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Warfarin Side Effects

Report Warfarin Side Effects

If you experienced any harmful or unwanted effects of Warfarin, please share your experience. This could help to raise awareness about Warfarin side effects, identify uknown risks and inform health professionals and patients taking Warfarin.

Examples: headache, dizziness


The most commonly reported Warfarin side effects are:
Tiredness (222 reports)
Joint (110 reports)
Muscle (68 reports)
Anxiety (55 reports)
Bone Pain (50 reports)
Lethargy (47 reports)
Depression (44 reports)
Headache (16 reports)
Bruising (14 reports)

If you have experienced a side effect listed above, you can check a box to report it.


To view a complete list of submitted side effects, please follow the link Warfarin side effects . You can also compare Warfarin side effects or view FDA reports.

Warfarin Side Effects reported to FDA

The following Warfarin reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
The FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.


The appearance of Warfarin on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has identified a causal relationship between the drug and the listed risk.

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Post Procedural Haemorrhage, Epistaxis
on Feb 27, 2014 Female from US , 82 years of age, weighting 170.4 lb, was diagnosed with and was treated with Warfarin 7.5 Mg Jantoven. Directly after, patient experienced the unwanted or unexpected Warfarin side effects: post procedural haemorrhage, epistaxis. Warfarin 7.5 Mg Jantoven dosage: 7.5 Mg ( One Tablet) Qd Oral. Patient was hospitalized.

Upper Gastrointestinal Haemorrhage, International Normalised Ratio Increased, Haemoptysis
Patient was taking Warfarin 7 Mg. Patient felt the following Warfarin side effects: upper gastrointestinal haemorrhage, international normalised ratio increased, haemoptysis on Feb 27, 2014 from US Additional patient health information: Male , 84 years of age, . Warfarin 7 Mg dosage: N/A.
Multiple prescriptions taken:
  • Aspirin Ec
  • Cholecalciferol
  • Esomeprazole
  • Glipizide
  • Hydroxyurea
  • Insulin Aspart Scale
  • Lisinopril
  • Metoprolol Tartrate
Patient was hospitalized.

Abdominal Pain Upper, Diarrhoea, Dizziness
Adverse event was reported on Feb 27, 2014 by a Female taking Warfarin (Dosage: N/A) was diagnosed with and. Location: US , 78 years of age, weighting 210.0 lb, After Warfarin was administered, patient encountered several Warfarin side effects: abdominal pain upper, diarrhoea, dizziness.
Multiple concurrent drugs taken:
  • Betoptic
  • Azopt
  • Travatan
  • Pace Maker
  • Inhaler For Asmatha
  • Amlodipine
  • Metoprolol
  • Aspirin
Patient was hospitalized.

Intestinal Haematoma, Upper Gastrointestinal Haemorrhage, Overdose, Blood Urea Increased, Blood Creatinine Increased, Hypotension
on Feb 27, 2014 Male from TR , 67 years of age, was diagnosed with and was treated with Warfarin Sodium. Directly after, patient experienced the unwanted or unexpected Warfarin side effects: intestinal haematoma, upper gastrointestinal haemorrhage, overdose, blood urea increased, blood creatinine increased, hypotension. Warfarin Sodium dosage: N/A. Patient was hospitalized.


International Normalised Ratio Increased
on Feb 27, 2014 Female from GB , 89 years of age, was treated with Warfarin. Patient felt the following Warfarin side effects: international normalised ratio increased. Warfarin dosage: Variable.
Multiple prescriptions taken:
  • Nitrofurantoin
  • Ramipril (In The Morning. Been On Long Term.)
  • Ibuprofen (Topically Three Times Daily / As Required.)
  • Bisoprolol (In The Morning. Been On Long Term.)
  • Atorvastatin (In The Evening. Been On Long Term.)
  • Amlodipine (In The Morning. Been On Long Term.)
Patient was hospitalized.

Ulcer, Skin Necrosis
Patient was taking Warfarin. After Warfarin was administered, patient encountered several Warfarin side effects: ulcer, skin necrosis on Mar 17, 2014 from FR Additional patient health information: Female , 70 years of age, was diagnosed with and. Warfarin dosage: N/A.

Rash, Skin Exfoliation
Adverse event was reported on Feb 26, 2014 by a Male taking Warfarin (Dosage: 2.5 Or 5 Mg Ud Po) was diagnosed with and. Location: US , 93 years of age, weighting 144.2 lb, Directly after, patient experienced the unwanted or unexpected Warfarin side effects: rash, skin exfoliation. Patient was hospitalized.

Confusional State, Swelling, Contusion, Dysphagia, Aphasia
on Feb 24, 2014 Male from US , 68 years of age, weighting 253.5 lb, was diagnosed with and was treated with Warfarin. Patient felt the following Warfarin side effects: confusional state, swelling, contusion, dysphagia, aphasia. Warfarin dosage: Mg Pm Po. Patient was hospitalized.

Gastrointestinal Haemorrhage, Balance Disorder, Haemoglobin Decreased
on Feb 24, 2014 Male from US , 91 years of age, weighting 206.6 lb, was diagnosed with and was treated with Warfarin. After Warfarin was administered, patient encountered several Warfarin side effects: gastrointestinal haemorrhage, balance disorder, haemoglobin decreased. Warfarin dosage: Mg Pm Po. Patient was hospitalized.

International Normalised Ratio Increased
Patient was taking Warfarin (warfarin). Directly after, patient experienced the unwanted or unexpected Warfarin side effects: international normalised ratio increased on Feb 21, 2014 from US Additional patient health information: Male , 65 years of age, . Warfarin (warfarin) dosage: N/A.
Associated medications used: Patient was hospitalized.

No Therapeutic Response
Adverse event was reported on Feb 24, 2014 by a Female taking Warfarin (Dosage: N/A) was diagnosed with and. Location: US , 32 years of age, Patient felt the following Warfarin side effects: no therapeutic response.

Intestinal Haematoma, Intestinal Obstruction
on Feb 25, 2014 Male from TR , 48 years of age, was treated with Warfarin Sodium. After Warfarin was administered, patient encountered several Warfarin side effects: intestinal haematoma, intestinal obstruction. Warfarin Sodium dosage: N/A. Patient was hospitalized.

Haemoglobin Decreased, Haematocrit Decreased, International Normalised Ratio Increased
on Feb 21, 2014 Male from US , 78 years of age, weighting 170.4 lb, was treated with Warfarin. Directly after, patient experienced the unwanted or unexpected Warfarin side effects: haemoglobin decreased, haematocrit decreased, international normalised ratio increased. Warfarin dosage: N/A. Patient was hospitalized.

Gastrointestinal Haemorrhage, Gastric Haemorrhage, Rectal Haemorrhage, Haemoptysis
Patient was taking Warfarin. Patient felt the following Warfarin side effects: gastrointestinal haemorrhage, gastric haemorrhage, rectal haemorrhage, haemoptysis on Feb 21, 2014 from US Additional patient health information: Male , 67 years of age, weighting 295.4 lb, was diagnosed with and. Warfarin dosage: N/A.
Multiple prescriptions taken: Patient was hospitalized.

Anaemia, International Normalised Ratio Abnormal
Adverse event was reported on Feb 21, 2014 by a Male taking Warfarin (Dosage: N/A) was diagnosed with and. Location: US , 73 years of age, weighting 160.9 lb, After Warfarin was administered, patient encountered several Warfarin side effects: anaemia, international normalised ratio abnormal. Patient was hospitalized.

Haemorrhage, International Normalised Ratio Abnormal
on Feb 21, 2014 Female from US , 31 years of age, weighting 165.6 lb, was diagnosed with and was treated with Warfarin. Directly after, patient experienced the unwanted or unexpected Warfarin side effects: haemorrhage, international normalised ratio abnormal. Warfarin dosage: N/A. Patient was hospitalized.

Dyspnoea, International Normalised Ratio Increased, Anaemia, Refusal Of Treatment By Patient
on Feb 21, 2014 Male from US , 81 years of age, weighting 172.4 lb, was diagnosed with and was treated with Warfarin. Patient felt the following Warfarin side effects: dyspnoea, international normalised ratio increased, anaemia, refusal of treatment by patient. Warfarin dosage: N/A. Patient was hospitalized.

Gingival Bleeding
Patient was taking Warfarin. After Warfarin was administered, patient encountered several Warfarin side effects: gingival bleeding on Feb 21, 2014 from US Additional patient health information: Male , 75 years of age, weighting 245.2 lb, was diagnosed with and. Warfarin dosage: N/A.
Multiple concurrent drugs taken: Patient was hospitalized.

International Normalised Ratio Increased
Adverse event was reported on Feb 24, 2014 by a Female taking Warfarin (Dosage: N/A) was diagnosed with and. Location: GB , 82 years of age, Directly after, patient experienced the unwanted or unexpected Warfarin side effects: international normalised ratio increased.
Associated medications used:
  • Prednisolone (30 Milligram Daily;)
  • Clarithromycin
  • Amoxicillin (1500 Milligram Daily;)
  • Atorvastatin (40 Milligram Daily; When Clarithromycin Was Given Atorvastatin Was Temporarily Stopped)
  • Prochlorperazine Maleate (15 Milligram Daily;)
  • Metformin Hydrochloride (500 Milligram Daily;)
  • Quinine Sulfate (Use As Directed)
  • Co-amilofruse (1 Dosage Forms Daily; 10/80. Each Morning.)
Patient was hospitalized.

International Normalised Ratio Increased, Vomiting, Contusion
on Feb 24, 2014 Female from US , 32 years of age, was diagnosed with and was treated with Warfarin. Patient felt the following Warfarin side effects: international normalised ratio increased, vomiting, contusion. Warfarin dosage: 35 Mg/week (5 Mg/day); Then 37.5 Mg/week.

Upper Gastrointestinal Haemorrhage, Dizziness, Hypotension, Melaena
on Feb 23, 2014 Female from GB , 74 years of age, weighting 116.0 lb, was diagnosed with and was treated with Warfarin. After Warfarin was administered, patient encountered several Warfarin side effects: upper gastrointestinal haemorrhage, dizziness, hypotension, melaena. Warfarin dosage: Variable, Target Inr 2-3.
Multiple concurrent drugs taken:
  • Lisinopril
  • Simvastatin
  • Digoxin
  • Furosemide
  • Diltiazem
  • Amiloride
Patient was hospitalized.

International Normalised Ratio Increased
Patient was taking Warfarin. Directly after, patient experienced the unwanted or unexpected Warfarin side effects: international normalised ratio increased on Feb 21, 2014 from GB Additional patient health information: Female , 82 years of age, . Warfarin dosage: 3 Mg, Unk.
Associated medications used:
  • Amoxicillin (500 Mg, Tid)
  • Prednisolone (30 Mg, Od)
  • Clarithromycin (Unk)
  • Allopurinol (300 Mg, Od)
  • Amitriptyline Hydrochloride (25 Mg, Od)
  • Atorvastatin (40 Mg, Od)
  • Bricanyl (1 Df, Prn)
  • Cetraben Emollient Cream
Patient was hospitalized.

Hypotension, Melaena, Dizziness, Upper Gastrointestinal Haemorrhage
Adverse event was reported on Feb 21, 2014 by a Female taking Warfarin (Dosage: Unk) was diagnosed with and. Location: GB , 74 years of age, weighting 116.0 lb, Patient felt the following Warfarin side effects: hypotension, melaena, dizziness, upper gastrointestinal haemorrhage. Patient was hospitalized.

Small Intestinal Haemorrhage
on Feb 20, 2014 Male from US , 66 years of age, weighting 220.0 lb, was treated with Warfarin. After Warfarin was administered, patient encountered several Warfarin side effects: small intestinal haemorrhage. Warfarin dosage: 2pills. Patient was hospitalized.

Haemorrhage Intracranial, Renal Failure Acute, Acidosis, Cardio-respiratory Arrest
on Feb 21, 2014 Male from US , 71 years of age, was diagnosed with and was treated with Warfarin Sodium. Directly after, patient experienced the unwanted or unexpected Warfarin side effects: haemorrhage intracranial, renal failure acute, acidosis, cardio-respiratory arrest. Warfarin Sodium dosage: N/A.
Associated medications used:
  • Lovenox
  • Morphine Sulfate
  • Morphine Sulfate
  • Vitamin B Complex
  • Colace
  • Lorazepam
  • Ondansetron
  • Oxycodone
Patient was hospitalized.

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Record and Track Your Side Effects

It is very important to keep track of all side effects and discuss them with your doctor. If you think you may have a medical emergency, call your doctor or 911 immediately.

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Most drugs have a large list of nonsevere or mild adverse effects which do not rule out continued usage. These effects depend on individual sensitivity, and can include nausea, dizziness, diarrhea, malaise, vomiting, headache, dermatitis, dry mouth, etc. Check commonly reported side effects . These can be considered a form of pseudo-allergic reaction, as not all users experience these effects; many users experience none at all.

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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Before Taking Warfarin

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Discuss Warfarin Side Effects

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JustAnswer.com

Safety Alerts, Active Ingredients, Usage Information

Alternative WARFARIN Names:COUMADIN JANTOVEN

Active Ingredient: WARFARIN

More About Warfarin

Side Effects reported to FDA: 7783

Warfarin safety alerts: 2014 2013 2011 2007 2006

Reported deaths: 600

Reported hospitalizations: 3723

Coumadin (warfarin sodium) Crystalline 5 mg Tablets: Recall - Tablets May Have Higher than Expected Potency

[Posted 05/03/2011]

AUDIENCE: Cardiology, Pharmacy, Patients

ISSUE: Bristol-Myers Squibb initiated a voluntary recall of one lot of 1,000-count bottles of Coumadin (warfarin sodium) Crystalline 5 mg tablets. Company testing of tablets from a returned bottle found a tablet to be higher in potency than expected. The lot number affected in the U.S. is 9H49374A with an expiry date of September 30, 2012. A decrease of active ingredient may increase the risk of clots which could lead to heart attack or stroke, and if there is too much active ingredient, there is an increased risk of bleeding.

BACKGROUND: Coumadin is prescribed to treat or prevent blood clots.

RECOMMENDATION: Patients who may have 5 mg tablets should not interrupt their therapy but should seek advice from their pharmacist to see if they have tablets originating from the affected lot and if so, should consult their physician for appropriate medical advice.


Healthcare professionals and patients are encouraged to report adverse events or side effects related to the use of these products to the FDA's MedWatch Safety Information and Adverse Event Reporting Program:

  • Complete and submit the report Online: www.fda.gov/MedWatch/report.htm
  • Download form or call 1-800-332-1088 to request a reporting form, then complete and return to the address on the pre-addressed form, or submit by fax to 1-800-FDA-0178


[05/02/2011 - Press Release - Bristol-Myers Squibb]

Latest Warfarin clinical trials