How It Works
This medicine prevents the formation of
Why It Is Used
Prevent a heart attack or stroke. Antiplatelet medicine is used to help lower the risk of a heart attack or stroke.
After a heart attack. Antiplatelet medicines might be used in the hospital after a heart attack to help blood to flow to the heart.
After angioplasty. If you had
angioplasty and now have a
stent, you will take antiplatelet medicines to help
prevent another heart attack or a stroke. You will probably take aspirin plus
another antiplatelet medicine. If you get a drug-eluting
stent, you will probably take both of these medicines for at least 1 year. If
you get a bare metal stent, you will take both medicines for at least 1 month
but maybe up to 1 year. Then you will likely take daily aspirin long term. If
you have a high risk of bleeding, your doctor may shorten the time you take
How Well It Works
Antiplatelet medicine, taken with
aspirin, helps lower the risk of a heart attack or stroke in people who have
had angioplasty with a stent. This medicine lowers the risk that blood will
clot in the stent and cause a heart attack.1
But for some people, clopidogrel does not work as well as it should, because their bodies may not be able to use the drug properly. Your doctor may do tests, such as a platelet test, to check on your blood clotting to make sure clopidogrel is working for you.1
All medicines have side effects. But many people don't feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.
Here are some important things to think about:
- Usually the benefits of the medicine are more important than any minor side effects.
- Side effects may go away after you take the medicine for a while.
- If side effects still bother you and you wonder if you should keep taking the medicine, call your doctor. He or she may be able to lower your dose or change your medicine. Do not suddenly quit taking your medicine unless your doctor tells you to.
Call 911 or other emergency services right away if you have:
Call your doctor if you have:
Call 911 or other emergency services right away if you have:
- A sudden, severe headache that is different from past headaches. (It may be a sign of bleeding in the brain.)
Call your doctor now or seek
immediate medical care if you have:
- Any abnormal bleeding, such as:
Other side effects of this medicine include:
See Drug Reference for a full list of side effects. (Drug
Reference is not available in all systems.)
What To Think About
Do not stop taking antiplatelet
medicine without talking to your doctor. Make sure you take this medicine,
especially if you have a stent. Antiplatelet medicine lowers the risk that
blood will clot in the stent and cause a heart attack.
Before any surgery or medical or dental procedure, be sure your doctor or dentist knows that you take an antiplatelet. You might need to stop taking your medicine for a short time beforehand.
Be sure your doctors know all of the medicines that you take. This includes prescription medicine, over-the-counter medicine, vitamins, supplements, and herbal remedies.
For other tips on taking this medicine safely, see:
Blood Thinners Other Than Warfarin: Taking Them Safely
Risk of bleeding
Antiplatelet medicine increases the risk of bleeding. This risk of bleeding is higher in some people. Your doctor will balance the benefits and risks of an antiplatelet based on your health. For example, you should not take prasugrel if you have had a stroke or transient ischemic attack (TIA), if you already have a bleeding problem, or if you need surgery very soon.
have a high risk of bleeding from taking an antiplatelet, your doctor may
suggest you take a
proton pump inhibitor or a histamine H2 acid reducer. This medicine may help prevent
bleeding in your stomach. If you are taking both aspirin and
an antiplatelet, talk with your doctor about how you can lower your risk of
Testing for clopidogrel
Your doctor may do tests, such as a platelet test, to check on your blood clotting to make sure clopidogrel is working for you.1
A genetic test might be used to see if you have genes that let your body use clopidogrel. But experts aren't yet sure whether genetic changes keep clopidogrel from preventing a heart attack or stroke.
Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don't take your medicines properly, you may be putting your health (and perhaps your life) at risk.
There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.
Advice for women
If you are pregnant, breast-feeding, or trying to get pregnant, do not use any medicines unless your doctor tells you to. Some medicines can harm your baby. This includes prescription and over-the-counter medicines, vitamins, herbs, and supplements. And make sure that all your doctors know that you are pregnant, breast-feeding, or planning to get pregnant.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments. And call your doctor if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.
Levine GN, et al. (2011). 2011 ACC/AHA/SCAI Guideline for percutaneous coronary intervention: A report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines and the Society for Cardiovascular Angiography and Interventions. Circulation, 124(23): e574–e651.
Primary Medical Reviewer
||Rakesh K. Pai, MD, FACC - Cardiology, Electrophysiology
Specialist Medical Reviewer
||Stephen Fort, MD, MRCP, FRCPC - Interventional Cardiology
Current as of
||March 12, 2014