Ecallantide is used to help control pain and swelling associated with hereditary angioedema, an immune system disease that causes abdominal cramping as well as swelling of the face and throat. This medication contains C1 inhibitor. Taking it encourages the body to make for C1, which helps correct the immune system imbalance causing the disease.
This medication should only be administered by a doctor in a hospital so that doctors can monitor patients’ health after taking the medication. The medication sometimes causes anaphylaxis, a serious, life-threatening allergic reaction in which the patient experiences swelling all over his or her body and may have difficulty breathing.