce the total dose of benzodiazepines needed, and the duration of withdrawal symptoms. A further benefit of this approach is that intensive monitoring and medication administration are limited to the early period of withdrawal. As the loading dose regimen may cause sedation and respiratory depression, withdrawal severity and the clinical condition need to be monitored prior to each dose to avoid benzodiazepine toxicity. This is especially important in elderly patients and those with hepatic dysfunction.
Fixed‐dose application
The “fixed‐dose” technique implies that a certain amount of medication is administered at regular intervals. This approach may be beneficial for patients who will require medication regardless of symptoms, such as in those with a history of seizures or DT.3 Fixed‐schedule dosing is often the only way to treat patients withdrawing from alcohol with comorbid medical illnesses or SE because of inability to assess withdrawal symptoms. Other advantages are less frequent reassessments of symptoms and fewer protocol errors in comparison with the symptom‐triggered therapy.Chlordiazepoxide and diazepam remain the agents of choice because of their long‐acting nature. A ceiling dose of 60 mg of diazepam or 125 mg of chlordiazepoxide is advised per day. After 2–3 d of stabilization of the withdrawal syndrome, the benzodiazepine is gradually tapered off over a period of 7–10 d.The peril of the fixed‐dose regimen is seen in under‐ or overestimation of the total dose; the latter is often seen in patients who are still alcohol intoxicated where unpredictable interactions with BZD may emerge.
Symptom‐triggered treatment
For this approach to be successful, patients must be symptomatic and there must be regular assessment of patient’s withdrawal symptoms using a validated tool like the CIWA‐Ar scale. Therefore, this regimen requires close monitoring. For this reason, the technique is not applicable in non‐verbal patients, and it is not safe in patients with a past history of withdrawal seizures because they can occur even without AWS symptoms. Using CIWA‐Ar, the cutoff for beginning treatment is a score of at least 8 resulting in the application of 5–10 mg diazepam or 25–100 mg chlordiazepoxide. Assessment should be repeated 1 h later. If symptoms persist, doses are repeated hourly until the score is below 8. Once stable, patients can be assessed every 4–8 h for additional therapy. The symptom‐triggered approach is as efficacious as the fixed‐dose method in managing alcohol withdrawal in terms of efficacy and incidence of adverse events.The advantages of symptom‐triggered therapy are shorter duration of detoxification, lower doses of BZD required, less sedation, and decreased risk of respiratory depression.
Non‐benzodiazepines
Antipsychotic agents
Although they may reduce symptoms of withdrawal, antipsychotics including phenothiazines and butyrophenones, like haloperidol, are associated with higher mortality due to cardiac arrhythmia by prolongation of the QT interval. Furthermore, they lower the seizure threshold. Therefore, antipsychotic agents should be used cautiously in AWS, particularly in its early stage (<48 h) when the seizure risk is high. Nevertheless, they may be considered as adjunctive therapy to benzodiazepines in the late stage of AWS, when agitation, delirium, and hallucinations are not controlled with BZD alone.

Antiepileptic agents
Seven randomized controlled studies, including over 600 patients, have investigated the effectiveness of carbamazepine (CBZ) in comparison with BZD. At daily doses of 800 mg with either a fixed or a tapered regimen over 5–9 d, CBZ was well tolerated and reduced withdrawal symptoms. Nevertheless, due to underenrollment, delayed medication administration, insufficient sample size, and inadequate dosage, the impact of CBZ to prevent seizures or DT is still uncertain and effectiveness compared to BDZ has not been verified. A retrospective analysis of over 700 patients comparing CBZ to valproate (VPA) found VPA to offer some benefits compared to CBZ, such as favorable tolerability and shorter duration of treatment. However, because of the study design and the lack of comparison to BZD, the study did not support implementation into clinical routine. Concerning gabapentin, there were similar results with some effects on mild/moderate withdrawal symptoms but no superiority to BZD.
As levetiracetam (LEV) has no significant affinity to GABAergic and glutamatergic receptors, its mechanism of action in AWS is still unclear. LEV represents a pyrrolidine derivate with binding to the synaptic vesicle protein SV2A, hereby regulating calcium‐dependent neurotransmitter release. Thus, it might reduce excessive neuronal activity and may exert neuroprotective effects. Due to its high tolerability and advantageous pharmacokinetics with lack of drug–drug interactions, LEV appears to be a promising agent in the therapy of AWS. The few available data have shown that the treatment with LEV resulted in a rapid and stable clinical improvement of AWS. Its usefulness in AWS treatment still needs to be investigated.
In summary, besides BZD, anticonvulsants seem to be widely used for the treatment of AWS. Nevertheless, a Cochrane review investigating 56 studies with a total of 4076 participants found no sufficient evidence in favor of any antiepileptic agent for therapy of AWS.
Alpha‐2 agonistic agents
Dexmedetomidine (DEX), a more potent ɑ‐2 agonist than clonidine, decreases sympathetic overdrive and release of norepinephrine. Due to its rapid onset of action and short half‐life, it produces a “cooperative sedation” without necessity for intubation. As ɑ‐2 agonists lack the GABAergic activity to prevent and treat DT or seizures, they can only be used as adjunctive therapy to reduce autonomic hyperactivity that cannot be controlled by BZD alone. Several studies demonstrated a BZD‐sparing effect with significant reduction in BZD requirement.
Anesthetic agents
Propofol
Propofol enhances the inhibitory effects at the GABA‐A receptor and decreases excitatory circuits of the NMDA transmitter system. Due to its strong lipophilic properties, it features a rapid onset of action and is easy to titrate because of the short half‐life. Propofol has general anesthetic effects that often require intubation and mechanical ventilation. Its use is therefore restricted to the intensive care unit making this agent an adjunct therapy for refractory cases of AWS.Its application and experience in AWS is limited to only a few cases and rebound of withdrawal symptoms soon after stopping propofol infusion has been reported.
Barbiturates
Barbiturates are also GABA‐enhancing drugs that work synergistically with BZD featuring a different receptor profile. They can be given orally or intravenously with a loading dose of 100–200 mg/h and have been shown to be as effective as BZD. Unfortunately, barbiturates have a narrow therapeutic index with a long half‐live making titration difficult. They increase the likelihood of respiratory insufficiency and coma so that intubation and mechanical ventilation is often necessary. Because there is no antidote to toxicity, barbiturates are not used frequently in the therapy of AWS.
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Others
Clomethiazole
As the parenteral form of clomethiazole is no longer available, its application is dependent on sufficient alertness and cooperation to enable peroral treatment. For adequate alleviation of delirious symptoms, 200 mg capsules are administered (maximum 24 capsules per day) and doses are repeated every 2–3 h until sufficient calming. As with BZDs, CNS respiratory center depression may emerge, especially in combination with BZDs, whose daily doses should be reduced to 15–20%. Further side effects of clomethiazole are an increased risk of pneumonia due to bronchial mucus accumulation as well as dependence, so that administration should not exceed 10 d. Moreover, clomethiazole is subjected to a pronounced first pass effect by the isoenzyme CYP2E1 which is blocked by ethanol consumption. Accordingly, the combinatory intake of clomethiazole and ethanol should be avoided due to its possible life‐threatening effects.
Gamma‐hydroxybutyric acid (GHB) and Sodium oxybate (SMO)
GHB, admitted to the treatment of narcolepsy, is an endogenous neurotransmitter and a metabolite of GABA. It has a stake in GABA‐dependent neurotransmission, dopamine release, and thereby, it regulates the wake–sleep cycle. GHB acts as a depressant at higher doses and has anxiolytic properties. A Cochrane review shows impact on symptoms of alcohol withdrawal in comparison with placebo, but no superiority to BZDs or clomethiazole in prevention of AWS with a high risk of misuse, abuse, and addiction. SMO is the sodium salt of γ‐hydroxybutyric acid, a naturally occurring short‐chain fatty acid that is structurally similar to GABA. In addition to the activation of the GABA‐A receptor, it has also alcohol mimicking effects due to dopamine release in the CNS. There are some studies showing SMO to be equally effective as BZD in moderate‐to‐severe AWS.When used for a short period, SMO is relatively well tolerated; in long‐term use, there is, as is known for GHB, concern about abuse and dependence based on its euphoric properties.
Baclofen
Baclofen, a GABA‐B receptor agonist and a well‐known muscle relaxant for treatment of spasticity, has similar mechanisms of action and similar effects as SMO. Consistent with preclinical evidence, open‐label reports demonstrated the ability of baclofen to rapidly reduce symptoms of severe AWS and to decrease craving. Due to only a few trials, there is not enough evidence to recommend its use.
Adjunctive Therapeutic Agents
Magnesium
Magnesium is an important cofactor of many enzymes and acts as an inhibitor of neurotransmitter release. Therefore, it may dampen the NMDA‐driven hyperexcitability in AWS by competing with glutamate in its receptor binding site. Furthermore, magnesium impedes the NO synthase and calcium‐dependent channels, lowering action potential firing. As chronic alcohol use is associated with abnormal magnesium metabolism, patients have been given magnesium to treat or prevent AWS. Based on a Cochrane review, there is currently insufficient evidence to support the routine use of magnesium for prophylaxis or treatment of AWS. Nevertheless, as alcohol use and withdrawal are connected with QT interval prolongation and cardiac arrhythmia, laboratory values of magnesium should be determined and deficiencies be balanced.
Thiamine
Wernicke’s encephalopathy (WE) is afflicted with high morbidity and mortality and presents only in rare cases with the classic triad of confusion, ataxia, and ophthalmoplegia. According to the EFNS guideline for diagnosis of WE, two of the following four signs are required: (i) dietary deficiencies, (ii) eye signs, (iii) cerebellar dysfunction, and (iv) either an altered mental state or mild memory impairment. Particularly in severe AWS with predominant symptoms of DT, differentiation from WE is sometimes impossible. Because of its easy and uncomplicated treatment, prevention of WE with parenteral thiamine should be performed in all patients at risk, including those experiencing AWS and prior to any parenteral carbohydrate‐containing fluids. The earlier thiamine supplementation is started, the faster is recovery, regardless of initial clinical presentation.

Conclusions
Alcoholics are a diverse group. They experience different subsets of symptoms, and the disease has different origins and modulating influences for different people. Therefore, to understand the effects of alcoholism, it is important to consider the influence of a wide range of variables on a particular behavior or set of behaviors. The underpinnings of alcohol-induced brain defects are multivariate; to date, the available literature does not support the assertion that any one variable can consistently and completely account for these impairments. Instead, the identification of the most salient variables is a primary focus of current research. In the search for answers, we recommend an integrative approach that recognizes the interconnectivity of the different functional systems to account for the heterogeneity of outcome variables associated with alcoholism-related impairments and recovery of functions. It is helpful to use as many kinds of tools as possible, keeping in mind that specific deficits can be observed only with certain methods, with rigorous paradigms, and with particular groups of people with distinct risk factors. Such confluence of information can provide evidence linking structural damage, functional alterations, and the specific behavioral and neuropsychological effects of alcoholism. These measures also can determine the degree to which abstinence and treatment result in the reversal of atrophy and dysfunction.
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