Blood thinners and alcohol: can they be used together?

You have probably experienced some unpleasant side effects if you’ve mixed drinking with prescription medication. Some combinations are more dangerous than others. Have you recently started taking blood-thinning medication following a stroke? or are you someone who has taken blood thinners for many years? Are you unsure of the risks associated with combining blood thinners and alcohol? Here we look at what you need to be aware of if you’re taking blood thinners and alcohol together.

What are blood thinners and how do they work?

When you get hurt, blood cells called platelets gather at the injury site and form a blood clot. These cells are sticky, and they form clumps creating a plug. Clotting factors are also released from platelets that help form a mesh to form the plug to close the wound.

The clotting process is essential when you’re injured. Sometimes, however, a blood clot can appear in an artery that supplies your heart or brain with oxygen-rich blood. When a clot blocks blood flow to your heart, it can cause a heart attack. If it blocks the blood flow to your brain, it can cause a stroke. The use of blood thinners in this group of patients is common. Warfarin (Coumadin) is the most widely used blood thinner.

Doctors have the option of prescribing three types of blood-thinning medications which work at different stages of the blood clot formation process:


These drugs prevent blood platelets from sticking and forming clots.


These drugs work by blocking the clotting process in the blood.


  • Activase (Alteplase)
  • Streptokinase (Streptase)
  • Urokinase

These drugs work by breaking fibrin formation causing the clot to dissolve.

Blood-thinning medications are used in patients who are at risk of developing blood clots that could block a blood vessel and disturb the flow of blood around the body. You will most likely be prescribed this medication if you have conditions such as:

  • Atrial fibrillation, also known as an irregular heartbeat
  • Recent knee or hip replacement and are at risk of deep vein thrombosis (DVT) and pulmonary embolism
  • Heart disease

Generally, these medical conditions can cause blood clots and anticoagulant medications increase your risk of bleeding. Patients taking blood thinners to treat heart disease often also take medications, such as PraluentRepathaWelcholColestid, and Livalo which help to reduce cholesterol levels. As a side effect statins can reduce the level of platelets in your blood, suggesting these drugs might also act as mild anticoagulants.

What else thins your blood and increases your risk of bleeding? Drinking alcohol. Combine alcohol use and anticoagulants and there is an increased risk of bleeding.

Why is it a risk?

One of the functions of your liver is to break down alcohol and some medications. If your liver is busy working hard removing the alcohol instead of your blood thinner, the level of the drug in your blood will go up and raise your bleeding risk.

When the body’s ability to clot is reduced internal vessels may begin bleeding inside the body. When enough liver damage has been endured there is a risk of bleeding and shock.

The amount of alcohol consumption has differing effects on the body depending on how much is consumed with blood-thinning medications:

  • Occasional drinking with blood thinners and alcohol does not put you at significant risk and does not appear to interfere with the job of anticoagulants
  • An excessive amount of alcohol (binge drinking) in combination may result in extreme blood thinning due to their synergistic effect
  • Regular drinking can result in the blood becoming too thin. The drug loses its effectiveness e.g. gums, minor cuts, and scratches may bleed much more than they usually would
  • Drinking alcohol in moderate amounts has been shown to thin the blood, but medical professionals do not recommend drinking as a substitution for a prescription blood thinner

Is this a short-term effect?

Alcohol intake is the main factor determining how long the effects last. In people who drink moderately, the effect of alcohol on platelets is short-lived.

According to The U.S. Dietary Guidelines for American adults, moderate drinking is classed as follows:

  • For women – up to one drink per day
  • For men – up to two drinks per day

Examples of one drink include:

  • 12-ounce beer at 5% alcohol
  • A 5-ounce glass of wine at 12% alcohol
  • 1.5 ounces of hard liquor at 40% alcohol

If you drink heavily, there can be a rebound effect in that the bleeding risk increases, even after you’ve stopped drinking. Exceeding the recommended guidelines above is considered heavy drinking.

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Side effects of mixing alcohol and blood thinners

These are the side effects associated with combining alcohol and anticoagulants:

  • Nosebleeds
  • Bleeding of gums
  • Continued bleeding from cuts or injury
  • Heavier menstrual flow
  • Easy bruising
  • Blood in urine, vomit, or stool
  • Lower blood pressure
  • Dizziness, fainting
  • Nausea and vomiting
  • Breathlessness
  • Chest pain
  • Confusion

Can alcohol thin your blood?

Yes, alcohol can thin your blood. It interferes with the clotting process in two ways:

  1. It disrupts blood cell production in the bone marrow reducing the number of platelets in the blood.
  2. It makes the platelets you do have less sticky.

Females retain more alcohol in the bloodstream than males, so they are at higher risk of developing problems from combining alcohol with medications.

Combining alcohol and medications also carries an increased risk for older adults. The speed at which the body breaks down alcohol slows with age, meaning that alcohol remains in the bloodstream for longer.

Although alcohol reduces blood clotting, it should never be used as a replacement for anticoagulants.

Treatment for alcohol use disorder

Alcohol can have an impact on every system in the body causing health problems throughout the body: cardiovascular disease, liver disease, immune system problems, cancer, ulcers, and disturbance of the gastrointestinal system. Many of these problems can lead to life-threatening outcomes.

The treatment of alcohol dependency involves a variety of different methods. The National Institute on Alcohol Abuse and Alcoholism (NIAAA) and the National Institute of Health (NIH) are both trusted sources you can access to get help for yourself or a loved one. A combination of medical advice from a health care provider, social, and family support is also essential.

Medically reviewed

A medical professional has reviewed this article.

Jamie Winn, PharmD
Jamie Winn, PharmD

Jamie Winn, PharmD

Medical Writer & Reviewer

Jamie Winn, PharmD

Medical Writer & Reviewer

Dr. Jamie Winn received his Doctor of Pharmacy in 2002 from the University of South Carolina College of Pharmacy, Columbia, SC. Jamie is a medical reviewer for NiceRx.

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Sources (1)

  1. Dr. Harb Nidal Harb. (2020, June) Common Questions About Alcohol and Blood Thinners. Retrieved from

The content on this website is intended for information purposes only. It does not constitute medical advice. The information on this website should not be relied upon and is not a substitute for professional medical advice. You should always speak to your doctor regarding the risks and benefits of any treatment.