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Coumadin (Warfarin)

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What is Generic?

What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.


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Coumadin is a medication for blood clot prevention available by prescription, used to prevent thromboembolism, pulmonary embolism, or DVT (deep vein thrombosis). Warfarin, an anticoagulant drug, works by preventing the formation of vitamin-K dependent clotting factors, thus reducing the chance of large blood clots traveling through the arteries of the body and creating the risk of an embolism in major organs. Purchase Coumadin from Canada and Canpharm for the best price.

What is an Embolism?

An embolism is a blood clot that blocks the flow of blood through an artery, creating the risk of oxygen starvation (ischemia) in organs relying on these arteries for oxygen-enriched blood. There are different types of embolisms, including pulmonary (lungs), brain, retinal (eyes), septic, amniotic, air, and fat embolisms. Deep vein thrombosis is the primary cause of pulmonary embolisms, and DVT becomes increasingly common in individuals in poorer health as they age, especially with risk factors like obesity, smoking, and heart disease.

Fact Table
Formula C19H16O4
License US DailyMed
Bioavailability 79–100%
Legal status Rx-Only
Chemical Name Warfarin
Elimination half-life 1 week
Dosage (Strength) 1mg to 3mg
Pregnancy Consult Doctor
Brands Coumadin
Protein binding 99%
PubChem CID 54678486
MedlinePlus a682277
ChEBI 10033
ATC code B01AA03
DrugBank DB00682
KEGG D08682
Routes of administration By mouth

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The standard dosage for Coumadin is to take one tablet once daily with or without food, or as indicated in your prescription.


The active ingredient in Coumadin is Warfarin.


Inform your doctor if you have a history of blood disorders such as anemia, hemophilia, bleeding problems, blood vessel disorders, kidney or liver disease, or frequent falls or injuries before starting Coumadin.

It is important to maintain a balanced, consistent diet while using Coumadin as a blood thinner.

Medication use may cause stomach bleeding and a general increase in bleeding if the user has a flesh wound. This risk is more pronounced in older individuals.

Women who are pregnant or planning to become pregnant should not use Coumadin unless their doctor approves it.


Negative drug interactions may occur between Coumadin and other prescription medications, including albuterol, allopurinol, amlodipine, atorvastatin, docusate, carvedilol, digoxin, furosemide, gabapentin, levothyroxine, lisinopril, metformin, metoprolol, omeprazole, oxycodone, prednisone, pantoprazole, simvastatin, and tramadol. Inform your doctor of all medications you are currently taking before proceeding to get a prescription and buy Coumadin online.

Side Effects

Coumadin side effects may occur, and some users may experience nausea, appetite loss, stomach or abdominal pain, or unusual tiredness. If side effects are experienced, you may want to discontinue use and consult a doctor to discuss alternatives for deep vein thrombosis treatment.

Frequently Asked Questions about Coumadin (Warfarin)

What is Coumadin/Warfarin?

Coumadin is the brand name for the generic drug warfarin, an anticoagulant or blood thinner that helps prevent blood clots.

Why is Coumadin prescribed?

Coumadin is prescribed to patients at high risk for developing harmful blood clots, often those with heart arrhythmias, prosthetic heart valves, deep vein thrombosis, pulmonary embolism, or stroke.

How does Coumadin work?

Coumadin blocks vitamin K needed for blood clotting, thinning the blood to prevent dangerous clots from forming and traveling to the heart, lungs, or brain.

What is the proper Coumadin dosage?

The proper Coumadin dose is highly individualized, requiring regular blood testing and dose adjustments to maintain therapeutic INR levels between 2-3 for most patients.

What are the side effects of Coumadin?

Potential Coumadin side effects include easy bruising/bleeding, vitamin K deficiency, skin necrosis, purple toes syndrome in high doses.

Can I take other medications while on Coumadin?

Some antibiotics, pain relievers, vitamins, herbal remedies can interact with Coumadin, so careful review of all new medications with your doctor is imperative.

What foods should I avoid while taking Coumadin?

Avoid major dietary changes and large amounts of foods high in vitamin K like leafy greens and some oils, as this can interfere with Coumadin therapy.

How often do I need blood tests on Coumadin?

Frequent blood tests, often weekly at first, are needed to monitor PT/INR levels and make any necessary Coumadin dosage adjustments.

What if I miss a dose of Coumadin?

Missing Coumadin doses can increase clot risk, so contact your doctor if more than one day is missed to discuss safety and determine next steps.

How long will I need to take Coumadin?

Length of Coumadin therapy depends on the condition being treated but is often long-term, especially for those with ongoing risk factors for blood clots.

IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.