Most people take two blood thinners together for 6 to 12 months after a coronary stent, then continue low-dose aspirin indefinitely. The exact duration depends on why you needed the stent, your risk of bleeding, and whether you had a heart attack. Your cardiologist may shorten this to as little as one month or extend it well beyond a year based on your individual profile.
The two-drug combination is called dual antiplatelet therapy, or DAPT. It pairs a low-dose aspirin (usually 81 mg daily) with a second platelet-blocking medication. This combination prevents blood clots from forming inside the stent while the artery heals around it.
The Standard Timeline
If your stent was placed during or after a heart attack (or another acute coronary event), the standard course is 12 months of DAPT. This longer timeline reflects the higher clotting risk that comes with unstable heart disease. The artery that caused the event is inflamed and more prone to forming new clots, so the extra months of protection matter.
If your stent was placed for stable coronary artery disease, meaning a planned procedure for a narrowed artery that hadn’t caused a heart attack, the minimum is typically 6 months. Some newer evidence supports even shorter courses in the right patients, which we’ll cover below.
After the DAPT period ends, you stop the second medication but keep taking low-dose aspirin. For most stent patients, aspirin is a lifelong commitment. It provides a baseline level of clot protection for as long as the stent is in your body.
Which Medications You’ll Take
The aspirin component stays the same for everyone. The second drug is where your prescription may differ. The three options are clopidogrel, ticagrelor, and prasugrel. All three block the same clotting signal on your platelets, but they vary in strength and dosing.
Clopidogrel is the most widely prescribed, taken once daily at 75 mg after an initial higher loading dose. It’s the go-to for stable patients and those who need a gentler option. Ticagrelor is more potent and taken twice daily at 90 mg per dose. Prasugrel, also taken once daily at 10 mg, provides the strongest platelet-blocking effect of the three. For patients over 75 or under 60 kg (about 132 pounds), prasugrel is either avoided or reduced to 5 mg because the bleeding risk climbs in those groups.
Heart attack patients are generally started on ticagrelor or prasugrel because clinical trials showed both reduced the risk of another cardiac event compared to clopidogrel. If those stronger options aren’t tolerated or are unavailable, clopidogrel remains effective.
When Doctors Shorten the Course
Not everyone can safely take two blood thinners for six months or a year. People with a high risk of bleeding, whether from age, kidney disease, recent surgery, or a history of gastrointestinal bleeds, may be candidates for a shortened course of just one to three months.
A large study of over 3,300 patients compared one-month DAPT to three-month DAPT in high-bleeding-risk individuals. The rates of death or heart attack were nearly identical between the two groups, regardless of whether patients were over or under 75. Among patients 75 and older, those on just one month of DAPT had notably less bleeding: 7.2% experienced a significant bleed compared to 9.4% in the three-month group. The takeaway is that for carefully selected patients, a shorter course can meaningfully reduce bleeding complications without increasing heart risk.
Newer-generation stents have made shorter courses more feasible. Modern drug-eluting stents have thinner struts and coatings that promote faster healing of the artery wall, which means the window of vulnerability to stent clotting is shorter than it was with older designs.
When Doctors Extend Beyond a Year
Some patients benefit from continuing DAPT past the 12-month mark, sometimes for an additional 18 months or longer. Cardiologists use a scoring tool called the DAPT score to weigh this decision. It assigns points based on factors that raise clotting risk and subtracts points for factors that raise bleeding risk.
You gain points for things like having diabetes, a prior heart attack, being a current smoker, or having small-diameter stents. You lose points for older age: one point subtracted for ages 65 to 74, and two points for 75 and above. A total score of 2 or higher suggests that extending therapy is worthwhile. In that group, roughly 1 in 34 patients avoids a clotting event thanks to the extra time on medication, while the risk of causing a serious bleed is about 1 in 272. Those are favorable odds.
For patients who score below 2, the math flips. Continuing DAPT beyond a year prevents an event in about 1 in 153 patients, but causes a harmful bleed in about 1 in 64. In that scenario, stopping at 12 months is the safer choice.
What Happens If You Stop Too Early
Stopping your blood thinners before the prescribed course is one of the most dangerous things you can do after getting a stent. When the medication is withdrawn prematurely, a blood clot can form inside the stent, a condition called stent thrombosis. This can cause a heart attack that is often more severe than the original event because the clot completely blocks an artery that was already compromised.
One study of patients with older first-generation stents found a definite stent thrombosis rate of 8.2% over three years in a higher-risk subgroup. In case reports, clots have formed as quickly as one month after stopping antiplatelet therapy. Even with newer stents, the risk is real. The first several months after stent placement carry the highest danger because the metal surface hasn’t yet been fully covered by a new layer of arterial tissue.
If you’re running into side effects, cost issues, or difficulty keeping up with the medication schedule, talk to your cardiologist before making any changes. There are often alternatives or dose adjustments that keep you protected without the problem you’re experiencing.
Dental Work and Surgery During DAPT
One of the most common practical concerns is what to do if you need a tooth pulled, a biopsy, or another procedure while you’re still on blood thinners. The instinct of many surgeons and dentists is to stop the medication beforehand, but this can be risky so soon after a stent.
Research on dental extractions in stent patients found that continuing DAPT, and even triple antiplatelet therapy, during the procedure was safe. In a study of patients who had teeth extracted while on their full medication regimen, only 2% experienced any notable bleeding, and none had a serious cardiovascular event. The study concluded that dental extractions don’t need to be delayed regardless of how recently the stent was placed, as long as platelet counts are adequate.
For more invasive surgeries, the calculus is more complex. Your cardiologist and surgeon will typically coordinate to find the safest window: ideally after your minimum DAPT period is complete, or with the shortest possible interruption of the second drug while continuing aspirin. Elective surgeries are almost always postponed until the critical DAPT window has passed.
Bleeding Signs to Watch For
While you’re on DAPT, you’ll bruise more easily and bleed longer from minor cuts. That’s expected. What you need to recognize are the signs of more serious internal bleeding.
- Gastrointestinal bleeding: black or tarry stools, vomiting blood or material that looks like coffee grounds, or new persistent stomach pain.
- Intracranial bleeding: a sudden severe headache unlike any you’ve had before, confusion, vision changes, difficulty speaking, or weakness on one side of the body.
- Significant blood loss from any site: feeling lightheaded, unusually fatigued, or noticing your heart racing without exertion. These can signal that you’ve lost enough blood to affect circulation.
Minor bleeding like gum bleeding when brushing, small nosebleeds, or easy bruising doesn’t typically require a change in treatment. But any of the symptoms above warrants immediate emergency evaluation, because the decision to pause or adjust your blood thinners needs to be made by a medical team that can monitor you in real time.