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Jantoven Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 12/2/2015

Jantoven (warfarin sodium) is an anticoagulant (blood thinner) used to prevent heart attacks, strokes, and blood clots in veins and arteries. Jantoven is available in generic form. Common side effects of Jantoven include nausea, vomiting, loss of appetite, stomach/abdominal pain, bloating, gas, or changes in the sense of taste.

The dose of Jantoven is individualized, and is based on clinical findings. Jantoven can interact with herbal (botanical) products including: bromelains, coenzyme Q10, danshen, dong quai, garlic, ginkgo biloba, ginseng, or St. John's wort. Jantoven interacts with many other drugs, and these interactions can be dangerous, even fatal. Tell your doctor all prescription and over-the-counter medications and supplements you use. Jantoven is not recommended for use during pregnancy because of serious (possibly fatal) harm to a fetus. Discuss birth control with your doctor. If you become pregnant or think you may be pregnant, tell your doctor. Consult your doctor if you plan to become pregnant. Your doctor may switch the type of medication you use during pregnancy. Very small amounts of this medication may pass into breast milk but it is unlikely to harm a nursing infant. Consult your doctor before breastfeeding.

Our Jantoven (warfarin sodium) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Jantoven in Detail - Patient Information: Side Effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using warfarin and call your doctor at once if you have a serious side effect such as:

  • pain, swelling, hot or cold feeling, skin changes, or discoloration anywhere on your body;
  • sudden and severe leg or foot pain, foot ulcer, purple toes or fingers;
  • sudden headache, dizziness, or weakness;
  • unusual bleeding (nose, mouth, vagina, or rectum), bleeding from wounds or needle injections, any bleeding that will not stop;
  • easy bruising, purple or red pinpoint spots under your skin;
  • blood in your urine, black or bloody stools, coughing up blood or vomit that looks like coffee grounds;
  • pale skin, feeling light-headed or short of breath, rapid heart rate, trouble concentrating;
  • dark urine, jaundice (yellowing of the skin or eyes);
  • pain in your stomach, back, or sides;
  • urinating less than usual or not at all;
  • numbness or muscle weakness; or
  • any illness with diarrhea, fever, chills, body aches, or flu symptoms.

Less serious side effects may include:

  • nausea, vomiting, mild stomach pain;
  • bloating, gas; or
  • altered sense of taste.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Jantoven (Warfarin Sodium Tablets)

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Jantoven FDA Prescribing Information: Side Effects
(Adverse Reactions)


Potential adverse reactions to Jantoven® Tablets (Warfarin Sodium Tablets, USP) may include:

Rare events of tracheal or tracheobronchial calcification have been reported in association with long-term warfarin therapy. The clinical significance of this event is unknown. Priapism has been associated with anticoagulant administration, however, a causal relationship has not been established.

Read the entire FDA prescribing information for Jantoven (Warfarin Sodium Tablets)

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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