Coumadin is the brand name for warfarin, an oral vitamin K antagonist anticoagulant. Cava e cakava: Prevents blood clot formation by inhibiting vitamin K–dependent clotting factors (II, VII, IX, X). Cava mo cakava: Requires regular blood tests (INR). Typical target INR is 2.0–3.0 (higher, e.g., 2.5–3.5, for some mechanical valves). Cava e vakavuna: Vitamin K (oral/IV) and prothrombin complex concentrate (PCC) for serious bleeding. Bleeding (major concern), skin necrosis (rare), teratogenic—avoid