Eliquis (apixaban) is a blood thinner, so its most common side effects revolve around bleeding. In clinical trials, the most frequently reported problems were bruising, nosebleeds, bleeding gums, and heavier-than-normal bleeding from cuts or injuries. Most people tolerate Eliquis well compared to older blood thinners, but there are important warning signs to recognize and serious risks worth understanding.
Common Side Effects
Because Eliquis works by reducing your blood’s ability to clot, everyday bumps and scrapes may bleed more than you’re used to. The side effects most people notice include bruising easily, minor nosebleeds, bleeding gums when brushing teeth, and small cuts that take longer to stop bleeding. Some people also experience nausea or feel lightheaded, particularly in the first weeks of treatment.
These effects are generally mild and don’t require medical attention unless they become persistent or worsen over time. Heavier menstrual bleeding is also common in women taking Eliquis.
Serious Bleeding Risks
The most significant concern with any blood thinner is major bleeding, meaning bleeding that is difficult to control, happens internally, or requires medical intervention. With Eliquis, the rate of major bleeding in clinical trials was roughly 3.4 events per 100 patient-years. That’s meaningfully lower than warfarin, the older blood thinner it often replaces, which produced about 4.7 major bleeds per 100 patient-years in head-to-head comparisons.
The ARISTOTLE trial found that Eliquis reduced the risk of major bleeding by about 29% compared to warfarin across most body weight categories. Intracranial bleeding (bleeding inside the skull) was also significantly lower with Eliquis than with warfarin. This safety advantage is a major reason doctors now prescribe it so widely for atrial fibrillation and blood clot prevention.
Still, major bleeding can happen. Gastrointestinal bleeding and bleeding in the brain, while uncommon, are the most dangerous possibilities.
Warning Signs That Need Immediate Attention
Internal bleeding doesn’t always look like what you’d expect. Knowing the warning signs can make a critical difference. Get emergency help if you experience any of the following:
- Red, pink, or brown urine, which can signal bleeding in the urinary tract
- Red or black, tarry stools, a sign of bleeding in the digestive tract
- Vomiting blood or material that looks like coffee grounds, indicating stomach bleeding
- Unusual headaches, dizziness, or feeling faint, which may point to bleeding in the brain
- Unexplained swelling or joint pain, which can result from internal bleeding into tissues
- Bleeding that won’t stop from any source, including gums or nosebleeds
Any bruising that seems severe or appears without an obvious cause also warrants a call to your doctor.
FDA Black Box Warnings
Eliquis carries two boxed warnings from the FDA, the most serious type of safety alert.
The first involves stopping the medication too early. Discontinuing Eliquis prematurely increases the risk of blood clots, stroke, and other thrombotic events. If you need to stop taking it for any reason other than a bleeding emergency, your doctor will typically bridge you with another anticoagulant to maintain protection.
The second warning concerns spinal procedures. Patients who receive spinal or epidural anesthesia, or who undergo spinal puncture while on Eliquis, face a risk of developing blood clots near the spine (epidural or spinal hematomas). These hematomas can cause long-term or permanent paralysis. The risk goes up if you’re also taking other medications that affect clotting, or if you have a history of difficult or repeated spinal punctures. If you’re scheduled for any spinal procedure, your medical team needs to know you’re on Eliquis well in advance.
Medications That Increase Bleeding Risk
Several common medications amplify the bleeding effects of Eliquis when taken together. The most important ones to be aware of:
NSAIDs like ibuprofen (Advil) and naproxen (Aleve) are among the most significant because so many people take them casually for pain. Combining them with Eliquis increases bleeding risk, particularly in the stomach and intestines. If you need pain relief while on Eliquis, talk to your doctor about safer alternatives. When an NSAID is truly necessary, the guidance is to use the lowest dose for the shortest time possible, often with stomach-protective medication.
Antidepressants in the SSRI and SNRI classes (common medications for depression and anxiety) also raise bleeding risk when combined with Eliquis. This doesn’t mean you can’t take both, but your doctor may recommend monitoring for signs of anemia or unusual bleeding, especially if you have other risk factors.
Antiplatelet drugs like aspirin and clopidogrel thin the blood through a different mechanism, so combining them with Eliquis essentially doubles down on reduced clotting ability. This combination is generally avoided unless a specialist specifically recommends it, such as after a heart stent procedure.
Rare Allergic Reactions
True allergic reactions to Eliquis are rare but documented. Symptoms include hives, skin rash, itching, swelling of the face or tongue, chest tightness, and difficulty breathing. These signs of a hypersensitivity reaction require immediate medical attention. Most people who take Eliquis never experience anything like this, but it’s worth recognizing the symptoms in case they occur, particularly when first starting the medication.
If Serious Bleeding Happens
One concern patients sometimes have about blood thinners is whether the effects can be reversed in an emergency. Eliquis does have a specific reversal agent called andexanet alfa, approved for use when life-threatening or uncontrolled bleeding occurs. It works by binding to the drug and neutralizing its blood-thinning effect. This is administered in a hospital setting during emergencies, and its existence provides an important safety net that wasn’t available in the early years of newer blood thinners.
Who Faces Higher Risk
Older adults and people with reduced kidney function are more susceptible to side effects from Eliquis. The kidneys help clear the drug from the body, so when they’re not working at full capacity, the medication can accumulate and intensify its blood-thinning effect. For patients who meet certain criteria (typically a combination of advanced age, low body weight, and impaired kidney function), doctors prescribe a lower dose to balance clot prevention against bleeding risk.
People with liver problems also need careful evaluation, since the liver plays a role in processing the drug. If you have any history of kidney or liver disease, your prescriber has likely already factored this into your dosing, but it’s worth confirming if you’re unsure.