We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Are the Risks of Combining Warfarin and Alcohol?

Tricia Christensen
Updated Mar 03, 2024
Our promise to you
The Health Board is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At The Health Board, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

The risk of combining warfarin and alcohol is principally that they increase the likelihood of excessive bleeding. This may lead to a secondary risk that is dependent on the first. Injuries obtained during alcohol-related accidents, such as falls or car accidents during drunken driving, could be more dangerous. The relationship between these two substances is complex, though, and minimal ingestion of alcohol is not likely to significantly impact health. Usually, greater problems arise when people consume more than two to three drinks a day, and especially if warfarin use isn’t accompanied by regular blood testing.

Warfarin helps prevent blood clot formation by inhibiting the action of vitamin K. Alcohol has a slightly different mechanism but it also can prevent blood clots from forming or help break them up when they occur. To a certain degree, the action produced by these substances is desirable. It can prevent strokes or other emboli. On the other hand, prevention of clotting can be a bad thing when injury with bleeding occurs.

As warfarin’s action on the blood is greater than alcohol’s, it ordinarily requires certain precautions. Patients on the drug will take blood tests like the International Normalized Ratio (INR) or Prothrombin Time (PT) quite often to make sure that they are taking the drug at a safe dosage. Warfarin is so reactive with other foods, drugs and infections that most people require frequent tests and experience regular changes to their dose.

Due to the regularity of blood testing, using warfarin and alcohol together in reasonable amounts simply requires slight dosage modifications, as the INR or PT will reflect a longer clotting time. If alcohol is used in excess, tests may be unstable, and it may be difficult to prescribe an appropriate warfarin amount that doesn’t place patients at risk for perilously low clotting times. Also, occasionally, patients don’t get the tests they require and may not realize that they are in danger.

What this means is that most doctors allow their patients to use warfarin and alcohol together. This recommendation frequently depends on the individual’s agreement to get regular blood tests. Consumption above two to three drinks daily isn’t advised because no amount of warfarin may be safely administered with this much alcohol.

The combination of warfarin and alcohol in excess can create an indirect effect. Intoxicated people are more prone to accidents in vehicles or to simple falls, slips, or trips. If warfarin and alcohol are used together, there may be a greater chance of excess bleeding from injuries, which might prove fatal. The combination of blood monitoring, never operating a vehicle after drinking, and keeping alcohol consumption to safe and moderate levels largely eliminates this secondary risk.

The Health Board is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Tricia Christensen
By Tricia Christensen
With a Literature degree from Sonoma State University and years of experience as a The Health Board contributor, Tricia Christensen is based in Northern California and brings a wealth of knowledge and passion to her writing. Her wide-ranging interests include reading, writing, medicine, art, film, history, politics, ethics, and religion, all of which she incorporates into her informative articles. Tricia is currently working on her first novel.
Discussion Comments
By serenesurface — On Mar 07, 2014

I'm on warfarin therapy and my doctor told me not to drink. She said that alcohol increases the effects of alcohol. So in a way, it's like taking more warfarin, except that alcohol comes with its own side effects. Alcohol is not very good for the body anyway. It depresses the central nervous system. It can affect motor control and vital functions. It can cause anxiety and depression, and it can harm the stomach.

By ZipLine — On Mar 07, 2014

@SarahGen-- I'm not sure, I'm not an expert on this topic.

I suppose the warfarin and alcohol interaction would strain certain organs like the kidneys or the liver. But I'm sure it depends on the dose. The bigger risk with high doses of warfarin and large amounts alcohol would be internal bleeding, since both have an effect of thinning the blood. The combination could also cause upset stomach or other stomach complications.

It's best to avoid alcohol while on warfarin. I know that most people would like to have a drink now and then on special occasions. If the doctor is okay with this, then obviously it's fine. But regular drinking or drinking large amounts of alcohol can be very dangerous. I personally avoid alcohol altogether because I already experience side effects from warfarin and I don't want to experience more.

By SarahGen — On Mar 06, 2014

Can the combination of alcohol and warfarin harm internal organs?

Tricia Christensen
Tricia Christensen
With a Literature degree from Sonoma State University and years of experience as a The Health Board contributor, Tricia...
Learn more
The Health Board, in your inbox

Our latest articles, guides, and more, delivered daily.

The Health Board, in your inbox

Our latest articles, guides, and more, delivered daily.