<prompt> ICATIBANT IS A ?bradykinin B 1 antagonistbradykinin B 2 antagonistbradykinin B 3 antagonisthistamine receptor H3 antagonist  <response>: Icatibant, New Bradykinin-Receptor Antagonist, in HAE Icatibant Firazyr, Shire synthetic selective decapeptide bradykinin B2 receptor competitive antagonist contains 5 non-natural amino acids to enhance resistance to peptidases Icatibant administered sc injection as single 30 mg peak concentration within 30 minutes, ref : kd tripathi 8th ed 