All of the following can be used for thromboprophylaxis, except

Heparin, aspirin (antiplatelet), and warfarin are all commonly used for thromboprophylaxis in various clinical settings. Antithrombin-III concentrate is primarily used to treat congenital antithrombin deficiency, not for routine thromboprophylaxis. Heparin works by potentiating antithrombin-III, but giving antithrombin-III itself is not standard prophylaxis.