mrcem2-2187

A 68 year old female visits the emergency department with complaints of lower abdominal pain and a strong urge to urinate but an inability to do so. Upon examination, the patient’s bladder is easily palpable and a diagnosis of acute urinary retention is made. To determine if any medications may be contributing to the condition, you inquire about the patient’s drug history. Which of the following drug classes is NOT known to cause urinary retention?