MOA of clopidogrel

Q: Clopidogrel (and other platelet P2Y12 receptor blockers) causes gastrointestinal bleed (GIB) due to its ulcerogenic characteristic.

A) True

B) False

Answer: B

Aspirin (ASA) and other nonsteroidal antiinflammatory drugs (NSAIDs) are directly ulcerogenic, but Platelet P2Y12 receptor blockers are not. They actually impair ulcer healing! This is the reason some experts believe in "GI-bleeders" only monotherapy with Platelet P2Y12 receptor blockers can be used.

In GI ulceration (caused by ASA, NSAIDs, or other causes), platelet aggregation leads to the release of platelet-derived growth factors, such as vascular endothelial growth factor (VEGF), which promote angiogenesis and endothelial cell proliferation, processes required for ulcer healing. Platelet P2Y12 receptor blockers prevent this healing.

#pharmacology

#cardiology

References:

1. Cryer B. Reducing the risks of gastrointestinal bleeding with antiplatelet therapies. N Engl J Med 2005; 352:287.

2. Ma L, Elliott SN, Cirino G, et al. Platelets modulate gastric ulcer healing: role of endostatin and vascular endothelial growth factor release. Proc Natl Acad Sci U S A 2001; 98:6470.

3. Waqas SA, Imran Z, Bilal AR, Ahmed S, Gaba H, Chew NWS, Greene SJ, Khan MS. Efficacy of clopidogrel monotherapy versus aspirin monotherapy after percutaneous coronary intervention. J Thromb Thrombolysis. 2025 Oct 10. doi: 10.1007/s11239-025-03185-0. Epub ahead of print. PMID: 41071255.