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Review Question - QID 101874

QID 101874 (Type "101874" in App Search)
A 30-year-old woman is undergoing work up for progressive weakness. She reports that at the end of the work day, her "eyelids droop" and her "eyes cross," but in the morning she feels "ok." She reports that her legs feel heavy when she climbs the stairs of her house to go to sleep at night. As part of her work up, the physician has her hold her gaze toward the ceiling, and after a minute, her lids become ptotic. She is given an IV medication and her symptoms resolve, but return 10 minutes later. Which of the following medications was used in the diagnostic test performed for this patient?