The most widely used blood thinners fall into two categories: anticoagulants, which slow down your body’s clotting process, and antiplatelets, which prevent blood cells from clumping together. Together, the top 10 include warfarin, apixaban (Eliquis), rivaroxaban (Xarelto), dabigatran (Pradaxa), edoxaban (Savaysa), heparin, aspirin, clopidogrel (Plavix), prasugrel (Effient), and ticagrelor (Brilinta). Each works differently, treats different conditions, and comes with its own set of tradeoffs.
Anticoagulants vs. Antiplatelets
These two classes of drugs both reduce clotting, but they target different parts of the process. Anticoagulants interfere with the chain of chemical reactions that forms a clot. Antiplatelets stop platelets, the tiny cell fragments in your blood, from sticking together in the first place.
Your doctor chooses between them based on your condition. Anticoagulants are the standard treatment for atrial fibrillation, deep vein thrombosis (DVT), and pulmonary embolism (PE). Antiplatelets are more commonly prescribed after heart attacks, stent placement, or bypass surgery. Some people take one from each category at the same time.
The 6 Most Common Anticoagulants
Warfarin (Coumadin)
Warfarin has been around for decades and remains one of the most recognized blood thinners. It works by blocking your body’s use of vitamin K, a nutrient essential to making several clotting proteins. The more warfarin you take, the more it suppresses those proteins, which is why the dose has to be carefully calibrated.
The biggest practical difference between warfarin and newer options is monitoring. You need regular blood tests, typically monthly at a clinic or weekly if you test at home, to measure your INR (a number reflecting how quickly your blood clots). If your INR drifts too high, bleeding risk goes up. If it drops too low, clot risk returns. Diet also matters: foods rich in vitamin K, like broccoli, Brussels sprouts, Swiss chard, and turnip greens, can reduce warfarin’s effectiveness. You don’t have to avoid these foods entirely, but you need to eat a consistent amount from day to day. Grapefruit juice, cranberry juice, alcohol, and green tea can also interfere.
One advantage warfarin still holds is that it has a well-established reversal agent. In an emergency, vitamin K and clotting factor concentrates can counteract it within minutes to hours.
Apixaban (Eliquis)
Apixaban is a direct oral anticoagulant (DOAC) that blocks a single clotting protein called factor Xa. It’s approved to reduce stroke risk in people with atrial fibrillation, to treat and prevent DVT and PE, and to prevent clots after hip or knee replacement surgery. It requires no routine blood monitoring and has no vitamin K dietary restrictions, which makes daily life simpler than with warfarin.
Rivaroxaban (Xarelto)
Rivaroxaban works by the same mechanism as apixaban, blocking factor Xa. Its approved uses overlap significantly: atrial fibrillation, DVT, PE, and post-surgical clot prevention. The main practical difference is dosing. Rivaroxaban is typically taken once daily (with food for some indications), while apixaban is taken twice daily.
Dabigatran (Pradaxa)
Dabigatran takes a different approach from the other DOACs. Instead of blocking factor Xa, it directly binds to thrombin, the central enzyme that converts blood into a clot. It’s used primarily for stroke prevention in atrial fibrillation and for treating blood clots. Dabigatran has its own specific reversal agent, which can neutralize its effects within minutes during emergency bleeding.
Edoxaban (Savaysa)
Edoxaban is another factor Xa inhibitor, less commonly prescribed than apixaban or rivaroxaban but used for the same core conditions: atrial fibrillation and blood clot treatment. Like the other DOACs, it doesn’t require INR monitoring or dietary changes.
Heparin
Heparin is different from the rest of this list because it’s given by injection or IV, not taken as a pill. Hospitals use it to prevent and treat clots during surgery, hospitalization, or acute medical events. A related form, called low-molecular-weight heparin (often sold as Lovenox), comes in pre-filled syringes that patients can inject at home, sometimes for weeks after surgery or during pregnancy when oral blood thinners aren’t appropriate.
The 4 Most Common Antiplatelets
Aspirin
Aspirin is the oldest and most familiar blood thinner. At low doses (typically 81 mg), it prevents platelets from activating and clumping. Nearly everyone with coronary artery disease, including those who’ve had a heart attack, stent, or bypass surgery, takes aspirin as part of their long-term treatment. It’s available over the counter, but using it as a blood thinner is a medical decision, not a casual one, because it still carries bleeding risk.
Clopidogrel (Plavix)
Clopidogrel blocks a specific receptor on platelets that responds to a chemical signal called ADP. Without that signal, platelets can’t activate as easily. It’s commonly prescribed alongside aspirin after a heart attack or stent placement, a combination known as dual antiplatelet therapy. It’s taken once daily.
Prasugrel (Effient)
Prasugrel works through the same pathway as clopidogrel but is more potent. It’s typically reserved for patients who’ve had a stent placed and are not at high risk of bleeding. Because it’s stronger, it’s also harder to reverse, which is why it’s used more selectively.
Ticagrelor (Brilinta)
Ticagrelor also blocks the same platelet receptor, but unlike clopidogrel and prasugrel, its effect is reversible. That means if you stop taking it, your platelet function recovers faster. It’s taken twice daily and is frequently paired with aspirin after acute coronary events.
How the DOACs Compare to Each Other
If your doctor is choosing between apixaban, rivaroxaban, and dabigatran for atrial fibrillation, the good news is that large studies have found no statistically significant difference in their ability to prevent stroke. A nationwide study from Norway comparing all three found stroke rates of roughly 1.8 to 2.7 per 100 person-years across the drugs, with no meaningful separation between them. The choice often comes down to dosing preference, kidney function, side effect profile, and cost.
All three DOACs share a major practical advantage over warfarin: no routine blood tests and no dietary restrictions. For many patients, that convenience is the deciding factor. Warfarin still has a role, though, particularly for people with mechanical heart valves or certain types of valve disease where DOACs haven’t been proven safe.
Side Effects Across All Blood Thinners
Bleeding is the most common side effect of every blood thinner on this list. That can range from minor issues, like bruising more easily or having nosebleeds that take longer to stop, to serious events like gastrointestinal bleeding or, rarely, bleeding in the brain. Some people also experience nausea, upset stomach, or diarrhea.
The risk of serious bleeding varies by drug, dose, age, kidney function, and whether you’re taking other medications that also affect clotting. Taking an anticoagulant and an antiplatelet together (which some cardiac patients need) increases bleeding risk further.
What Happens Before Surgery
If you’re on a blood thinner and need a procedure, how far in advance you stop depends on which drug you take and how risky the surgery is. For minimal-risk procedures like basic dental work or minor skin procedures, most blood thinners can be continued.
For higher-risk surgeries, the hold times differ significantly:
- Warfarin: stop at least five days before surgery
- Apixaban, rivaroxaban, edoxaban: stop one to two days before surgery
- Dabigatran: stop one to two days before surgery, or up to four days if kidney function is reduced
- Clopidogrel: stop five days before surgery
- Ticagrelor: stop three to five days before surgery
- Prasugrel: stop seven to ten days before surgery
- Aspirin: often continued, but if stopped, typically within seven days of surgery
After the procedure, most blood thinners are restarted within 12 to 24 hours once bleeding has been controlled. These timelines are guidelines, and your surgical team will adjust based on your specific situation and clot risk.
Emergency Reversal
One important difference between blood thinners is how quickly their effects can be reversed if serious bleeding occurs. Warfarin can be reversed with vitamin K and clotting factor concentrates. Dabigatran has its own dedicated reversal agent that works within minutes. Apixaban and rivaroxaban share a reversal agent that binds and neutralizes the drug, though it’s typically reserved for life-threatening situations. Antiplatelets like aspirin and clopidogrel have no specific reversal agent; in emergencies, doctors may use platelet transfusions instead.
If you carry a medical ID card or wear an alert bracelet listing your blood thinner, emergency providers can act faster. This is especially relevant for people on anticoagulants who are at risk of falls or traumatic injury.