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Jantoven (Warfarin)
Virtual visit

Jantoven (Warfarin)

With our quick and easy online prescription process, you can manage your health effortlessly — whether you need a first-time prescription for Jantoven (Warfarin) or a refill of an existing one.

Licensed providers in all 50 states

Expert-guided, evidence-based treatments

Skip the trip to the doctor's office

Visit options

Costs shown are for the visit only. You'll pay for medication at your preferred pharmacy.

Video Visit

$25

Est. or $100 w/o insurance

Chat Visit

$30

w/o insurance

Most insurance accepted

Board-certified

No hidden fees

Available nationwide

What is Jantoven (Warfarin)?

Jantoven is an oral anticoagulant—a blood thinner—used to prevent and treat blood clots in conditions including atrial fibrillation, deep vein thrombosis, pulmonary embolism, and after heart valve replacement. It works by blocking the vitamin K-dependent clotting factors the liver produces, reducing the blood's ability to form dangerous clots. Because warfarin's effect varies widely between individuals based on diet, genetics, and other medications, it requires regular INR blood tests to ensure the dose is in the therapeutic range—effective without being dangerously high.

Vitamin K antagonism

Inhibits the enzyme that recycles vitamin K, preventing the liver from producing functional clotting factors II, VII, IX, and X—reducing the blood's clotting ability in a measurable, adjustable way.

Adjustable anticoagulation

Unlike newer anticoagulants with fixed dosing, Warfarin's dose can be precisely titrated based on INR test results—allowing for fine-tuned anticoagulation in patients with complex needs or those requiring very specific therapeutic targets.

Long-established stroke and clot prevention

Decades of clinical use in atrial fibrillation, mechanical heart valves, and thromboembolic disease have established Warfarin as a foundational anticoagulant—particularly in situations where newer agents haven't been studied or aren't appropriate.

Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

All your care in one place. That’s the General Medicine difference.

We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
Clinician

What our customers have to say

“I feel like I’m finally on the right path to improving my health with the right support now! It’s so refreshing and reassuring.”

Emerald

“My experience with General Medicine was amazing. The understanding and care that was taken to figure out what is exactly going on with me. I feel like a weight has been lifted off of me.”

Kaylee

“I couldn’t be happier with my experience with General Medicine! They are fast, responsive, kind and knowledgeable. It is much easier, more affordable and faster.”

Nika

Get the care you need, without the wait.

Frequently Asked Questions

Why do I need such frequent blood tests with Jantoven?

Warfarin's anticoagulant effect varies with diet, other medications, and genetics. INR testing ensures the dose keeps you in the therapeutic range — effective enough to prevent clots without causing dangerous bleeding.

How does diet affect my Jantoven dose?

Foods high in vitamin K — leafy greens like spinach, kale, and broccoli — can reduce warfarin's effectiveness. Consistency is key: eat these foods regularly rather than avoiding them, so your dose can be calibrated accordingly.

What should I do if I miss a dose of Jantoven?

Take the missed dose as soon as you remember on the same day. If you miss an entire day, skip it — do not double up. Contact your clinician if you miss multiple doses, as INR monitoring may be needed.

What side effects might I experience?

Bleeding is the primary risk — ranging from easy bruising to serious internal bleeding. Signs like unusual bruising, blood in urine or stool, prolonged bleeding from cuts, or severe headache require immediate medical attention.

Are there foods or supplements I should avoid?

Cranberry juice, alcohol, and many herbal supplements including St. John's Wort, ginkgo, and garlic supplements can significantly affect INR levels. Always inform your clinician before starting any new supplement or herbal product.
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