Final answer:
The nurse should discuss the intervention of changing position slowly when going from a lying to sitting position with the male client diagnosed with essential hypertension and prescribed an alpha-adrenergic blocker.
Step-by-step explanation:
The nurse should discuss the intervention of changing position slowly when going from a lying to sitting position with the male client diagnosed with essential hypertension and prescribed an alpha-adrenergic blocker. Alpha-adrenergic blockers can cause orthostatic hypotension, which is a drop in blood pressure when changing positions. Changing position slowly can help prevent dizziness or fainting due to a sudden drop in blood pressure.