Dabigatran has a neutralizing effect on coagulation [9, 10], is less affected by CYP3A4 metabolism than other DOACs, and its coagulation effect can be predicted by test values such as activated partial thromboplastin time [11, 12], thereby rendering it safer for use in patients with multiple drugs; however, in this study, its prescription rate was less than 10%, possibly because it is the only indication for venous thrombosis. This evidence concerns the gene CYP3A4 and Venous thrombosis.