Von Willebrand disease (VWD) is the most common autosomally inherited bleeding disorder characterized by abnormal quantity or quality of von Willebrand factor (VWF). Type 1 VWD exhibits a mild to moderate reduction in functionally normal VWF; type 2 VWD involves the expression of functionally abnormal VWF (further subdivided into types 2A, 2B, 2M, and 2N); and type 3 VWD presents the virtually complete absence of VWF. Clinical symptoms of VWD include predominantly mild mucosal bleeding. Joint bleeding can occur in the most severe forms.
Drugs that treat von Willebrand disease