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Warfarin

Most Commonly Used
Warfarin 5mg Tab
Barr Laboratories Inc a Division of Teva USA
Pill Identification: 833 5  |  barr
Drug Image file DrugItem_3869.JPG
Warfarin 4mg Tab
Barr Laboratories Inc a Division of Teva USA
Pill Identification: 874 4  |  barr
Drug Image file DrugItem_3873.JPG
Warfarin 2mg Tab
Barr Laboratories Inc a Division of Teva USA
Pill Identification: 869 2  |  barr
Drug Image file DrugItem_3872.JPG
Warfarin 3mg Tab
Barr Laboratories Inc a Division of Teva USA
Pill Identification: 925 3  |  barr
Drug Image file DrugItem_3886.JPG
Warfarin 1mg Tab
Barr Laboratories Inc a Division of Teva USA
Pill Identification: 831 1  |  barr
Drug Image file DrugItem_6193.JPG
Also See:
  • Answers to Frequently-Asked Questions (FAQs)
  • Other Class Related Drugs
  • Additional Patient Usage Statistics


Common Side Effects of Warfarin
Before taking warfarin, let your doctor know if you have a bleeding disorder, kidney or liver disease, heart failure, high blood pressure, or diabetes. Also, let your doctor know if you have a tendency to fall often. Tell your doctor if you are pregnant, breast-feeding, or planning to become pregnant. Notify your doctor right away if you become pregnant while taking warfarin.

The right dose of warfarin and how your body responds to it are very unique to you. Your doctor may want to do a genetic test to find out how your body responds to warfarin. Many things can change the level of warfarin in your body. Your doctor will want you to get regular blood tests, called INR tests, to check your response to warfarin. Your dose of warfarin will be adjusted from time to time to keep your INR level at the right level.

Tell your doctor about any medicines you take. Include prescription medicines, over-the-counter medicines, herbal remedies, vitamins, and other supplements. Many medicines interact with warfarin. Even aspirin can be dangerous to take with warfarin. While taking warfarin, always tell your doctor before you start any new medicine.

Because warfarin interferes with blood clotting, injuries can be especially dangerous. If you participate in sports or other activities that have the potential for physical injury, warfarin may not be right for you. Talk with your doctor about what activities are safe for you while taking warfarin. Your doctor may advise you to wear a medical alert bracelet indicating that you take warfarin.

Make sure all your health care providers, including your dentist, know that you take warfarin. If you need any type of surgery, you may need to briefly stop taking warfarin. Warfarin can even be a concern during routine immunizations, including flu shots.

Warfarin can cause some serious side effects. Seek emergency help right away for:
  • Signs of an allergic reaction: itching or hives; swelling or tingling in the face, mouth, throat, or hands; chest pain or tightness; or trouble breathing or swallowing
  • Signs of bleeding, including any unusual bruising or bleeding, bleeding that doesn't stop in an expected amount of time, coughing or vomiting blood or a substance that looks like coffee grounds, nosebleeds or bleeding gums, increased menstrual flow or vaginal bleeding, black tarry stools, or urine that is dark brown, red, or pink
  • Nausea or vomiting
  • Swelling of hands or feet, or sudden weight gain
  • Pain or change in color or temperature to any part of your body, including painful, blue, or purple toes
  • Headache, dizziness, or weakness
  • Fever, chills, sore throat, or cough
  • Confusion, dizziness, fainting, or light-headedness
  • Excessive drowsiness, tiredness, or loss of consciousness
  • Numbness, tingling, or weakness
  • Difficulty with movement
  • Painful, prolonged erection
This is not a complete list. Report any symptoms that seem alarming, get worse, or worry you.

Less serious warfarin side effects may include:
  • Tiredness
  • Hair loss
  • Intestinal gas
  • Mild headache or body pains
  • Feeling cold or having chills
While taking warfarin, learn what foods are high in vitamin K. These include green leafy vegetables, asparagus, broccoli, brussels sprouts, cabbage, plums, rhubarb, and certain vegetable oils. Do not make big changes in the amount of foods high in vitamin K you eat on a daily basis while taking warfarin.