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Warfarin

Indications

Warfarin is used to prevent blood clots from forming or growing larger in your blood and blood vessels. It is prescribed for people with certain types of irregular heartbeat, people with prosthetic (replacement or mechanical) heart valves, and people who have suffered a heart attack. Warfarin is also used to treat or prevent venous thrombosis (swelling and blood clot in a vein) and pulmonary embolism (a blood clot in the lung). Warfarin is in a class of medications called anticoagulants ('blood thinners'). It works by decreasing the clotting ability of the blood.

Dosering

Warfarin comes as a tablet to take by mouth. It is usually taken once a day with or without food. Take warfarin at around the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take warfarin exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. Call your doctor immediately if you take more than your prescribed dose of warfarin. Your doctor will probably start you on a low dose of warfarin and gradually increase or decrease your dose based on the results of your blood tests. Make sure you understand any new dosing instructions from your doctor. Continue to take warfarin even if you feel well. Do not stop taking warfarin without talking to your doctor.

Voorzichtig

Before taking warfarin, tell your doctor and pharmacist if you are allergic to warfarin, any other medications, or any of the ingredients in warfarin tablets. Ask your pharmacist or check the Medication Guide for a list of the ingredients. do not take two or more medications that contain warfarin at the same time. Be sure to check with your doctor or pharmacist if you are uncertain if a medication contains warfarin or warfarin sodium. tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, and nutritional supplements you are taking or plan to take, especially acyclovir (Zovirax); allopurinol (Zyloprim); alprazolam (Xanax); antibiotics such as ciprofloxacin (Cipro), clarithromycin (Biaxin, in Prevpac), erythromycin (E.E.S., Eryc, Ery-Tab), nafcillin, norfloxacin (Noroxin), sulfinpyrazone, telithromycin (Ketek), and tigecycline (Tygacil); anticoagulants such as argatroban (Acova), dabigatran (Pradaxa), bivalirudin (Angiomax), desirudin (Iprivask), heparin, and lepirudin (Refludan); antifungals such as fluconazole (Diflucan), itraconazole (Onmel, Sporanox), ketoconazole (Nizoral), miconazole (Monistat), posaconazole (Noxafil), terbinafine (Lamisil), voriconazole (Vfend); antiplatelet medications such as cilostazol (Pletal), clopidogrel (Plavix), dipyridamole (Persantine, in Aggrenox), prasugrel (Effient), and ticlopidine (Ticlid); aprepitant (Emend); aspirin or aspirin-containing products and other nonsteroidal anti-inflammatory drugs such as celecoxib (Celebrex), diclofenac (Flector, Voltaren, in Arthrotec), diflunisal, fenoprofen (Nalfon), ibuprofen (Advil, Motrin), indomethacin (Indocin), ketoprofen, ketorolac, mefenamic acid (Ponstel), naproxen (Aleve, Naprosyn), oxaprozin (Daypro), piroxicam (Feldene), and sulindac (Clinoril); bicalutamide; bosentan; certain antiarrhythmic medications such as amiodarone (Cordarone, Nexterone, Pacerone), mexiletine, and propafenone (Rythmol); certain calcium channel blocking medications such as amlodipine (Norvasc, in Azor, Caduet, Exforge, Lotrel, Twynsta), diltiazem (Cardizem, Cartia XT, Dilacor XR, Tiazac) and verapamil (Calan, Isoptin, Verelan, in Tarka); certain medications for asthma such as montelukast (Singulair), zafirlukast (Accolate), and zileuton (Zyflo); certain medications used to treat cancer such as capecitabine (Xeloda), imatinib (Gleevec), and nilotinib (Tasigna); certain medications for cholesterol such as atorvastatin (Lipitor, in Caduet) and fluvastatin (Lescol); certain medications for digestive disorders such as cimetidine (Tagamet), famotidine (Pepcid), and ranitidine (Zantac); certain medications for human immunodeficiency virus (HIV) infection such as amprenavir, atazanavir (Reyataz), efavirenz (Sustiva), etravirine (Intelence), fosamprenavir (Lexiva), indinavir (Crixivan), lopinavir/ritonavir, nelfinavir (Viracept), ritonavir (Norvir), saquinavir (Invirase), and tipranavir (Aptivus); certain medications for narcolepsy such as armodafinil (Nuvigil) and modafinil (Provigil); certain medications for seizures such as carbamazepine (Carbatrol, Equetro, Tegretol), phenobarbital, phenytoin (Dilantin, Phenytek), and rufinamide (Banzel); certain medications to treat tuberculosis such as isoniazid (in Rifamate, Rifater) and rifampin (Rifadin, in Rifamate, Rifater); certain selective serotonin reuptake inhibitors (SSRIs) or selective serotonin and norepinephrine reuptake inhibitors (SNRIs) such as citalopram (Celexa), desvenlafaxine (Pristiq), duloxetine (Cymbalta), escitalopram (Lexapro), fluoxetine (Prozac, Sarafem, in Symbyax), fluvoxamine (Luvox), milnacipran (Savella), paroxetine (Paxil, Pexeva), sertraline (Zoloft), venlafaxine (Effexor) corticosteroids such as prednisone; cyclosporine (Neoral, Sandimmune); disulfiram (Antabuse); methoxsalen (Oxsoralen, Uvadex); metronidazole (Flagyl); nefazodone (Serzone), oral contraceptives (birth control pills); oxandrolone (Oxandrin); pioglitazone (Actos, in Actoplus Met, Duetact, Oseni); propranolol (Inderal) or vilazodone (Viibryd). Many other medications may also interact with warfarin, so be sure to tell your doctor about all the medications you are taking, even those that do not appear on this list. Do not take any new medications or stop taking any medication without talking to your doctor. tell your doctor and pharmacist what herbal or botanical products you are taking, especially coenzyme Q10 (Ubidecarenone), Echinacea, garlic, Ginkgo biloba, ginseng, goldenseal, and St. John's wort. There are many other herbal or botanical products which might affect your body's response to warfarin. Do not start or stop taking any herbal products without talking to your doctor. tell your doctor if you have or have ever had diabetes. Also tell your doctor if you have an infection, a gastrointestinal illness such as diarrhea, or sprue (an allergic reaction to protein found in grains that causes diarrhea), or an indwelling catheter (a flexible plastic tube that is placed into the bladder to allow the urine to drain out). if you are having surgery, including dental surgery, or any type of medical or dental procedure, tell the doctor or dentist that you are taking warfarin. Your doctor may tell you to stop taking warfarin before the surgery or procedure or change your dosage of warfarin before the surgery or procedure. Follow your doctor's directions carefully and keep all appointments with the laboratory if your doctor orders blood tests to find the best dose of warfarin for you. ask your doctor about the safe use of alcoholic beverages while you are taking warfarin. tell your doctor if you use tobacco products. Cigarette smoking may decrease the effectiveness of this medication.

Nevenwerking

Warfarin may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • gas
  • abdominal pain
  • bloating
  • change in the way things taste
  • loss of hair
  • feeling cold or having chills

If you experience any of the following symptoms, or those listed in the IMPORTANT WARNING section, call your doctor immediately:

  • hives
  • rash
  • itching
  • difficulty breathing or swallowing
  • swelling of the face, throat, tongue, lips, or eyes
  • hoarseness
  • chest pain or pressure
  • swelling of the hands, feet, ankles, or lower legs
  • fever
  • infection
  • nausea
  • vomiting
  • diarrhea
  • extreme tiredness
  • lack of energy
  • loss of appetite
  • pain in the upper right part of the stomach
  • yellowing of the skin or eyes
  • flu-like symptoms
You should know that warfarin may cause necrosis or gangrene (death of skin or other body tissues). Call your doctor immediately if you notice a purplish or darkened color to your skin, skin changes, ulcers, or an unusual problem in any area of your skin or body, or if you have a severe pain that occurs suddenly, or color or temperature change in any area of your body. Call your doctor immediately if your toes become painful or become purple or dark in color. You may need medical care right away to prevent amputation (removal) of your affected body part.Warfarin may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

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Warfarin comes as a tablet to take by mouth. It is usually taken once a day with or without food. Take warfarin at around the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take warfarin ex..
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