Aspirin interacts with a surprisingly long list of medications, supplements, foods, and health conditions. Whether you take a daily low-dose aspirin for heart protection or reach for it occasionally for pain, knowing what to avoid can prevent serious complications, especially gastrointestinal bleeding, which is the most common danger.
Ibuprofen and Other NSAIDs
If you take daily low-dose aspirin for your heart, ibuprofen (Advil, Motrin) can block aspirin’s ability to prevent blood clots. Both drugs compete for the same binding site on platelets, and ibuprofen can get there first, essentially canceling out aspirin’s protective effect.
Timing matters. The FDA advises taking ibuprofen at least 30 minutes after your aspirin dose, or at least 8 hours before it. This applies to immediate-release (non-enteric-coated) aspirin. If you take ibuprofen regularly rather than as a single dose, the interference is harder to work around, so talk to your prescriber about alternatives like acetaminophen (Tylenol) for pain relief, which doesn’t interact with aspirin’s antiplatelet effect.
Naproxen (Aleve) poses a similar concern. Any over-the-counter pain reliever in the NSAID family can both interfere with aspirin’s heart benefits and compound its stomach risks.
Alcohol
Both aspirin and alcohol irritate the stomach lining, and combining them raises the risk of gastrointestinal bleeding significantly. People who consume 35 or more alcoholic drinks per week while on aspirin face a 6.3 times higher risk of major gastrointestinal bleeding compared to those who don’t drink.
The general guidance: women of all ages and men over 65 should have no more than one drink per day while taking aspirin. Men under 65 should stop at two. These limits apply to regular aspirin users, not just people taking it on a given day. Gastrointestinal bleeding from this combination isn’t always obvious. It can show up as dark, tarry stools or bright-red blood in vomit, but sometimes causes slow blood loss that leads to anemia before you notice any visible signs.
Antidepressants (SSRIs)
Selective serotonin reuptake inhibitors, the most commonly prescribed class of antidepressants, reduce serotonin levels in platelets. Platelets need serotonin to form clots properly, so SSRIs on their own modestly raise bleeding risk. Combined with aspirin or other NSAIDs, the risk of upper gastrointestinal bleeding jumps to roughly six times higher than in people taking neither medication. At that level of risk, about 1 in 82 people taking both would be expected to develop a significant bleed.
If you’re on an SSRI and need regular aspirin, your doctor may recommend a stomach-protecting medication to reduce this risk.
Blood Thinners
Aspirin is itself a blood thinner, and stacking it with prescription anticoagulants creates a compounding bleeding risk. Research published in the Journal of the American Heart Association found that patients on both an anticoagulant and aspirin experienced major or clinically relevant bleeding at a rate of about 15%, while adding a second antiplatelet drug on top pushed that rate to nearly 27%. Some people genuinely need both medications, particularly after certain heart procedures, but the combination should never be started or stopped on your own.
Supplements That Thin the Blood
Several common supplements also have blood-thinning properties that can compound aspirin’s effects. The FDA specifically warns that ginkgo biloba, vitamin E, and fish oil can each thin the blood independently, and taking any of them alongside aspirin increases the potential for internal bleeding or stroke. If you take daily aspirin and use any of these supplements, your provider needs to know so they can assess your overall bleeding risk.
Aspirin and Children
Aspirin should not be given to children or teenagers. The reason is Reye’s syndrome, a rare but potentially fatal condition that causes swelling in the liver and brain. It develops when aspirin is given during or shortly after a viral infection, particularly the flu or chickenpox, though upper respiratory infections like the common cold have also been linked to cases. There is no safe pediatric dose for routine use. Acetaminophen or ibuprofen are the standard alternatives for fever and pain in kids.
Asthma and Nasal Polyps
Some people have a condition called aspirin-exacerbated respiratory disease, sometimes referred to as Samter’s triad. It involves three overlapping problems: asthma, nasal polyps, and respiratory reactions triggered by aspirin or other NSAIDs. Only a small percentage of people with asthma develop this sensitivity, but for those who have it, even a standard dose of aspirin can trigger wheezing, nasal congestion, and breathing difficulty. If you have asthma and nasal polyps, aspirin should be approached with caution and only under medical guidance.
Before Surgery
Because aspirin prevents platelets from clumping for their entire 7-to-10-day lifespan, its blood-thinning effect lingers well after you stop taking it. For elective surgery, patients without coronary heart disease are typically told to stop aspirin beforehand because the bleeding risk during the procedure outweighs the benefit.
The exception is important: if you have a coronary stent, guidelines from the American College of Cardiology recommend continuing low-dose aspirin without interruption, even through surgery. Stopping it in stent patients can trigger a clot inside the stent, which is potentially life-threatening. For procedures where bleeding risk is especially high, such as brain surgery, the decision involves a careful conversation between the surgeon, cardiologist, and patient.
Aspirin for Prevention After Age 60
If you don’t already have heart disease and you’re 60 or older, starting a daily aspirin regimen is no longer recommended. The U.S. Preventive Services Task Force concluded with moderate certainty that initiating aspirin for primary prevention in adults 60 and older provides no net benefit, because the bleeding risks at that age offset the cardiovascular protection. This applies to starting aspirin. If you’re already on it for a specific reason, stopping is a decision to make with your doctor, not on your own.
Enteric Coating Doesn’t Eliminate Stomach Risk
Many people choose enteric-coated aspirin believing it protects the stomach. The coating does prevent the tablet from dissolving until it reaches the small intestine, bypassing direct contact with the stomach lining. But aspirin’s effect on the stomach is largely systemic, not just local. It reduces protective compounds throughout the digestive tract regardless of where the pill dissolves. Data from the ADAPTABLE trial, one of the largest aspirin studies conducted, found no significant difference in gastrointestinal bleeding rates between enteric-coated and plain aspirin. The coating also appears to reduce platelet inhibition in some people, potentially making the aspirin less effective at its primary job.
If you’re concerned about stomach protection, a more effective approach is taking aspirin with food or using a stomach-acid-reducing medication rather than relying on the coating itself.