The DAPT medical abbreviation stands for dual antiplatelet therapy, which means taking two medicines that make platelets less sticky at the same time. In almost every case, one of them is aspirin and the other is a medicine from a group called P2Y12 inhibitors, such as clopidogrel, prasugrel or ticagrelor.
DAPT appears mainly in cardiology notes. It is common after a heart stent is placed during a PCI, after an acute coronary syndrome and in some stroke care plans. This page explains what the two parts do, why the plan has a set length, how to read it in a note, and what questions are worth asking.
At a glance
Stands for
Dual antiplatelet therapyUsual pairing
Aspirin (ASA) plus a P2Y12 inhibitorP2Y12 examples
Clopidogrel, prasugrel, ticagrelorWhere you see it
Cardiology notes, cath lab reports, discharge summaries, stroke notesSpecialty
Cardiology, interventional cardiology, neurologyDo not confuse with
Anticoagulants such as warfarin or a DOAC, which work on clotting factors instead
What the DAPT medical abbreviation describes
Platelets are small blood cells that clump together to start a clot. That is helpful after a cut, but inside a narrowed heart artery or a new stent, a platelet clot can block blood flow. Antiplatelet medicines reduce that clumping. Using two that work in different ways gives stronger protection than one alone during the period of highest risk.
Aspirin blocks one pathway inside platelets. The P2Y12 inhibitors block a different receptor on the platelet surface. Together they make up DAPT. When the planned course ends, many people continue with one antiplatelet medicine on its own, which notes call single antiplatelet therapy, or SAPT.
Why DAPT follows a heart stent
During a PCI, a cardiologist opens a blocked artery and usually places a small mesh tube called a stent. Most modern stents release medicine slowly and are called drug eluting stents, shortened to DES. Until the lining of the artery grows over the metal, the stent surface can attract platelets. DAPT lowers the chance of a clot forming inside the stent during that time.
DAPT is also used after a heart attack, whether or not a stent was placed, and after some types of minor stroke or TIA, where a short course may be chosen by the neurology team.
Reading DAPT in a cardiology note
Notes about DAPT usually say which two drugs, when it started and how long it is planned to last.
| Piece | Plain meaning |
|---|---|
| S/p | Status post, meaning after |
| DES to LAD | A medicated stent set into the LAD, a main artery on the front of the heart |
| DAPT | Two antiplatelet medicines |
| aspirin and clopidogrel | The two drugs chosen |
| x 12 months | The planned length of the course |
Discharge summary line: "Do not interrupt DAPT without discussing with cardiology." This is a standard caution written for every clinician who sees the patient later, including dentists and surgeons, because stopping early can raise the risk of a stent clot.
How long DAPT lasts and what shapes it
There is no single length for everyone. Cardiologists weigh the risk of clotting against the risk of bleeding. After a stent for an acute coronary syndrome, a course of about a year is common. For a planned stent in a stable patient, or for someone at high bleeding risk, a shorter course may be chosen. Some people at high clotting risk stay on longer.
The main side effect of DAPT is bleeding, from easy bruising to more serious bleeding in the stomach or elsewhere. To protect the stomach, some patients on DAPT are also prescribed a PPI. Decisions about length and any changes belong with the cardiology team.
Questions to ask about a DAPT plan
Because DAPT is time limited and involves two medicines, a few questions help keep the plan clear.
- Which two medicines am I taking, and which one will I stay on after the course ends?
- What is the planned end date, and who will tell me when to change?
- What should I tell my dentist or another surgeon before any procedure?
- Which signs of bleeding should I report right away?
- Are any pain relievers or supplements a problem with these medicines?
For other medicine shorthand, the prescription and dosing hub lists related terms.
Here you get broad background on a heart care term. Your cardiologist and pharmacist are the right people to explain your own antiplatelet plan and any changes to it.
Frequently asked questions
What does DAPT stand for?
DAPT stands for dual antiplatelet therapy. It means taking aspirin together with a second antiplatelet medicine such as clopidogrel, prasugrel or ticagrelor.
Why is DAPT needed after a stent?
A new stent can attract platelets until the artery lining grows over it. Two antiplatelet medicines lower the chance of a clot forming in the stent during that time.
Is DAPT the same as a blood thinner?
People often call these medicines blood thinners, but they act on platelets, not on the clotting factors that warfarin and similar drugs affect. Notes keep the two groups separate.
How long do people stay on DAPT?
The length varies. A course of about a year is common after an acute coronary syndrome, but shorter or longer plans are used depending on clotting and bleeding risk.