Clopidogrel Side Effects

Medically reviewed by Drugs.com. Last updated on Dec 11, 2024.

Applies to clopidogrel: oral tablet.

Precautions

It is very important that your doctor check your progress at regular visits. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to take it. Blood tests may be needed to check for unwanted effects.

Your doctor may do a genetic test before prescribing this medicine to determine if you have a deficiency in a liver enzyme called CYP2C19. This medicine may not work as well if you have this condition.

Tell all medical doctors, dentists, nurses, and pharmacists you go to that you are taking this medicine. Clopidogrel may increase the risk of serious bleeding during a surgery, other medical procedures (eg, coronary stent procedure), or some kinds of dental work. You may need to stop using this medicine at least 5 days before a surgery, medical procedure, or dental work. Do not stop taking your medicine without your doctor's permission.

While you are using this medicine, if you have any kind of bleeding, it may take longer than usual to stop, especially if you hurt yourself. Stay away from rough sports or other situations where you could be bruised, cut, or injured. Be careful when using sharp objects, including razors and fingernail clippers.

This medicine may increase your risk of bleeding or bruising. This risk may increase if you are also using other medicines, including blood thinners, other antiplatelet medicines, or NSAIDs. Check with your doctor right away if you notice any unusual bleeding or bruising, black, tarry stools, blood in the urine or stools, or pinpoint red spots on your skin. Avoid picking your nose. If you need to blow your nose, blow it gently.

Do not change your dose or Stop taking clopidogrel without checking first with your doctor.

Check with your doctor right away if you have a change in mental status, dark or bloody urine, difficulty with speaking, fever, pale color of the skin, pinpoint red spots on the skin, seizures, weakness, yellow eyes or skin. These maybe symptoms of a rare and serious condition called thrombotic thrombocytopenic purpura (TTP).

This medicine may cause allergic reactions, including angioedema, which can be life-threatening and require medical attention. Check with your doctor right away if you have large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, sex organs.

Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.

Serious side effects of clopidogrel

Along with its needed effects, clopidogrel may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking clopidogrel:

Other side effects of clopidogrel

Some side effects of clopidogrel may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

See also:

For healthcare professionals

Applies to clopidogrel: oral tablet.

General adverse events

The most commonly reported adverse effect was bleeding, including life threatening and fatal bleeding.^[Ref]

Hematologic

• Uncommon (0.1% to 1%): Fatal bleeding, eosinophilia, leucopenia, increased bleeding time, thrombocytopenia
• Rare (0.01% to 0.1%): Neutropenia
• Very rare (less than 0.01%): Decreased platelet count
• Postmarketing reports: Serious cases of bleeding (mainly skin), hemarthrosis, hematoma, hemorrhage of operative wound, fatal hemorrhage (intracranial, gastrointestinal, and retroperitoneal), thrombotic thrombocytopenic purpura (TTP), acquired hemophilia A, aplastic anemia, pancytopenia, agranulocytosis, granulocytopenia, anemia^[Ref]

In the COMMIT study (n=45,852), the incidence of major non-cerebral or cerebral bleeding was 0.6% in clopidogrel plus aspirin treated patients, with 0.4% classified as major non-cerebral (0.2% fatal) and 0.2% as hemorrhagic stroke (0.2% fatal). Non-major noncerebral bleeding or any noncerebral bleeding occurred in 3.6% and 3.9% of patients receiving this drug plus aspirin, respectively. Major bleeds were defined as cerebral bleeds or non-cerebral bleeds thought to have caused death or that required transfusion.

In the CURE study (n=12,562), the incidence of fatal bleeding (0.2%) and intracranial hemorrhage (0.1%) was the same between clopidogrel with aspirin and placebo with aspirin groups.^[Ref]

Gastrointestinal

• Common (1% to 10%): Abdominal pain, gastrointestinal hemorrhage, dyspepsia, diarrhea, nausea, gastritis
• Uncommon (0.1% to 1%): Vomiting, flatulence, constipation, gastric, peptic, or duodenal ulcer
• Rare (0.01% to 0.1%): Retroperitoneal hemorrhage
• Postmarketing reports: Colitis (ulcerative or lymphocytic), pancreatitis, stomatitis^[Ref]

In the CAPRIE study (n=19,185), gastrointestinal hemorrhage occurred in 2% of patients taking clopidogrel compared to 2.7% taking aspirin. Bleeding requiring hospitalization occurred in 0.7% clopidogrel-treated and 1.1% aspirin-treated patients.^[Ref]

Hypersensitivity

• Postmarketing reports: Angioedema, anaphylactic reactions, cross reactive hypersensitivity among thienopyridines (e.g. ticlopidine, prasugrel), hypersensitivity reactions^[Ref]

Cardiovascular

• Common (1% to 10%): Chest pain, hypertension, angina pectoris, coronary artery disorder, peripheral ischemia
• Very rare (less than 0.01%): Hematoma
• Postmarketing reports: Hypotension, syncope, vasculitis^[Ref]

Nervous system

• Common (1% to 10%): Dizziness, headache
• Uncommon (0.1% to 1%): Paresthesia
• Rare (0.01% to 0.1%): Vertigo, intracranial hemorrhage
• Postmarketing reports: Taste disturbances, ageusia^[Ref]

Musculoskeletal

• Common (1% to 10%): Arthralgia, back pain
• Postmarketing reports: Arthritis, myalgia, musculoskeletal bleeding^[Ref]

Psychiatric

• Common (1% to 10%): Depression
• Postmarketing reports: Hallucinations, confusion^[Ref]

Respiratory

• Common (1% to 10%): Upper respiratory tract infection, dyspnea, rhinitis, coughing, bronchitis, epistaxis
• Postmarketing reports: Bronchospasm, interstitial pneumonitis, eosinophilic pneumonia, respiratory tract bleeding (hemoptysis, pulmonary hemorrhage)^[Ref]

Dermatologic

• Common (1% to 10%): Rash, purpura, pruritus, bruising
• Postmarketing reports: Maculopapular, erythematous, or exfoliative rash, urticaria, bullous dermatitis, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, acute generalized exanthematous pustulosis, drug-induced hypersensitivity syndrome, drug rash with eosinophilia and systemic symptoms (DRESS), eczema, lichen planus^[Ref]

In CAPRIE (n=19,185), 4.2% of patients receiving clopidogrel developed a rash compared to 3.5% in the aspirin group. In CURE (n=12,562), 1.3% treated with clopidogrel and aspirin compared to 1.1% placebo, as well as 0.7% of patients in CLARITY (n=3491) reported a rash. Drug discontinuation due to skin disorders in CAPRIE was 0.8% and in CURE 0.4% of patients.^[Ref]

Hepatic

• Postmarketing reports: Hepatitis (noninfectious), acute liver failure, abnormal liver function tests^[Ref]

Metabolic

• Common (1% to 10%): Hypercholesterolemia^[Ref]

Genitourinary

• Common (1% to 10%): Urinary tract infection
• Postmarketing reports: Hematuria^[Ref]

Ocular

• Postmarketing reports: Eye bleeds (conjunctival, ocular, retinal)^[Ref]

Other

• Common (1% to 10%): Accidental/inflicted injury, influenza-like symptoms, pain, fatigue, infection
• Postmarketing reports: Fever^[Ref]

Renal

• Uncommon (0.1% to 1%): Hematuria
• Postmarketing reports: Glomerulopathy, serum creatinine increase^[Ref]

Immunologic

• Postmarketing reports: Serum sickness, insulin autoimmune syndrome^[Ref]

Endocrine

• Postmarketing reports: Gynecomastia^[Ref]

Local

• Common (1% to 10%): Puncture site bleeding^[Ref]

Frequently asked questions

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Further information

Clopidogrel side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

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