 <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]  doctor may direct you to start using this medication before or after surgery and continue for several days. Follow your doctor's directions closely. Use this medication regularly to get the most benefit from it. To help you remember, use it at the same time(s) each day.The side effects of Fragmin Subcutaneous: See also Warning section. Irritation, bruising, and pain at the injection site may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. This medication can cause bleeding if its effect on your blood clotting proteins is too much. Tell your doctor right away if you have any serious signs of bleeding, including: unusual pain/swelling/discomfort, unusual or prolonged bleeding, unusual or easy bruising, dark urine, black stools, severe headache, confusion, vision changes, unusual dizziness, fainting, seizures, weakness, numbness. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: </s>