| Medication | Availability | Dosing | Precautions |
| C1 inhibitor concentrate (plasma derived) (Berinert, Cinryze) | Widely available. In the United States, Cinryze is not approved for acute treatment but is effective. In Europe, Cinryze is approved for children. Despite the differences in product labeling, both products are effective for acute treatment of attacks. | Berinert ... |