of people worldwide are taking
blood thinners for hypercoagulation.
Millions of others are prescribed aspirin (a blood thinner)
to prevent arteriosclerosis,
despite side effects such as gastric irritation and bleeding.
herbs such as gingko and nutritional supplements such as vitamin E interact
with blood thinners? The answer is Yes,
and you should know about it.
The following Frequently Asked Question is excerpted from the October 15, 1997
issue of American Family Physician
does hypercoagulation mean?
When you get a cut, your body stops the bleeding by forming a blood clot (a
thickened mass). Substances in your blood (called proteins) work with tiny particles
(called platelets) to form the clot. Forming a clot is called "coagulation."
Coagulation helps when you are injured because it slows blood loss. However,
your blood shouldn't clot when it's just moving through your body. If blood
clots inside your blood vessels, it's called "thrombosis" or "phlebitis."
tendency to clot too much is called "hypercoagulation," and it can
be very dangerous.
is hypercoagulation dangerous?
When abnormal clots occur, they usually form inside veins (the vessels that
carry blood to the heart). A clot inside a blood vessel is called a "thrombus."
Sometimes the thrombus can travel in the bloodstream and get stuck in your lungs.
This kind of clot, called a "pulmonary embolus," keeps blood from
getting to your lungs.
A pulmonary embolus can be life-threatening.
clot that blocks a blood vessel in the brain can cause a stroke. A clot in a
blood vessel in the heart can cause a heart attack.
Blood clots can cause some women to have miscarriages.
In addition to proteins that help with clotting, your blood also has some proteins
that prevent clotting. Some of these are called protein C, protein S and antithrombin
III. Usually, these anti-clotting proteins are strong enough to stop clotting
in the veins when it shouldn't happen.
However, certain situations or risk factors can make it easier for your blood
to clot too much. These situations include the following:
Sitting on an airplane or in a car for a long time
Having prolonged bed rest (several days at a time)
Using birth control pills
Some people are born with a tendency to develop clots. This tendency is inherited
(it comes from your parents). Most of the time, increased clotting happens because
protein C in the blood isn't doing its job properly. This condition is called
"APC resistance" or "factor V Leiden."
In some people, the blood clots too much because their body doesn't make enough
protein C or protein S. This is called "protein C deficiency," or
"protein S deficiency," depending on which protein is missing. A few
people don't have enough antithrombin III, or have antithrombin III that doesn't
work. Some people have an extra protein in their blood that causes too much
clotting. This protein is called "lupus anticoagulant." Although it
is called "anticoagulant," it actually causes clotting.
Hypercoagulation has a few other causes, but those causes are rare.
How do I know if I have a problem with hypercoagulation?
Your doctor might think that you have a problem with hypercoagulation if you
have any of the following:
You have relatives with abnormal or excessive clotting
You had an abnormal clot when you were young
You got clots when you were pregnant or were using birth control pills
You have had several unexplained miscarriages
your doctor suspects you have hypercoagulation, tests can measure APC resistance,
protein C, protein S and antithrombin III in your blood and can check for the
lupus anticoagulant protein. The tests will also show if your proteins are working
the right way.
hypercoagulation be treated?
Yes. Several medicines can thin your blood and make it less likely to clot.
Some people with hypercoagulation only need to take
blood thinners when they're in a situation that makes them more likely to form
clots--like when they're in the hospital recovering from surgery, when they're
in a car or airplane for a long time and when they're pregnant. Other people
need to take medicine for the rest of their lives. Your
doctor will decide which group you're in.
What medicines can I take?
two most common blood thinners are called heparin and warfarin.
Your doctor will probably
give you heparin first, because heparin works right away. Heparin must be injected
with a small needle under the skin. Once the heparin starts working, your doctor
will probably have you start taking oral warfarin. Warfarin takes longer to
are the side effects of these medicines?
Both medicines can cause you to bleed more easily. You might notice that, if
you cut yourself, the blood takes longer to clot. You might bruise more easily.
If you have any unusual or heavy bleeding, call your doctor.
Warfarin has a stronger effect on some people than on others. If you take
warfarin, your doctor will want to check you often with a blood test called
the PT-INR (International Normalized Ratio). This test will tell your doctor
how well the warfarin is working. Some other medicines can make warfarin
more or less strong. Ask your doctor before you take a new medicine, even nonprescription
medicines and vitamins.
If you're pregnant, you shouldn't take warfarin. Warfarin can cause birth defects.
Instead, you must use heparin until after you have your baby. If you want to
get pregnant and you're already taking warfarin, talk with your doctor about
changing to heparin. Sexually active women who take warfarin should use birth
Thinners and Nutritional Supplement
natural substances have blood-thinning properties.
A possible risk exists when taking such a product while also taking Coumarins
(coumadin-like substances), salicylates (aspirin-like substances) and anti-platelets
(substances that prevent blood cells from clumping together) as these are
all considered blood thinners. Too much blood thinning can lead to excessive
Herbs containing coumadin:
arnica flower,anise, asafoetida,celery,chamomile,fenugreek,horse chestnut,licorice
root,lovage root,parsley,passionflower herb,quassia. red clover
Herbs thought to
Herbs with Anti-platelet
are no documented reports of a proven interaction between Coumadin and any of
these herbs. However,
patients taking these herbs while on Coumadin should be closely watched for
signs of bleeding. Herbs
that potentiall can increase bleeding time should be stopped at least 2 weeks
before surgery and not be taken until approval of the treating physician.
Nearly all available information on herb-Coumadin interactions is based on lab
studies, animal studies, or individual case reports. Cause and effect relationships
have not been proven.
Available reports give limited information about the severity of these interactions.
There is little reliable information about the safety and effectiveness of most
herbal products. There are no regulations governing purity and potency of
herbal products during manufacturing.
The following may increase
bleeding risk: Angelica
root, Arnica flower, Anise, Asafoetida, Bogbean, Borage seed oil, Bromelain,
Capsicum, Celery, Chammomile, Feverfew, Garlic, Ginger, Ginkgo, Horse chestnut,
Licorice root, Lovage root, Eadowsweet, Onion, Parsey, Passionflower herb, Poplar,
Quassia, Red clover, Rue, Sweet Clover, Turmeric, Willow bark.
The following Does
increase bleeding risk:
Danshen, Devil's claw, Dong quai, Papain, Vitamin E
following may lessen Coumadin's effect:
Coenzyme Q10, Ginseng
Vitamin E is usually taken
as a food supplement. The RDA is 15 I.U per day. Most health conscious
people take about 400 I.U. a day , and therapeutic dosages ranges from 400
to 1600 I.U. a day under the care of a knowledgeable physician.
As vitamin E is a fat-soluble vitamin, it
is not recommended to consume a large dose of it when not under close supervision.
The primary reason being that Vitamin E is a strong anti-oxidant
and may slow down the rate of oxidation of vitamin K in the body. Vitamin K
oxidation is essential to the body as it helps blood to clot. However, it
must also be noted that the effects of vitamin E on PT time ( a measure of bleeding
time and therefore the coagulation status) varies and is not constant. In
other words, the reaction of each person may be different.
There was a case reported of a 55 year-old
man who was on Coumadin and unknowingly took 1200 IU of vitamin E daily without
the supervision of a doctor. The normal recommended amount is 400 IU to 800 IU a
day and he was obviously taking an overdose of it. What happened then? The poor
man developed blood vessel ruptures under the skin, had blood in his urine and a
high PT time. When this happened, the doctor took him off vitamin E and his
condition was stabilized. Later, he was again given a high dose at of vitamin E
at 800 IU of vitamin E to provoke and confirm the response. Indeed, the
provocation is positive and the same problems appear again. His intake of
vitamin E was then stopped indefinitely. Within a week, his PT returned to
A study was conducted on 12 patients who
were on Coumadin. They were given 100 or 400 IU of vitamin E each day for a
period of one month. The results showed no unusual bleeding in the patients who
were given both dosages of vitamin E.
In another study, researchers Kim and White
conducted a randomized, double-blinded study in which 4 patients were given 1200
IU vitamin E daily. Another 3 were given 800 IU daily and another 4 took
placebo. All these patients took the vitamin E for a period of 4 weeks. During
the study's second phase, which was single-blinded and not randomized, 6 of the
subjects were given placebo or vitamin E. All of them were given 1200 IU daily
for another 4 weeks. The results revealed that their INR did not increase to a
point requiring Coumadin dose adjustment.
therefore safely conclude that taking Vitamin E up to 400 units per day does not
affect the PT time in patients on Coumadin, generally speaking. But
since each person is different, it is always good to consult your physician. A
word of advise. If you are on blood thinners
and taking vitamin E at the same time, do have your INR checked 2 weeks after
embarking on this combination. Close monitoring every month, at least for the
first 3 months should be carried out if you are on this combination therapy.
Tea (Camellia sinensis), also known as Chinese tea is famous for its unique
abilities to prevent cancers, treat stomach disorders and improve mental function.
Although dried green tea leaves contain substantial amounts of vitamin K and
may work against Coumadin, brewed green tea does not contain a significant amount
of the vitamin. However, large amounts of brewed green tea may alter Coumadin's
Research on green tea and bleeding time is
not widely available. There are periodic case reports. In one case, the INR of a
44 year-old patient with a mechanical heart valve dropped tremendously when he
took a large amount of brewed green tea. This patient originally had a normal
INR of 3.79. After taking ½ to 1 gallon of brewed green tea daily for about a
week, his INR dropped to 1.37.
if you drink brewed green tea in moderate amounts, your INR should not drop so
Ginkgo (Ginkgo biloba) is a herb used to
promote mental health and function. One of the components of Ginkgo called
Ginkgolide B is known to reduce coagulation. It acts as a blood thinner,
increasing blood flow to the brain and enhance memory. This herb have been used
for centuries by Asians. When taking this supplement, we have to be very careful
as several cases of bleeding were allegedly reported.
In one reported case, an elderly 70
year-old man took 40 mg of concentrated ginkgo extract twice a day for a period
of one week. At the same time, he was also taking 325mg of aspirin daily. He
complained of blurred vision and was diagnosed with a spontaneous hemorrhage in
A 33 year-old woman complained of headaches
and was later diagnosed with bruises around her spine. She had been taking 60mg
of ginkgo twice a day for 2 years.
In another report, a 72 year-old woman was
diagnosed with a subdural bruise after taking 50mg of ginkgo 3 times a day for a
period of 6 months. Interesting enough, she did not have any bleeding resulting
from taking both Coumadin and ginkgo. However, it
is strongly recommended those who are taking Coumadin avoid ginkgo-containing
Over many decades, Garlic (Allium sativum)
is believed to have several cardiovascular benefits, such as blood pressure
lowering, cholesterol lowering, and anti-stroke activity. Additionally, garlic
oil can also reduce blood coagulation.
A researcher had indicated that when
essential garlic oil was mixed with blood samples from healthy individuals,
cells were less likely to clump together (coagulate) in a laboratory setting.
Although there had been no documented reports of any serious interaction effects
when taking both Coumadin and garlic, studies had implied that a serious
reaction might be possible.
patients who are on Coumadin should avoid excessive
garlic supplements. However, by just eating food containing small
amounts of garlic and small amount of garlic pills should not be a problem.
ginger (Zingiber officinale) has been taken to curb motion sickness and arthritis.
Today, it has been reported to reduce blood clotting. Like the rest of the natural
supplements mentioned above, taking ginger supplements, which contain a higher
amount of ginger than any other food products may increase the risk of bleeding
when taken with Coumadin.
It is therefore highly recommended that
patients taking both Coumadin and ginger supplements have their INR checked
regularly. They should also ensure that symptoms of bleeding do not
Coenzyme Q10 (CoQ10) is a compound made
naturally in the human body, plant and animals. This compound is involved in
electron transport and may be a free-radical scavenger, an antioxidant and a
potent membrane stabilizer. CoQ10 is highly reputed for treating heart
disease patients. It can also help to stabilize high blood pressure and angina.
The structure of CoQ10 is very similar to
that of vitamin K 2. As such, it may have blood-coagulating effects. The vitamin
K-like effects of CoQ10 have since been demonstrated in a laboratory setting and
in the following reports: -
1. In Denmark, a 72 year-old woman
had a decreased response to Coumadin when she took CoQ10 as a supplement. Her
normal INR was only achieved when she stopped taking this product.
2. A 68 year-old man with a history
of stroke was stabilized with Coumadin for 6 years. His INR dropped after taking
30mg of CoQ10 daily for 2 weeks.
3. In another case, a 72 year-old
man and a 70 year-old woman saw their INR going downwards within 2 weeks of
starting on CoQ10. Their INR returned to normal after stopping the intake of
CoQ10 and Coumadin are taken simultaneously, patients should be monitored carefully
for the first few weeks.
Hypercoagulation is a state where the blood in the body
has an increased tendency to stick together. The causes are many, and a state
of hypercoagulation is a medical condition normally managed by the
administration of blood thinners such as coumadin or warfarin. Herbs and
selected vitamins also have blood thinning effect. The most common and well
known ones include gingko, vitamin E, and
garlic, among others.
Most people taking low preventative dose
of these do not experience any adverse health problem such as excessive
bleeding. To be safe, all
patients currently on blood thinner medications should let their physician know
the precise type and dosage of nutritional supplements being taken to avoid any
side effect. Side effect can vary from person to person, and each person is
Those preparing for surgery should also be mindful to
stop intake of nutritional supplements that potentially
have blood thinner effect as least 2 weeks before surgery.
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