MSFinals-5302

During an out of hours shift, you are called to see an 80-year-old man who has developed acute urinary retention on a background of 3 years of urinary hesitancy and poor stream. He has a history of ischaemic heart disease, hypertension and he tells you that his usual GP has recently started him on a new medication for neuropathic pain. Which of the following drugs is most likely to have precipitated the urinary retention?