 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.The uses of Arixtra Subcutaneous: Fondaparinux is used to treat serious blood clots in the legs and/or lungs. It is usually used with another "blood thinner" medication (warfarin). If untreated, blood clots can travel to the lungs, heart, or brain, causing serious (possibly fatal) breathing problems, heart attack, or stroke. This drug may also be used to prevent blood clots after certain surgeries with an increased risk of blood clots (such as hip fracture, abdominal, knee/hip replacement).Fondaparinux is known as a "blood thinner" (anticoagulant). It is a drug similar to heparin that works by blocking certain natural substances in the blood that cause clotting. How to use Arixtra Syringe Read the Patient Information Leaflet if available from your pharmacist before you start using fondaparinux and each time you get a refill. If you have any questions, ask your doctor or pharmacist. This medication is given by injection under the skin of the stomach/abdomen as directed by your doctor, usually once daily. Do not inject </s>