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The pharmacists at the Anticoagulation Clinic are committed to providing quality clinical and educational services that are timely and responsive to the needs of patients, families, other health professionals and the community.
Warfarin is an anticoagulant that slows blood clotting and is used to prevent and treat people with blood clots in the veins (venous thrombosis) and blood clots in the lungs (pulmonary embolism). Warfarin is also used to treat or prevent dangerous blood clotting in people with atrial fibrillation (an irregularity in heart beat) and in some cases, to prevent strokes.
Since warfarin increases the risk of bleeding, please take a look at over-the-counter medications before you take them.
Avoid these supplements when taking warfarin since the supplement may decrease the absorption and/or activity of warfarin in the body:
Green tea ( may decrease INR)
St. John’s Wort
Vitamin C/Zinc/Iron/Magnesium (consult with your pharmacist)
Avoid these supplements when taking warfarin because taking them together may cause undesirable or dangerous results:
Asian ginseng (increased risk of bleeding, decreased platelet function)
Dong quai (decreased platelet function)
Garlic (increased risk of bleeding, decreased platelet function)
Ginger (increased risk of bleeding, decreased platelet function)
Gingko biloba (decreased platelet function)
Quinine (increased risk of bleeding)
Vitamin K (decreased INR)
Before taking any of these supplements, please consult with the pharmacist about potential interaction:
Soy products (may increase INR)
Vitamin C (if taken in excess, may decrease INR)
Vitamin E (if taken in excess, may decrease INR)
Please take Tylenol®/acetaminophen (not to exceed 4 grams per day) for your occasional pain/headache.
Please consult with your doctor if you need increased pain relief. If you have underlying liver dysfunction, you Tylenol/acetaminophen intake should not exceed 2 grams per day.
This is not a complete list of products containing ingredients that can interact with Coumadin® (warfarin). Please check the active ingredients of combination cold and pain relief products since these medications often contain aspirin or ibuprofen.
If you have any questions regarding any medications that you are taking, please call 650-725-4932.
All patients must be referred by a Stanford doctor.
For blood draw only, contact us for a requisition order good for six months. We request that routine blood draws be done for patients who cannot be seen during the regular Oral Anticoagulation Clinic appointments.
PREPARE FOR YOUR APPOINTMENT
Your initial visit will be a one-hour education session about Warfarin use including side effects, drug and diet interactions, and clinic policies.
AFTER YOUR APPOINTMENT
Have your INR checked if you have not seen us for a long time.
Get updated labels once a month at the registration desk.
Labels given to you at admitting must be attached to your samples/records.
Keep an updated list of medications with you to review at your visits.
Stanford Health Care provides comprehensive services to refer and track patients, as well as the latest information and news for physicians and office staff. For help with all referral needs and questions, visit Referring Physicians.
Track your patients' progress and communicate with Stanford providers securely online.