Kalvista Pharmaceuticals Inc. is promising to “change the paradigm” in the treatment of hereditary angioedema, after announcing positive phase III data for its oral on-demand kallikrein inhibitor sebetralstat. Rather than waiting four to five hours to self-administer therapy, as is the case for approved injectable on-demand therapies, there was a median time to dosing of 10 minutes after the start of an attack in the ongoing open label extension trial and a median time to dosing of 41 minutes in the 136-patient placebo-controlled phase 3 trial.