Dyspnea And Skin Discoloration In A Transplant Patient — What’s The Cause?

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CaffeinatedSquirrel

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What medication is associated with this patient’s presentation?

A 41-year-old male patient presents to the emergency department with dyspnea, headache, vomiting, and weakness. He had a kidney transplant nine years ago, and has been on a stable anti-rejection regimen. He has allergies to ciprofloxacin and trimethoprim-sulfamethoxazole. Physical examination reveals gray-blue discoloration of the nose, fingers, and toes. A chest X-ray and ECG are both unremarkable. Arterial blood gas analysis demonstrates a pH of 7.5, Po2 of 99 mmHg, Pco2 of 18 mmHg, bicarbonate level of 20.8 mmol/L, and oxygen saturation of 99%. Which of the following medications is associated with this patient’s presentation?

A. Tacrolimus
B. Mycophenolate mofetil
C. Prednisone
D. Dapsone

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