This is a 3D video demonstrating the mechanism of action of tolvaptan. It is designed to be played on tablets and other mobile devices to be displayed as an e-detail for drug promotions by medical representatives. Tolvaptan is a selective vasopressin V2-receptor antagonist with an affinity for the V2-receptor that is 1.8 times that of native arginine vasopressin (AVP).Tolvaptan plays an important part in circulatory and water home ostasis. It can induce a highly hypotonic diuresis without substantially affecting the excretion of electrolytes.