Disulfiram is an alcohol antagonist that's used to treat alcohol use disorder in adults. It's a tablet that's taken by mouth once a day. It's preferred that you take part in behavioral therapies and support groups along with disulfiram. Abstinence (not drinking alcohol) is also important while you're taking this medication. Otherwise, you can get a severe reaction called the disulfiram-alcohol reaction. Some side effects can include drowsiness and headache. While the brand name Antabuse has been discontinued, generic disulfiram is still available.
Alcohol use disorder
Disulfiram is an alcohol antagonist. It works by stopping a protein in your liver from breaking down a by-product of alcohol after you consume something with alcohol in it. This causes your body to clear alcohol from your system slower.
As a result, the medication causes you to experience unpleasant effects, like sweating, a racing heart, flushing, nausea, and dizziness, when you drink any alcohol. These effects are meant to discourage you from drinking alcohol.
Source: DailyMed
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
More common
Drowsiness
Less common or rare
Decreased sexual ability in males
headache
metallic or garlic-like taste in mouth
skin rash
unusual tiredness
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Works well to manage alcohol use disorder
Only need to take once a day
Available as a lower-cost generic
Even small amounts of alcohol (like in cough syrup) can cause a bad reaction
Not a cure for alcohol use disorder
Doesn't lessen cravings for alcohol
Should be used with caution in people with certain conditions like diabetes, thyroid problems, seizures, brain damage, and liver or kidney problems
You should be alcohol-free for at least 12 hours before you take disulfiram to avoid having a disulfiram-alcohol reaction.
Avoid eating any food or drinking anything that contains alcohol while you're taking disulfiram and for 2 weeks after you stop the medication. Some foods that contain alcohol include certain sauces and condiments, vinegar, kombucha, and vanilla extract. Check the food label to see whether there's alcohol in it.
Also, avoid products containing alcohol, like mouthwashes, cold medications, and alcohol-based hand-sanitizers. Always check the ingredient list on the back of the package. Ask a provider or pharmacist if you're not sure if something has alcohol in it.
Your care team might give you an identification card for you to carry. This card lets people know that you're taking disulfiram. It also lists symptoms of the disulfiram-alcohol reaction to look out for, such as sweating, racing heart, dizziness, vomiting, trouble breathing, and chest pain. The card will also include your provider's contact information for emergencies.
Take disulfiram with or without food at any time of the day. But if the medication makes you tired, you can take it before you go to sleep.
Side effects, like sleepiness, fatigue, headache, and changes in taste, can happen within the first 2 weeks of starting disulfiram. These side effects should get better with time as you continue to take the medication. Talk to your provider if they don't and if they get too bothersome because you might need your dosage lowered.
Let your provider know if you get a rash or skin reaction after you start taking disulfiram. Your provider might recommend an antihistamine, like diphenhydramine (Benadryl), that can help.
Make sure your providers and pharmacists know about all the medications you take or have recently taken to avoid dangerous drug interactions with disulfiram. You shouldn't take an antibiotic called metronidazole (Flagyl) if you've taken disulfiram within the past 2 weeks. This combination can lead to psychosis, like changes in your mood and seeing or hearing things that aren't real.
There isn't a set amount of time that you'll need to be treated with disulfiram. You should work closely with your care team to determine how long you should continue treatment.
Disulfiram can cause some serious health issues. This risk may be even higher for certain groups. If this worries you, talk to your doctor or pharmacist about other options.
Risk factors: Drinking alcohol while taking disulfiram or within 12 hours before a disulfiram dose
Even in small amounts, drinking alcohol or consuming any products with alcohol (e.g., vinegars, cough syrups) while you're taking disulfiram will cause an unpleasant reaction called the disulfiram-alcohol reaction. Symptoms include flushing, head and neck throbbing, difficulty breathing, nausea, vomiting, fast heartbeat, and chest pain.
This reaction to alcohol can happen up to 14 days after you take disulfiram. It can last for 30 to 60 minutes, but can even last several hours in severe cases. It's recommended to seek medical help if you're experiencing symptoms that suggest you're having a disulfiram reaction.
Risk factors: History of liver problems | Taking other medications that cause liver problems
Though rare, some people who took disulfiram have had serious liver problems that can lead to liver failure. You might need to get blood tests to check your liver health before and during treatment to make sure your liver is working properly. Get medical attention right away if you notice stomach pain; yellowing of your skin or the whites of your eyes; stool changes (black, tarry, or bloody stools); dark or brown urine; nausea; vomiting; or confusion. You might need to stop using the medication to prevent further liver damage.
Risk factors: Rubber allergy
Severe allergic reactions to disulfiram are possible. Let your provider know if you have an allergy to rubber. A chemical that's in rubber called thiuram is similar to disulfiram. So, it's possible that you might be allergic to disulfiram if you're allergic to rubber. Seek medical attention right away if you notice hives, rash, red skin, swelling of the lips or tongue, or difficulty breathing after you take disulfiram.
The typical starting dose is up to 500 mg by mouth once a day for 1 to 2 weeks. Then, your provider will work with you to adjust your dose based on your response to the medication. The typical dose ranges from 125 mg to 500 mg once daily.
Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.
Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Have recently taken metronidazole (Flagyl) or alcohol-containing products (e.g., certain cough syrups, tonics)
Severe heart conditions
History of psychoses (mental health problems)
Allergy to thiuram derivatives in pesticides or rubber
Maintain abstinence from alcohol in alcohol use disorder
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Alvogen Inc. (2023). Disulfiram tablet [package insert]. DailyMed.
National Institute of Diabetes and Digestive and Kidney Diseases. (2021). Disulfiram. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury.
Pak, V. M., et al. (2012). What is the role of thiurams in allergy to natural rubber latex products? Journal of Occupational and Environmental Medicine.
Skinner, M. D., et al. (2014). Disulfiram efficacy in the treatment of alcohol dependence: A meta-analysis. Public Library of Science One.
Stokes, M., et al. (2024). Disulfiram. StatPearls.
Substance Abuse and Mental Health Services Administration. (2009). Chapter 3—Disulfiram. Incorporating Alcohol Pharmacotherapies Into Medical Practice.
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