A hemostatic composition which comprises at least one procoagulant metal ion, such as silver (I) or mercury (II), and at least one procoagulant biopolymer, such as collagen, thrombin, prothrombin, fibrin, fibrinogen, heparinase, Factor VIIa, Factor VIII, Factor IXa, Factor Xa, Factor XII, von Willebrand Factor, a selectin, a procoagulant venom, a plasminogen activator inhibitor, glycoprotein IIb-IIIa, a protease, or plasma. The composition in the form of a paste, dough, glue, liquid, lyophilized powder or foam, may be provided, for application to a wound. A hemostatic device is also described which comprises a hemostatic composition as described above. The device may be in the form of, for example, a plug, bandage, gauze, cloth, tampon, membrane or sponge. Methods are also provided for prophylaxis or treatment of bleeding at a site by application to the site of the composition or device as described.