Clopidogrel side effects: Difference between revisions

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Side effects


The following adverse events were observed and have been reported in patients using Clopidogrel.

Evaluation in Safety Trials

≥2.5%

1% to 2.5%

<1%

Postmarketing Experience








Evaluation in Safety Trials

Plavix has been evaluated for safety in more than 17,500 patients, including over 9,000 patients treated for 1 year or more. The overall tolerability of Plavix in CAPRIE was similar to that of aspirin regardless of age, gender and race, with an approximately equal incidence (13%) of patients withdrawing from treatment because of adverse reactions. The clinically important adverse events observed in CAPRIE and CURE are discussed below.

  • Hemorrhagic:

In CAPRIE patients receiving Clopidogrel, gastrointestinal hemorrhage occurred at a rate of 2.0%, and required hospitalization in 0.7%. In patients receiving aspirin, the corresponding rates were 2.7% and 1.1%, respectively. The incidence of intracranial hemorrhage was 0.4% for Clopidogrel compared to 0.5% for aspirin.

In CURE, Clopidogrel use with aspirin was associated with an increase in bleeding compared to placebo with aspirin (see Table 3). There was an excess in major bleeding in patients receiving Clopidogrel plus aspirin compared with placebo plus aspirin, primarily gastrointestinal and at puncture sites. The incidence of intracranial hemorrhage (0.1%), and fatal bleeding (0.2%), were the same in both groups.

The overall incidence of bleeding is described in Table 3 for patients receiving both Plavix and aspirin in CURE,

Ninety-two percent (92%) of the patients in the CURE study received heparin/LMWH, and the rate of bleeding in these patients was similar to the overall results.

There was no excess in major bleeds within seven days after coronary bypass graft surgery in patients who stopped therapy more than five days prior to surgery (event rate 4.4% Plavix + aspirin; 5.3% placebo + aspirin). In patients who remained on therapy within five days of bypass graft surgery, the event rate was 9.6% for Plavix + aspirin, and 6.3% for placebo + aspirin.

  • Neutropenia/agranulocytosis:

Ticlopidine, a drug chemically similar to Clopidogrel, is associated with a 0.8% rate of severe neutropenia (less than 450 neutrophils/µL). In CAPRIE severe neutropenia was observed in six patients, four on Plavix and two on aspirin. Two of the 9599 patients who received Plavix and none of the 9586 patients who received aspirin had neutrophil counts of zero. One of the four Plavix patients in CAPRIE was receiving cytotoxic chemotherapy, and another recovered and returned to the trial after only temporarily interrupting treatment with Plavix (clopidogrel bisulfate). In CURE, the numbers of patients with thrombocytopenia (19 Plavix + aspirin vs. 24 placebo + aspirin) or neutropenia (3 vs. 3) were similar.

Although the risk of myelotoxicity with Plavix (clopidogrel bisulfate) thus appears to be quite low, this possibility should be considered when a patient receiving Plavix demonstrates fever or other sign of infection.

  • Gastrointestinal:

Overall, the incidence of gastrointestinal events (e.g. abdominal pain, dyspepsia, gastritis and constipation) in patients receiving Plavix (clopidogrel bisulfate) was 27.1%, compared to 29.8% in those receiving aspirin in the CAPRIE trial. In the CURE trial the incidence of these gastrointestinal events for patients receiving Clopidogrel + aspirin was 11.7% compared to 12.5% for those receiving placebo + aspirin.

In the CAPRIE trial, the incidence of peptic, gastric or duodenal ulcers was 0.7% for Plavix (clopidogrel bisulfate) and 1.2% for aspirin. In the CURE trial the incidence of peptic, gastric or duodenal ulcers was 0.4% for Plavix + aspirin and 0.3% for placebo + aspirin.

Cases of diarrhea were reported in the CAPRIE trial in 4.5% of patients in the Plavix group compared to 3.4% in the aspirin group. However, these were rarely severe (Plavix=0.2% and aspirin=0.1%). In the CURE trial, the incidence of diarrhea for patients receiving Plavix + aspirin was 2.1% compared to 2.2% for those receiving placebo + aspirin.

In the CAPRIE trial, the incidence of patients withdrawing from treatment because of gastrointestinal adverse reactions was 3.2% for Plavix and 4.0% for aspirin. In the CURE trial, the incidence of patients withdrawing from treatment because of gastrointestinal adverse reactions was 0.9% for Plavix + aspirin compared with 0.8% for placebo + aspirin.

  • Rash and Other Skin Disorders:

In the CAPRIE trial, the incidence of skin and appendage disorders in patients receiving Plavix was 15.8% (0.7% serious); the corresponding rate in aspirin patients was 13.1% (0.5% serious). In the CURE trial the incidence of rash or other skin disorders in patients receiving Plavix + aspirin was 4.0% compared to 3.5% for those receiving placebo + aspirin.

In the CAPRIE trial, the overall incidence of patients withdrawing from treatment because of skin and appendage disorders adverse reactions was 1.5% for Plavix and 0.8% for aspirin. In the CURE trial, the incidence of patients withdrawing because of skin and appendage disorders adverse reactions was 0.7% for Plavix + aspirin compared with 0.3% for placebo + aspirin.

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≥2.5%

Adverse events occurring in ≥2.5% of patients on Plavix in the CAPRIE controlled clinical trial are shown below regardless of relationship to Plavix. The median duration of therapy was 20 months, with a maximum of 3 years.

Incidence of discontinuation, regardless of relationship to therapy, is shown in parentheses.

Adverse events occurring in ≥2.0% of patients on Plavix in the CURE controlled clinical trial are shown below regardless of relationship to Plavix.

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1% to 2.5%

Other adverse experiences of potential importance occurring in 1% to 2.5% of patients receiving Plavix (clopidogrel bisulfate) in the CAPRIE or CURE controlled clinical trials are listed below regardless of relationship to Plavix. In general, the incidence of these events was similar to that in patients receiving aspirin (in CAPRIE) or placebo + aspirin (in CURE).

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<1%

Other potentially serious adverse events which may be of clinical interest but were rarely reported (<1%) in patients who received Plavix in the CAPRIE or CURE controlled clinical trials are listed below regardless of relationship to Plavix. In general, the incidence of these events was similar to that in patients receiving aspirin (in CAPRIE) or placebo + aspirin (in CURE).

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Postmarketing Experience

The following events have been reported spontaneously from worldwide postmarketing experience:

  • Body as a whole:
  • Central and Peripheral Nervous System disorders:
  • Hepato-biliary disorders:
  • Platelet, Bleeding and Clotting disorders:
  • Respiratory, thoracic and mediastinal disorders:
  • Skin and subcutaneous tissue disorders:
  • Renal and urinary disorders:
  • Vascular disorders:
  • Gastrointestinal disorders:
  • Musculoskeletal, connective tissue and bone disorders:
  • myalgia

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Adapted from the FDA Package Insert.

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