Antalcol

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Antalcol

Treatment option: Alcoholism

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Antalcol

What is Antalcol? (Disulfiram)

Property Description
Active ingredient Disulfiram (Tetraethylthiuram disulfide)
Form Oral preparation (Tablets, effervescent tablets)
Pharmacological class Alcohol Deterrent Agent
Common use Maintenance of abstinence in chronic alcohol dependence
Origin Synthetic Compound

What Type of Medicine is Antalcol? (Identity and Classification)

Antalcol is a systemic anti-alcoholic preparation that contains the sole active ingredient, Disulfiram, and belongs to the pharmacological class of alcohol deterrent agents. Its core composition is a synthetic compound, chemically identified as tetraethylthiuram disulfide. The medicine is utilized as a distinct pharmacological tool in the comprehensive management of chronic alcohol dependence. Antalcol is manufactured primarily as an oral preparation, such as tablets, intended for oral administration. Its formulation as a single-ingredient product focuses all therapeutic activity on the properties of Disulfiram, offering a clear and specific mechanism of action suitable for the adult patient population.


What is the General Purpose of Taking Disulfiram? (Function and Benefit)

The general purpose of Disulfiram is to support individuals in the crucial goal of maintaining abstinence from alcohol by creating a powerful chemical deterrent. The core mechanism relies on disrupting the body's normal metabolism of alcohol (ethanol). It specifically inhibits the enzyme Aldehyde Dehydrogenase (ALDH), which is essential for clearing the toxic metabolite acetaldehyde. The accumulation of acetaldehyde triggers the intensely uncomfortable "Disulfiram-Ethanol Reaction," which is the intended consequence of this highly specific pharmacological approach, serving as a non-negotiable chemical deterrent against relapse.


Antalcol and its Unique Pharmacological Role

Disulfiram's mode of action is fundamentally different from other pharmacological strategies for alcohol use disorder because its effect is based on creating aversion rather than reducing craving. This distinct approach provides a direct chemical consequence, contrasting with agents that primarily modulate brain pathways to lessen psychological desire. Disulfiram, as an aversive treatment, remains a unique option for those motivated toward complete abstinence. Its mechanism functions as a direct pharmacological application of aversion therapy, a feature that sets it apart in the treatment landscape.

What side effects are possible with Antalcol?

Possible side effects and safety information

The safety profile for Antalcol (Disulfiram) is defined by two primary regulatory concerns: the intended, potentially severe reaction to alcohol, and the risk of systemic adverse reactions, particularly affecting the liver and nervous system.

Category Description
Adverse reaction scope Intended severe reaction to alcohol (Disulfiram-Ethanol Reaction), Hepatotoxicity (liver damage), and Neurotoxicity (nerve/eye damage).
Common / Transient Effects Mild headache, drowsiness, fatigue, skin rash, acneiform eruptions, and a metallic or garlic-like aftertaste are frequently reported and often transient during the initial phase of therapy.
System-organ classes involved Reactions are documented across the Nervous System (neuritis, neuropathy), Hepatobiliary System (hepatitis, liver failure), Skin, and Psychiatric Systems (psychotic reactions) in official labeling.
Serious adverse reactions The highest safety concern is the Disulfiram-Ethanol Reaction (DER), which, upon alcohol exposure, can lead to severe cardiovascular events, respiratory depression, convulsions, and death. Rare, but serious, systemic risks include hepatic failure (including fatal hepatitis) and optic or peripheral neuritis [FDA/MedlinePlus].
Population-specific safety Safety and effectiveness are not established in pediatric patients. The drug is contraindicated in the presence of severe myocardial disease, coronary occlusion, or psychosis. Use requires extreme caution in patients with hepatic impairment, and liver function monitoring is noted in regulatory documents.
Exposure-related patterns The full risk of the DER may persist for up to 14 days after the final dose. Severe hepatic toxicity, including fatal hepatitis, has been reported to develop even after many months of therapy [FDA/NIH].

Resulting Safety Structure

The regulatory safety profile emphasizes that the serious consequences of consuming alcohol while taking the medicine are an expected, but life-threatening, outcome. Beyond this, the labeling requires vigilance for non-alcohol-related systemic toxicity, specifically in the liver and nervous system. The official restrictions establish clear, high-level safety constraints for patients with pre-existing heart disease or psychoses.

Overdose and Emergency Response

Overdose and when to seek help

The following information details the officially documented manifestations of overdose and the regulator-mandated conditions under which emergency medical help must be sought.

Feature Official Regulatory Guidance
Documented Overdose Presentations Acute overdose of Disulfiram alone is chiefly associated with neurological symptoms, including drowsiness, confusion, delirium, hallucinations, headache, and sometimes seizures or prolonged coma. Systemic signs documented include tachycardia, hypotension (low blood pressure), and hyperthermia (elevated body temperature) [Source 2.1].
Dose/Exposure Factors Ingestion of 2.5 g or more has been associated with toxicity in children. The Disulfiram-Ethanol Reaction (DER), which is a critical concern, is proportional in severity to the amount of alcohol consumed and can be triggered by even small amounts of alcohol-containing products [Source 1.2, 2.4].
When Immediate Help is Required Call emergency services (e.g., 911) immediately if the person has collapsed, had a seizure, has trouble breathing, or cannot be awakened [Source 1.3]. For any suspected overdose, it is recommended to contact the local poison control center [Source 1.5].
Supportive Management Management is strictly symptomatic and supportive, as no specific antidote is known. Procedures such as gastric lavage or activated charcoal may be considered, and measures to counteract hypotension may be required [Source 1.4, 1.5].
Population-Specific Notes Hypotonia (reduced muscle tone) may be a prominent sign of acute overdose in children. The risk of severe, life-threatening reactions is heightened for patients with pre-existing conditions like cardiac disease, epilepsy, or hepatic impairment [Source 2.1, 2.2].

The official overdose profile details the clinical signs of acute ingestion and the severe systemic risks, particularly the potential for cardiovascular collapse. This severity necessitates that patients always carry an identification card detailing the medication and emergency contact information, establishing a clear regulatory threshold for mandatory help-seeking [Source 2.6].

Therapeutic Uses of Antalcol

What Antalcol Treats: Main Uses and Benefits

Antalcol (Disulfiram) is a prescription medication used as part of a comprehensive program for treating Alcohol Use Disorder (AUD), which is also referred to as chronic alcoholism. As it is not a cure, it is used to help manage the risk of drinking by creating a deterrent to alcohol consumption.


Sustaining Complete Abstinence from Alcohol

Antalcol's primary therapeutic use is to provide robust support for the maintenance of abstinence in individuals with chronic alcohol dependence. It is relevant in the context of chronic dependence and addresses the behavioral symptoms related to recurrent alcohol consumption and the risk of impulsive relapse, which may interfere with recovery efforts. It is commonly used to help manage the risk of drinking episodes characteristic of moderate to severe AUD. These indications include supporting long-term sobriety, managing the risk of relapse episodes, and assisting with the choice of alcohol avoidance.


Pharmacological Support for Recovery Commitment

This medication generally plays a role in managing sobriety within a comprehensive treatment plan. The medication may assist with establishing a consistent external boundary against alcohol use, which contributes to improved comfort and supports the patient during episodes of heightened discomfort that interfere with routine activities.


Quick Fact: Relief for Risk of Relapse Antalcol supports patients by providing a pharmacological deterrent that helps manage the risk of recurring alcohol consumption, which is a key challenge in maintaining long-term functional stability.

Regulatory References

  1. NIH MedlinePlus overview of Disulfiram

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Antalcol (Disulfiram) — Official Regulatory Information

This section describes the populations permitted or prohibited from using this medicine, strictly based on official governmental regulatory documentation.


Eligibility Scope

Category Official Regulatory Status/Statement
Populations for whom use is allowed Adults with chronic alcohol dependence who have been abstinent from alcohol for at least 12 hours prior to treatment initiation.
Populations for whom use is not recommended Children and adolescents under 18 years of age (safety and effectiveness not established). Nursing mothers (excretion into human milk is unknown).
Populations for whom use is contraindicated Patients in a state of alcohol intoxication or who have consumed alcohol within the previous 12 to 24 hours. Individuals with severe myocardial disease or coronary occlusion, manifest psychoses, or uncompensated heart failure. Patients receiving or who have recently received Metronidazole or Paraldehyde.

Age- and Condition-Based Eligibility Rules

  • Pediatric Use: Safety and effectiveness have not been established in pediatric patients.
  • Older Adults: Use requires caution due to the greater frequency of decreased organ function in this age group.
  • Pregnancy Status: The safe use of this drug in pregnancy has not been established. Use during pregnancy is generally not advised and is only considered when the probable benefits outweigh the possible risks.
  • Condition-Based Caution: Use must be with extreme caution in patients with a history of Epilepsy, Diabetes Mellitus, Hypothyroidism, Chronic Nephritis, or Hepatic insufficiency.

Connection to the overall eligibility profile:

Official regulatory documents define the eligible population for Antalcol (Disulfiram) as adults committed to abstinence who are free from specific severe contraindicating conditions, primarily related to the cardiovascular and central nervous systems. Eligibility is constrained by the absolute necessity of alcohol avoidance and prohibitions against use in severe heart disease, psychosis, and while taking specific medications.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Antalcol (Disulfiram) has several documented interactions with other medicines and products, primarily resulting from its effect as an enzyme inhibitor.

Contraindicated Combinations

Concomitant use is prohibited for the following:

  • Alcohol (Ethanol): All forms of alcohol, including alcoholic beverages and products containing trace amounts of alcohol (e.g., cough syrups, certain foods, topical preparations), are strictly forbidden. Ingestion of alcohol causes the severe Disulfiram-Ethanol Reaction (DER).
  • Metronidazole: Combination is contraindicated due to the risk of psychotic reactions and confusion.
  • Paraldehyde: Contraindicated due to the risk of increased paraldehyde blood levels and resulting toxicity.

Significant Drug-Drug Interactions

Antalcol is an inhibitor of certain Cytochrome P450 (CYP) enzymes in the liver, leading to decreased metabolism and increased plasma concentrations of several co-administered drugs. Such combinations require close therapeutic monitoring and dosage adjustment by a healthcare professional.

Interacting Medicine/Class Resulting Effect Constraint/Monitoring
Oral Anticoagulants (e.g., Warfarin) Increased anticoagulant effect and risk of bleeding. Frequent monitoring of INR/prothrombin time required.
Phenytoin, Theophylline Increased plasma concentrations, risking toxicity. Serum drug level monitoring required.
Isoniazid Increased risk of central nervous system effects (e.g., confusion, psychosis). Discontinuation of Antalcol may be necessary.

Disulfiram should not be administered for at least 12 hours after the ingestion of alcohol. The risk of the DER persists for up to 14 days after discontinuation of Antalcol therapy.

Mechanism of Action

How Antalcol Works — Mechanism of Action

The action of Antalcol (Disulfiram) centers on the irreversible inhibition of the enzyme Aldehyde Dehydrogenase (ALDH) , which catalyzes the oxidation of acetaldehyde into acetate. This primary mechanism occurs when the drug's active metabolite forms a covalent bond with the ALDH enzyme, permanently deactivating it. The inhibition causes a rapid and massive buildup of the metabolite acetaldehyde in the systemic circulation immediately following ethanol exposure, fundamentally altering the body's metabolic pathway.

The accumulated acetaldehyde acts as a systemic toxin and a direct vasodilator, triggering a defined cascade of physiological effects. These changes include widespread peripheral vasodilation (flushing) and a significant compensatory tachycardia (rapid heart rate), resulting in acute systemic distress characterized by the Disulfiram-Ethanol Reaction (DER).

Because the enzyme inhibition is permanent, new enzyme protein must be synthesized by the body to recover ALDH activity. This ensures the mechanistic effect persists for an extended duration—often several days—even after the drug has been cleared from the bloodstream.

Dosage and Administration Information

Antalcol (Disulfiram) is a medicine administered solely by the oral route as a required adjunct to supportive and psychotherapeutic treatment. General usage protocols involve a period of complete alcohol abstinence for a minimum of 12 hours prior to the first dose to establish the foundation for administration.

Dosing Regimens and Frequency

The administration of Antalcol follows a defined daily schedule and is typically taken once daily. Dosing recommendations may vary; the therapy is often initiated with a maximum daily dose of 500 mg for the first one to two weeks, followed by a maintenance phase that averages 250 mg daily. The maintenance range is 125 mg to 500 mg. An initial regimen may involve a higher starting dose (e.g., 800 mg) that is gradually tapered over several days to the established maintenance level.

Administration Details and Duration

The timing of the daily dose is generally in the morning but can be adjusted to at bedtime if the patient experiences a sedative effect. Tablets may be swallowed whole or can be crushed and mixed with liquids such as water, coffee, or juice to ensure reliable intake. Disulfiram administration is typically long-term, requiring daily, uninterrupted use that may continue for many months or years. For older adults, careful dosage selection is typically observed, often initiating treatment at the lower end of the dosing range.

Recent Clinical Evidence

Research evidence / Overview of studies for Antalcol

Evidence for Maintenance of Abstinence in Alcohol Dependence

Research on Antalcol (Disulfiram) has primarily been conducted using Randomized Controlled Trials (RCTs) and subsequent Systematic Reviews that consolidate the findings from these trials. These study designs were applied in research exploring how adult patients diagnosed with chronic alcohol dependence or Alcohol Use Disorder (AUD) were evaluated for the outcome of maintaining complete abstinence from alcohol.

The studies monitored outcomes related to continuous abstinence and the time elapsed before participants consumed alcohol again (time to first relapse). Findings describe patterns observed in the studies, where differences were measured depending on how the medication was administered. Some trials described patterns where measured outcomes were more prevalent in settings where the medication intake was supervised by a third party compared to when intake was unsupervised. Studies monitored the relationship between adherence and measured outcomes.


Primary Outcomes Measured in Clinical Research

This part outlines the main endpoints used by researchers in Antalcol trials, focusing on outcomes reflecting daily functioning or activity level, as measured in studies. The key outcomes the studies monitored were related to preventing recurring alcohol consumption. These included the percentage of participants studied who maintained continuous abstinence throughout the observation period and the length of time participants were observed without a drinking episode. In some controlled, double-blind placebo trials, findings indicated that measured differences were less definitive compared to open-label studies.


Long-Term Studies and Follow-Up Duration

Research exploring Antalcol typically spanned short-term to intermediate observation periods, with most primary efficacy assessments lasting up to 6 to 12 months. Research provides insight into short-term changes. However, long-term effects are not fully established. There is limited information for long-term outcomes on maintained abstinence for treatment periods extending significantly past one year.


What Is Still Uncertain About Antalcol Research

Evidence is limited concerning unsupervised use, as results apply only to the populations studied under the specific trial conditions. Follow-up durations were limited, meaning long-term outcomes related to maintained abstinence are not fully established. Additionally, the existing studies provide limited insight into any measured differences compared to other similar medications, as comparative evidence is lacking or uncertain across the total body of literature.

Key Studies & References

  1. Current Findings and Mechanisms of Action of Disulfiram in the Treatment of Alcohol Dependence (Systematic Review)
  2. Treatment of Alcohol Use Disorder (Clinical Guidelines and Overview) - NCBI Bookshelf (NIH)

Frequently Asked Questions (FAQ)

Common questions about Antalcol (FAQ)


Q: What should I know before starting Antalcol?

A: Official prescribing information indicates that complete abstinence from all alcohol is required for a minimum of 12 hours before treatment begins. The medication is also contraindicated, or prohibited, in individuals with severe myocardial disease (heart disease) or manifest psychosis. These constraints are described to manage potential safety risks related to the drug's intended action.

Q: How quickly should I expect Antalcol to start working?

A: The mechanism of action described in official documents involves the irreversible inhibition of an enzyme, meaning the chemical deterrent effect remains active for an extended duration. This effect typically persists for several days after the drug is last used.

Q: Can using Antalcol cause problems with sleep?

A: Official product information notes that Antalcol may cause a sedative effect, or drowsiness. If patients experience this effect, regulatory documents note that the daily use may be considered at bedtime instead of in the morning.

Q: Are there any studies examining Antalcol use during pregnancy or breastfeeding?

A: The safe use of this drug in human pregnancy has not been established according to official regulatory documents. Use during pregnancy is generally advised only after careful consideration of potential benefits versus risks, as outlined in regulatory warnings. It is also officially unknown whether the drug is excreted into human milk during breastfeeding.

Q: Does using Antalcol require any changes to my normal daily activities?

A: Yes, regulatory information outlines two key required changes. Complete abstinence from all forms of alcohol is required, which is the basis for its therapeutic use. Additionally, official documents caution against driving a car or operating dangerous machinery until any risk of drowsiness is known.

Q: Does Antalcol have an effect on mental clarity or focus?

A: Official documents list potential effects across the nervous and psychiatric systems, including drowsiness, mental confusion, and the risk of psychotic reactions. These are noted as possible adverse reactions that could impact a patient's clarity or focus.

Q: Do I need a prescription to get Antalcol?

A: According to regulatory documents issued by governmental authorities, Antalcol (Disulfiram) is classified as a prescription-only medicine (Rx only). This means it requires a valid prescription from a licensed healthcare provider for dispensing.

Q: If I miss a planned use, what is the generally accepted advice?

A: Official labeling provides information on managing a missed daily use. If a use is missed, the label describes taking it as soon as the patient remembers. If it is almost time for the next scheduled use, the documentation advises skipping the missed use entirely and not taking two uses at the same time.

Q: Can Antalcol cause stomach discomfort or nausea?

A: Yes, the official prescribing information includes several gastrointestinal effects among the possible adverse reactions. These commonly listed effects include nausea, vomiting, and general stomach upset.

Q: Is there a risk of becoming dependent on Antalcol?

A: Disulfiram is not classified as a controlled substance by regulatory bodies, and official labeling does not carry specific warnings regarding dependence or abuse potential. Furthermore, documentation indicates that patients will not develop a tolerance to the drug's effects.

Q: Are there any official warnings about driving or operating machinery while using Antalcol?

A: Yes, official regulatory warnings state that the medicine may cause drowsiness. Because of this, official documents caution against driving a car or operating machinery until any potential risk is known.

Q: What does it mean that Antalcol is a 'Schedule X' drug?

A: In the United States, Disulfiram is classified as a non-controlled substance by the Drug Enforcement Administration (DEA). This classification reflects that the medication does not have recognized potential for abuse or physical dependence.

Q: Is it true that Antalcol can interact with herbal supplements?

A: Official information advises that patients inform their healthcare provider about all prescription and non-prescription medicines, including herbal products and dietary supplements. This is advised because certain substances, including some herbal supplements, have been noted as potentially hepatotoxic (liver-damaging) and should be used with caution.

Q: What steps are usually recommended if I experience a listed side effect?

A: Regulatory documents state that contacting a healthcare provider immediately is necessary if patients experience any serious symptoms. These symptoms include, but are not limited to, excessive tiredness, weakness, severe stomach pain, vomiting, or yellowing of the skin or eyes.

Q: Is it possible to develop a tolerance to the effects of Antalcol over time?

A: Official regulatory information explicitly states that patients who use Antalcol (Disulfiram) will not develop a tolerance to its pharmacological effects over time.

Q: Are there different brand names for the medicine known as Antalcol?

A: The active ingredient in Antalcol is Disulfiram. While the drug has been marketed under various brand names, the most widely known former brand name is Antabuse, which is often discontinued, leaving Disulfiram as the primary identifier.

Q: What should I do if I accidentally use more Antalcol than intended?

A: In the event of accidental use of more than intended, official documents instruct that contacting a doctor, emergency services (such as 911), or the Poison Control Center immediately is required for guidance.

Q: Is Antalcol known to affect appetite or weight?

A: Official documents list a loss of appetite as a symptom that requires immediate reporting to a healthcare provider. The official labeling focuses on this symptom being reported rather than stating general effects on weight.

Q: What is the physical appearance of Antalcol (e.g., pill color, shape)?

A: Disulfiram tablets, the core of Antalcol, are generally described as white in color. These tablets are often produced in round or capsule/oblong shapes, which can vary depending on the specific manufacturer and formulation.

Q: Are there any known interactions between Antalcol and vitamins?

A: Official regulatory information advises patients to inform their healthcare provider about all prescription and over-the-counter medicines, vitamins, and minerals they are currently taking. This allows the provider to evaluate the patient's full therapeutic profile.

How should Antalcol be stored and disposed of?

Official Storage and Disposal Guidelines

Condition Requirement
Temperature & Environment Store at room temperature and protect from light and moisture.
Packaging Keep the medicine in its original container, ensuring the cap is tightly closed.
Safety Keep Antalcol away from children and pets.
Handling Avoid releasing dust/vapors if handling the raw substance; use protective equipment.

Disposal of Unused Medicine

Regulatory authorities recommend the proper disposal of expired or unused Antalcol, as the substance is classified as very toxic to aquatic life and its release must be avoided.

The preferred disposal method is to use a drug take-back program. If a take-back option is unavailable, the medicine should be mixed with an undesirable substance (like coffee grounds or dirt) and placed in a sealed container before being thrown into the household trash. Do not flush Antalcol down the toilet unless specific instructions state otherwise.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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