A 75-year-old white male complains of a tremor

A 75-year-old white male complains of a tremor, which has been progressive over the past two years. The tremor interferes with writing, pouring liquids, and eating soup. He has no other medical problems. He abstains from alcohol and tobacco products.

Physical examination is remarkable for an action tremor of the upper extremities and a head tremor. No rigidity or gait disorder is noted.

Of the following agents, which one is most appropriate as initial drug therapy for this problem?

a) Alprazolam
b) Clonazepam
c) Metoprolol
d) Propranolol
e) Theophylline