What are anticoagulants?
Anticoagulants are medicines that keep your blood from clotting
as easily as usual. The most commonly used anticoagulants
include:
- abciximab
- aspirin
- clopidogrel
- eptifibatide
- heparin and low molecular weight heparin (LMWH)
- ticlopidine
- tirofiban
- warfarin.
How do they work?
Blood is an amazing substance. When blood clots, it turns from
a liquid into a solid. Blood clotting keeps the body from
losing too much blood from wounds. Anticoagulants are often
called blood thinners, but what they actually do is increase
the time it takes a blood clot to form.
When are they used?
Anticoagulants are used to treat conditions that cause unwanted
blood clots. They are also used during surgeries (such as
open-heart surgery) to prevent clotting. The right amount and
type of anticoagulant can prevent many problems.
Blood clots can cause problems, including:
- stroke, which blocks blood flow to the brain
- blockage of veins or arteries in the legs or in organs such
as the lungs and kidneys.
Aspirin, usually in doses of 1 tablet every other day, can
prevent or delay heart attacks and small strokes. Clopidogrel
and ticlopidine are used for the same purposes.
Warfarin is used to prevent repeated leg clots, heart attacks,
and certain kinds of stroke caused by a kind of irregular
heartbeat called atrial fibrillation.
Heparin and LMWH are used in hospitals or clinics because they
work right away but can have serious side effects if taken for
more than a few weeks. These drugs are used during heart valve
surgery, after hip replacement surgery, and for serious cases
of blood clots and heart attacks. While you are given heparin
in the hospital, you may need regular blood tests.
Abciximab, tirofiban, and eptifibatide are usually used for a
short time after you have had a heart attack or if you need to
have coronary angioplasty.
What should I watch out for?
You will need regular testing while you take warfarin. Keep
all appointments for these tests. Do not take aspirin while on
warfarin unless told to by your health care provider because it
may make your blood too slow to clot when clotting is needed.
Your diet affects the way warfarin works. If you are taking
warfarin, eat a healthy balanced diet with about the same
amount of vitamin K each day. Vitamin K is found in leafy
green vegetables, certain legumes, green tea, and vegetable
oils. Do not make big changes in your diet, such as eating a
lot more green leafy vegetables than you usually eat.
If you are taking any of these drugs, closely follow your
health care provider's instructions about doses and testing.
These are powerful drugs and need to be treated with respect.


Disclaimer: This content is reviewed periodically and is subject to
change as new health information becomes available. The
information provided is intended to be informative and educational and is not a
replacement for professional medical evaluation, advice, diagnosis or
treatment by a healthcare professional.
HIA File MED4277F.HTM Release 9.0/2006. Copyright © 2006 McKesson Corporation and/or one of its subdiaries. All Rights Reserved.
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