Among them, the cytochrome P450-2C9 gene (CYP2C9), which encodes the CYP2C9 enzyme, is amply expressed and related to the metabolic rate of almost 15% of medications, including xenobiotics, such as warfarin—an anticoagulant drug commonly prescribed for the treatment and/or prevention of cardiovascular diseases [6,7]. The gene discussed is CYP2C9; the disease is cardiovascular disorder.