Aspirin
From SNPedia
Aspirin is a generic drug used for many purposes: reducing fever, as an anti-inflammatory, to relieve pain, and as a anti-platelet (anti-clotting) agent.Wikipedia
SNPs may influence how well aspirin works in these roles, as well as the degree to which side-effects (primarily ulcers) are experienced. SNPs reported to be involved with aspirin use to date include: