Is ibuprofen a blood thinner?

In this article:

• Is ibuprofen a blood thinner?
• Ibuprofen vs. blood thinners
• Risks of ibuprofen
• Long-term impact
• Who needs to be careful with ibuprofen?
• Other medications to watch out for
• When to choose ibuprofen
• FAQs
• The bottom line

In this article

• Is ibuprofen a blood thinner?
• Ibuprofen vs. blood thinners
• Risks of ibuprofen
• Long-term impact
• Who needs to be careful with ibuprofen?
• Other medications to watch out for
• When to choose ibuprofen
• FAQs
• The bottom line

Ibuprofen, often sold under the brand names Motrin and Advil, is a nonsteroidal anti-inflammatory drug (NSAID). Ibuprofen can be used to relieve pain, reduce inflammation (swelling), and lower a fever. Ibuprofen is available over-the-counter (OTC) and by prescription in higher doses. Ibuprofen can also be found as an ingredient in many OTC combination products, such as Advil PM. NSAIDs like ibuprofen are associated with an increased risk of bleeding. However, they are not blood thinners. Continue reading to learn more about this topic.

Does ibuprofen thin your blood?

Ibuprofen is classified as a nonsteroidal anti-inflammatory drug, or NSAID for short. Besides ibuprofen, some examples of other NSAIDs include Aleve (naproxen), Mobic (meloxicam), Celebrex (celecoxib), and Voltaren (diclofenac). Let’s talk about how NSAIDs like ibuprofen work.

• Enzymes are proteins that speed up chemical reactions.
• Cyclooxygenase is an enzyme needed to make certain substances in the body, such as prostaglandins and thromboxanes. Prostaglandins can cause pain, inflammation (swelling), and fever. Platelets produced by thromboxanes are involved in blood clotting, which helps heal wounds and prevent excessive bleeding.
• NSAIDs work by interfering with the enzyme cyclooxygenase. By doing so, fewer prostaglandins and thromboxanes are produced. 
• Because fewer prostaglandins are produced, NSAIDs help relieve symptoms such as pain, inflammation, and fever. Collaterally, protective prostaglandin synthesis is also inhibited, which, in combination with direct mucosal injury to the gastrointestinal tract, can cause bleeding. 
• Additionally, because NSAIDs affect thromboxanes and ultimately platelet dysfunction, which affects blood clotting, there is also a risk of bleeding. Ibuprofen does not directly thin the blood, however.

Ibuprofen vs. blood thinners

Now that we know how ibuprofen works, let’s discuss blood thinners. Blood thinners are medicines that prevent blood clots from forming. They do not break up pre-existing blood clots. Blood clots can lead to serious or fatal problems like heart attacks and strokes. Examples of individuals who may need to take a blood thinner include:

• People with certain blood vessel or heart conditions
• People with atrial fibrillation (a type of abnormal heart rhythm)
• People who have had a heart valve replacement
• People who are at risk for blood clots after a surgical procedure
• People with certain congenital (inherited) heart defects

There are two types of blood thinners:

Anticoagulants work by slowing blood clot production and preventing clot extension. Examples of anticoagulants include Coumadin (warfarin), Eliquis (apixaban), and Xarelto (rivaroxaban).

Antiplatelets prevent platelets (blood cells that help stop bleeding and form clots) from aggregating. Examples of antiplatelets include Plavix (clopidogrel), Effient (prasugrel), and Brilinta (ticagrelor). Aspirin is also an antiplatelet drug. 

Note that aspirin is an NSAID as well as an antiplatelet drug. Because it is an antiplatelet drug, some people will be advised to take daily low-dose aspirin to either prevent or treat cardiovascular events like heart attacks and strokes. However, this is not recommended for everyone—you should not take daily aspirin without consulting a healthcare provider. Aspirin can be used as an NSAID in adults for pain, inflammation, and fever at higher doses. 

Although NSAIDs like ibuprofen may increase the risk of bleeding, they are not used as blood thinners. A healthcare professional will never recommend or prescribe ibuprofen to thin the blood. However, if you take an NSAID, you can have an increased risk of bleeding as a side effect.

Risks of ibuprofen 

Common side effects of ibuprofen may include:

• Constipation 
• Gas
• Bloating
• Dizziness
• Nervousness
• Tinnitus (ringing in the ears)

As a prescription, ibuprofen has a black box warning, the most serious warning required by the U.S. Food & Drug Administration (FDA). Some of the warnings include:

• NSAIDs like ibuprofen can increase the risk of heart attack and stroke, which can cause death.
• NSAIDs like ibuprofen can increase the risk of serious gastrointestinal events, including stomach bleeding, perforation (holes), and stomach ulcers (sores). 

In addition to the black box warning, other serious side effects may include, but are not limited to:

• Allergic reactions (such as hives, shortness of breath, or swelling) require emergency medical attention
• Skin reactions (symptoms such as fever, sore throat, burning eyes, skin pain, red or purple rash, or blistering or peeling skin require emergency medical attention)
• Liver problems
• Kidney problems
• Heart failure
• High blood pressure
• Anemia (low red blood cells)
• Vision problems

Ibuprofen is not safe for everyone. Before taking ibuprofen, you should tell your healthcare provider about all of your medical conditions. You should not take ibuprofen if you are allergic to ibuprofen or any NSAID, including aspirin. Other contraindications (situations where you should not take this medication) include:

• Before or after coronary artery bypass graft (CABG) surgery
• Third trimester of pregnancy (always consult a healthcare provider if you are pregnant, planning to become pregnant, or breastfeeding)
• Severe kidney problems
• Recent heart attack

NSAIDs like Advil and Motrin are generally recommended to be taken at the lowest effective dose for the shortest period of time. The risk of bleeding from NSAIDs is higher if:

• You take certain medications, such as steroids, blood thinners, or SSRI or SNRI antidepressants
• You take an NSAID for a longer time or a higher dose
• You smoke
• You drink alcohol
• You are older
• You have other health conditions, such as liver problems
• You have bleeding problems

Long-term impact

• NSAIDs, like Advil and Motrin, inhibit platelet function by blocking cyclooxygenase (COX) enzymes. Platelets primarily express COX-1, and when NSAIDs block COX-1, thromboxane A2 production decreases, thereby impairing platelet aggregation. Different NSAIDs produce varying degrees and durations of platelet inhibition, and fortunately, NSAID-induced platelet dysfunction is reversible. Ibuprofen, the active ingredient in Advil and Motrin, shows mild antiplatelet effects that are undetectable after 24-48 hours of being drug-free in most individuals. NSAIDs with longer durations of action, like naproxen, can induce greater suppression of thromboxane A2 biosynthesis throughout their dosing interval, but even with this NSAID, the effect normalizes after 48-72 hours of being NSAID-free. 
• Long-term NSAID use can cause direct mucosal injury throughout the entire gastrointestinal tract, with up to 25% of chronic users developing peptic ulcer disease and 2-4% experiencing more serious complications like bleeding or perforation. Several risk factors amplify this long-term complication.

Who needs to be careful with ibuprofen and bleeding risks?

Advanced age (> 65 years)

Older adults are at an increased risk of bleeding with ibuprofen use due to age-related physiological changes, comorbidities that independently are risk factors for NSAID-related bleeding, and potential for drug-drug interactions.

History of complicated peptic ulcer 

The risk of bleeding due to ibuprofen use in patients with a history of peptic ulcers depends on the severity of the ulcer. Patients with a history of a complicated ulcer, resulting in bleeding or perforation, are considered at very high risk and advised to avoid NSAIDs entirely, if possible. Even patients with a history of uncomplicated peptic ulcer disease are also placed in a high-risk category. For these patients, if anti-inflammatory therapy is required, it is recommended to preferentially use a COX-2 inhibitor in conjunction with a proton-pump inhibitor (PPI).

Individuals on blood thinners

Blood thinners cause impairment of the coagulation cascade, so when combined with NSAIDs, which carry antiplatelet effects and reduced gastric mucosal protection, additive risks for bleeding ensue. 

Individuals taking oral corticosteroids

Corticosteroids and NSAIDs like ibuprofen can exhibit a synergistic effect on gastrointestinal mucosal damage, increasing bleeding risk when combined.

Higher doses of NSAIDs 

Higher doses of NSAIDs increase bleeding risk by more sustained inhibition of gastric mucosal protection, complete and prolonged platelet inhibition. High-dose NSAIDs are a risk factor for serious upper gastrointestinal adverse events, with the risk being highest during the first week of therapy but the potential to persist throughout receipt of NSAIDs. 

Patients undergoing surgery

The inhibition of platelet aggregation through COX-1 blockage with the use of NSAIDs can occur at any site of the body, not just the gastrointestinal tract. Therefore, patients undergoing surgery can face an increased risk of bleeding at the surgical site, in addition to other potential risks of increased bleeding. 

Other medications to watch out for

The risk of bleeding isn’t just about combining ibuprofen with prescription blood thinners. Several other medications can also increase this risk when taken concurrently:

• Other NSAIDs
• Corticosteroids such as prednisone 
• Blood thinners such as warfarin or heparin
• SSRI antidepressants such as Lexapro (escitalopram)
• SNRI antidepressants such as Effexor (venlafaxine)
• Certain over-the-counter supplements, like garlic, ginkgo biloba, and vitamin E

According to the prescribing information, studies have shown that ibuprofen can specifically interact with aspirin. Taking ibuprofen with aspirin can increase the risk of bleeding, which can be life-threatening. However, ibuprofen may also interfere with aspirin’s protective effects on the heart. So, if you take low-dose aspirin as a blood thinner, check with your healthcare professional before taking pain relievers. You may need to take a medication that is not an NSAID, such as Tylenol (acetaminophen).

When to choose ibuprofen and when to steer clear

The fundamental approach to ibuprofen use is to use the lowest dose for the shortest duration necessary to achieve relief. If you fall into a high-risk population, like a history of peptic ulcer disease, are older adult, and/or taking other medications which can result in synergistic bleeding risk, use great caution and seek alternative therapies. Seek medical advice from a healthcare professional for the optimal dose, duration, and monitoring for warning signs of adverse effects, as well as alternative treatments that may be more appropriate. 

Frequently asked questions

Does Advil thin your blood?

Ibuprofen does not directly thin the blood. It can affect platelet function, potentially increasing the risk of bleeding.

Can Motrin cause internal bleeding?

Yes, ibuprofen can increase the risk of stomach or intestinal bleeding, especially when taken at high doses or for long periods.

Is ibuprofen safer than aspirin for bleeding risk?

Ibuprofen may have a lower bleeding risk than aspirin for some people, but both medications can cause bleeding and should be used carefully.

Can you take ibuprofen if you are on blood thinners?

You should talk to your healthcare provider before taking ibuprofen with blood thinners, as the combination can significantly increase bleeding risk.

How long does ibuprofen increase bleeding risk?

Ibuprofen’s effects on bleeding usually last while the medication is in your system, typically up to 24 hours after your last dose.

Is acetaminophen safer than ibuprofen for people at risk of bleeding?

Acetaminophen does not affect platelets and is often considered a safer option for pain relief if you are at risk of bleeding.

Who should avoid taking ibuprofen?

People with a history of stomach ulcers, bleeding disorders, kidney disease, or recent heart surgery should avoid ibuprofen unless advised by a healthcare provider.

Can ibuprofen interfere with aspirin’s heart-protective effects?

Yes, ibuprofen can reduce aspirin’s heart-protective effects if taken at the wrong time. A healthcare provider can help you safely space doses.

What should I do if I need pain relief while on a blood thinner?

Ask your healthcare provider or pharmacist about safer alternatives, such as acetaminophen or non-drug pain management options.

The bottom line 

Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, inflammation, and fever. Although ibuprofen can increase the risk of bleeding, especially when combined with certain medications, it is not a blood thinner and should never be used as such. If you take a blood thinner, check with your healthcare provider about the best options for pain relief. 

If you have any questions about ibuprofen, consult your healthcare provider or pharmacist for more information.