This antidote has been used in the treatment of refractory anaphylaxis?
Kelly KJ reported a case of a patient with refractory anaphylaxis without hypotension that received an infusion of methylene blue 1% at 1.5 mg/kg. Her dyspnea began to improve within 6 minutes of the methylene blue infusion and her only complaint at the end of the infusion was nausea. (Kelly KJ. Methylene blue for the treatment of refractory anaphylaxis without hypotension. Am J Em Med 2013; 31: 264.e3-264.e5. doi: 10.1016/j.ajem.2012.03.036)