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This medication is used to help prevent swelling and painful attacks caused by a certain inherited disease (hereditary angioedema-HAE). Most people with this disease have too little of a certain substance produced by your body (C1-esterase inhibitor). Some people with this disease have normal amounts of the substance, but it doesn't work right. Anxiety, stress, illness, or surgery may trigger attacks in some people. Symptoms such as rapid swelling of the hands, feet, limbs, face, tongue, or throat can occur. Swelling of the belly may cause symptoms such as severe pain, nausea, vomiting, or diarrhea. This medication works by increasing the amount of C1-esterase inhibitor in your body. This medication should not be used to treat sudden swelling attacks caused by HAE. Ask your doctor ahead of time what to do if you have a sudden attack.