Arixtra 2.5 mg/0.5 ml is an injectable anticoagulant medication containing Fondaparinux Sodium. It is provided in pre-filled syringes with each syringe containing 2.5 milligrams in 0.5 ml solution. The package contains 10 syringes. This medication is used to prevent venous thromboembolism (blood clots) after certain types of surgery like orthopedic procedures.