Jantoven prevents and treats blood clots. Don't drink alcohol while on Jantoven. Don't make changes in your diet (eating large amounts of green, leafy vegetables) as this may affect how it works.

Jantoven Overview

Reviewed: June 4, 2013

Jantoven is a prescription medication used to lower the chances of blood clots forming in your body due to various causes. Jantoven belongs to a group of drugs called anticoagulants or "blood thinners". It helps prevent blood clots from forming by decreasing the formation of substances in the blood known as clotting factors. Careful monitoring of side effects is required using regular blood tests.

This medication comes in tablet form. Jantoven is usually taken once daily, with or without food. The dosage will vary depending on the results of your PT/INR test (blood test).

Common side effects of Jantoven are nausea, vomiting, and an altered sense of taste. Seek medical attention if you experience bruising or bleeding.

How was your experience with Jantoven?

First, a little about yourself

Tell us about yourself in a few words?

What tips would you provide a friend before taking Jantoven?

What are you taking Jantoven for?

Choose one
  • Other
  • Atrial Fibrillation
  • Coronary Thrombosis
  • Ischemic Attack, Transient
  • Myocardial Infarction
  • Postoperative Complications
  • Pulmonary Embolism
  • Stroke
  • Thromboembolism
  • Thrombophlebitis
  • Venous Thrombosis

How long have you been taking it?

Choose one
  • Less than a week
  • A couple weeks
  • A month or so
  • A few months
  • A year or so
  • Two years or more

How well did Jantoven work for you?

Did you experience many side effects while taking this drug?

How likely would you be to recommend Jantoven to a friend?

Jantoven Cautionary Labels


Uses of Jantoven

Jantoven is a prescription medication used to lower the chances of blood clots forming in your body due to various causes.

This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information.

Jantoven Drug Class

Jantoven is part of the drug class:

Side Effects of Jantoven

Jantoven can cause serious side effects. See "Drug Precautions" section.

Common, less serious side effects include:

  • nausea
  • vomiting
  • diarrhea
  • changes in taste
  • stomach pain
  • gas
  • bloating
  • hair loss
  • rash
  • chills

This is not a complete list of Jantoven side effects. Ask your doctor or pharmacist for more information.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088


Jantoven Interactions

Many medicines, including prescription and non-prescription medicines, vitamins and herbal supplements can interact with Jantoven and affect the dose you need, or increase Jantoven side effects.

Some of the medications known to interact with Jantoven are:

  • aspirin
  • ibuprofen (Motrin, Advil)
  • naproxen (Aleve)
  • acetaminophen (Tylenol)
  • some antibiotics
  • heparin
  • cold medicines
  • allergy medicines
  • birth control pills
  • amiodarone

There are many more medicines that interact with Jantoven. Before taking a new medicine, check with your doctor or pharmacist to be certain it won't interact with Jantoven.

  • Do not take other medicines that contain warfarin. Warfarin is the active ingredient in Jantoven.

Jantoven Precautions

Jantoven can cause serious side effects. Call your healthcare provider right away if you get any of the following signs or symptoms of bleeding problems:

  • pain, swelling, or discomfort
  • headaches, dizziness, or weakness
  • unusual bruising (bruises that develop without known cause or grow in size)
  • nosebleeds
  • bleeding gums
  • bleeding from cuts takes a long time to stop
  • menstrual bleeding or vaginal bleeding that is heavier than normal
  • pink or brown urine
  • red or black stools
  • coughing up blood
  • vomiting blood or material that looks like coffee grounds

Serious side effects of Jantoven also include:

  • death of skin tissue (skin necrosis or gangrene). This can happen soon after starting Jantoven. It happens because blood clots form and block blood flow to an area of your body. Call your healthcare provider right away if you have pain, color, or temperature change to any area of your body. You may need medical care right away to prevent death or loss (amputation) of your affected body part.
  • “purple toes syndrome.” Call your healthcare provider right away if you have pain in your toes and they look purple in color or dark in color.

Other side effects with Jantoven include:

  • allergic reactions
  • liver problems
  • low blood pressure
  • swelling
  • low red blood cells
  • paleness
  • fever

Do not take Jantoven if:

  • your chance of having bleeding problems is higher than the possible benefit of treatment. Your healthcare provider will decide if Jantoven is right for you. Talk to your healthcare provider about all of your health conditions.
  • you are pregnant or plan to become pregnant. Jantoven can cause death or birth defects to an unborn baby. Use effective birth control if you can get pregnant.
  • you are allergic to Jantoven or to anything else in Jantoven.

What to Avoid:

  • Do not start, stop, or change any medicine without talking with your healthcare provider.
  • Do not make changes in your diet, such as eating large amounts of green, leafy vegetables.
  • Do not change your weight by dieting, without first checking with your healthcare provider.
  • Avoid drinking alcohol.
  • Do not do any activity or sport that may cause a serious injury.

Jantoven Food Interactions

Some foods can interact with Jantoven and affect your treatment and dose.

Eat a normal, balanced diet. Talk to your doctor before you make any diet changes. Do not eat large amounts of leafy green vegetables. Leafy green vegetables contain vitamin K. Certain vegetable oils also contain large amounts of vitamin K. Too much vitamin K can lower the effect of Jantoven.

Avoid drinking cranberry juice or eating cranberry products.

Avoid drinking alcohol.

Inform MD

Tell your healthcare provider about all of your health conditions, including if you:

  • have bleeding problems
  • fall often
  • have liver or kidney problems
  • have high blood pressure
  • have a heart problem called congestive heart failure
  • have diabetes
  • drink alcohol or have problems with alcohol abuse. Alcohol can affect your Jantoven dose and should be avoided.
  • are pregnant or breastfeeding

​Tell your doctor about all the medicines you take including prescription and non-prescription medicines, vitamins, and herbal supplements.


Jantoven and Pregnancy

Tell your doctor if you are pregnant or planning to become pregnant. Jantoven should not be taken during pregnancy. Jantoven can cause death or birth defects to an unborn baby.

The FDA categorizes medications based on safety for use during pregnancy. Five categories - A, B, C, D, and X, are used to classify the possible risks to an unborn baby when a medication is taken during pregnancy.

Jantoven falls into 2 categories: D for women with mechanical heart valves, and X for all other pregnant women. It has been shown that use of Jantoven in pregnant women caused some babies to be born with problems. However, because women with mechanical heart valves are at a high risk of thromboembolism (blood clot in blood vessel), the benefits of taking Jantoven may outweigh the risks.

Talk to your doctor about the risks of taking Jantoven during pregnancy.


Jantoven and Lactation

Studies have shown that Jantoven is not excreted in human milk. Caution should be exercised if you are breastfeeding and also taking Jantoven.

Jantoven Usage

  • Get your regular blood test to check for your response to Jantoven. This blood test is called a PT/INR test. The PT/INR test checks to see how fast your blood clots. Your healthcare provider will decide what PT/INR numbers are best for you. Your dose of Jantoven will be adjusted to keep your PT/INR in a target range for you.
  • Call your healthcare provider if you are sick with diarrhea, an infection, or have a fever.
  • Tell your healthcare provider about any planned surgeries, medical or dental procedures. Your Jantoven may have to be stopped for a short time or you may need your dose adjusted.
  • Call your healthcare provider right away if you fall or injure yourself, especially if you hit your head. Your healthcare provider may need to check you.
  • Always tell all of your healthcare providers that you take Jantoven.
  • Wear or carry information that you take Jantoven.

Take Jantoven exactly as prescribed. Your healthcare provider will adjust your dose from time to time depending on your response to Jantoven.

Take Jantoven at the same time every day. You can take Jantoven either with food or on an empty stomach.

If you miss a dose of Jantoven, call your healthcare provider. Take the dose as soon as possible on the same day. Do not take a double dose of Jantoven the next day to make up for a missed dose.

Call your healthcare provider right away if you take too much Jantoven.

Jantoven Dosage

Take Jantoven exactly as your doctor prescribes it. Follow the directions on your prescription label carefully.

Your doctor will adjust your dose from time to time depending on your response to Jantoven based upon your PT/INR.

Jantoven Overdose

If you take too much Jantoven, call your healthcare provider or local Poison Control Center, or seek emergency medical attention right away.

If Jantoven is administered by a healthcare provider in a medical setting, it is unlikely that an overdose will occur. However, if overdose is suspected, seek emergency medical attention.

Other Requirements

Store at controlled room temperature and protect from light. Keep this and all medicines out of the reach of children.

Jantoven FDA Warning

Bleeding Risk

  • Jantoven sodium can cause major or fatal bleeding. Bleeding is more likely to occur during the starting period and with a higher dose (resulting in a higher INR).
  • Risk factors for bleeding include high intensity of anticoagulation (INR greater than 4), age 65 or older, highly variable INRs, history of gastrointestinal bleeding, hypertension, cereberovascular disease, serious heart disease, anemia, malignancy, trauma, renal insufficiency, concomitant drugs, and long duration of Jantoven therapy.
  • Regular monitoring of INR should be performed on all treated patients. Those at high risk of bleeding may benefit from more frequent INR monitoring, careful dose adjustment to desired INR, and a shorter duration of therapy.
  • Patients should be instructed about prevention measures to minimize the risk of bleeding and to report immediately to physicians the signs and symptoms of bleeding.