A 52 y/o male of your primary care clinic has been recently…

A 52 y/o male of your primary care clinic has been recently diagnosed with benign prostatic hyperplasia (BPH) and isolated systolic hypertension. You decide to prescribe the medication doxazosin 1 mg nightly at bedtime. Which of the following adverse effects will you educate him on prior to sending his prescription to the pharmacy?