 <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]  intravenous Read the Patient Information Leaflet and Instructions for Use if available from your pharmacist before you start using this medication and each time you get a refill. If you have any questions, ask your doctor or pharmacist. This medication is given by injection into a vein as directed by your doctor, usually every 3 or 4 days. The dosage is based on your medical condition and response to treatment. If you are giving this medication to yourself at home, learn all preparation and usage instructions from your health care professional. The solution is normally clear and colorless to slightly blue, depending on the brand. Before using, check this product visually for particles or discoloration. If either is present, do not use the liquid. Learn how to store and discard medical supplies safely. Use this medication regularly to get the most benefit from it. Tell your doctor if your condition does not improve or if it worsens.The side effects of C1 Esterase Inhibitor Intravenous: Headache may occur. Other side effects are uncommon. If you notice any unusual side effects, 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 </s>