A 60-year-old man is brought to the emergency department due to lower abdominal discomfort. In the ER he appears confused and disoriented. He didn't pass any urine for the past 24 hours. He has a medical history of benign prostatic hyperplasia, hypertension, hyperlipidemia, and type 2 diabetes mellitus complicated by neuropathy. He takes multiple medications but he does not know his current medications. A urinary catheter is placed and immediately drains 1000 mL of urine. Which of the following medications most likely has contributed to this patient's current condition?

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Eductional Objective: Tricyclic antidepressants have strong anticholinergic properties. Potential side effects include confusion, constipation, and urinary retention. These medications should be used with caution in elderly patients.

A 60-Year-Old Man Is Brought to the Emergency Department Due