Final answer:
Orthostatic hypotension is an adverse effect of hydrochlorothiazide.
Step-by-step explanation:
The nurse should identify orthostatic hypotension as an adverse effect of hydrochlorothiazide. Orthostatic hypotension refers to a drop in blood pressure when changing positions, such as from sitting to standing. As a diuretic, hydrochlorothiazide can cause fluid depletion and lower blood pressure, leading to orthostatic hypotension.