CAMBRIDGE, Mass.--(BUSINESS WIRE)--Dyax Corp. (NASDAQ: DYAX) announced today treatment of the first patient in a Phase 2 trial evaluating the efficacy and safety of ecallantide, a potent, selective, reversible inhibitor of plasma kallikrein, for acute treatment of angiotensin converting enzyme (ACE) inhibitor-induced angioedema. This form of angioedema, or rapid swelling of the dermis, mucosa or other tissues, most commonly occurs in the head, face and tongue, and can be severe or life threatening. Ecallantide is approved under the brand name KALBITOR® in the United States for the treatment of acute attacks of hereditary angioedema (HAE) in patients 16 years of age and older.