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Clopidogrel (Plavix)

P2Y12 ADP-receptor antagonist / antiplatelet

Mechanism of action

Irreversibly inhibits the P2Y12 ADP receptor on platelets, blocking ADP-mediated platelet activation and aggregation for the platelet's lifespan (~7–10 days). Used for secondary prevention after MI/stroke/PAD and for dual antiplatelet therapy (DAPT) with aspirin after stent placement.

Adverse effects

Life-threatening / NCLEX-tested

  • Major bleeding — GI bleed, intracranial hemorrhage
  • Thrombotic thrombocytopenic purpura (TTP) — rare but life-threatening; pentad of fever, neuro changes, AKI, anemia, thrombocytopenia
  • Severe thrombocytopenia
  • Stent thrombosis if discontinued early after PCI
  • Hepatotoxicity (rare)

Side effects

Common — what to teach

  • Easy bruising
  • Minor bleeding (gums, nosebleeds)
  • Diarrhea
  • Rash
  • Headache
  • Dyspepsia

Food & drug interactions

Clopidogrel is a prodrug activated by CYP2C19 — strong CYP2C19 inhibitors (omeprazole, esomeprazole) reduce activation and antiplatelet effect; pantoprazole is preferred when a PPI is needed. Bleeding risk multiplies with NSAIDs, aspirin, anticoagulants, SSRIs. Genetic CYP2C19 poor-metabolizers may have reduced response.

Nursing implications

Assessment, monitoring, patient teaching

  • Teach: NEVER stop early after coronary stent placement without explicit cardiology direction — stent thrombosis risk is catastrophic
  • If a PPI is required, recommend pantoprazole over omeprazole/esomeprazole
  • Stop 5–7 days before elective surgery (irreversible inhibition — must wait for new platelets)
  • Counsel about black/tarry stools, severe headache, unusual bruising, fever or neurologic changes (TTP signal)
  • Take at the same time daily; with or without food
  • Reinforce DAPT duration as prescribed (typically 6–12+ months after drug-eluting stent)

When to hold / contraindications

  • Active major bleeding
  • Pre-surgical hold per protocol (typically 5–7 days)
  • Suspected TTP (fever + neuro + AKI + low platelets) — discontinue immediately
  • Severe hepatic impairment
  • Recent intracranial hemorrhage

Memory anchor

"Plavix protects platinum stents — never stop early." Irreversible like aspirin (stop 5–7 days pre-op). Avoid omeprazole; choose pantoprazole.

Reminder: Drug cards are study aids, not clinical guidance. Always cross-check doses, holds, and contraindications with your facility's formulary and your clinical instructors before patient care.

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