A 70-year-old African-American male came to your office for refills on his current medications. He works as a economics professor emeritus at the local university. He takes sertraline 100 mg daily for depression, trazodone 50 mg daily for insomnia, alprazolam 1 mg for anxiety, hydrochlorothiazide 25 mg and metoprolol 100 mg for hypertension, and gabapentin 100 mg for neuropathy. As you assess his risk of falls, which of the following is the most dangerous risk factor for falls in this individual?
