Final answer:
Hydrochlorothiazide, a thiazide diuretic, is likely the first medication the provider will prescribe for a client with hypertension unresponsive to lifestyle changes, due to its efficacy as a first-line treatment and favorable side effect profile.
Step-by-step explanation:
The nurse should expect the provider to prescribe a medication that is often considered first-line treatment for hypertension, particularly for a client who is unresponsive to lifestyle changes and has no other comorbidities. Among the options presented, Hydrochlorothiazide is the preferred initial medication to prescribe for such a patient. This medication is a thiazide diuretic, which works by inhibiting the reabsorption of sodium and chloride ions in the distal convoluted tubule of the kidneys, thus reducing blood volume and blood pressure. ACE inhibitors like Captopril are also first-line medications for hypertension, but thiazide diuretics are typically preferred as the initial therapy unless there are specific indications for an ACE inhibitor.
Beta blockers like Metoprolol and vasodilators like Hydralazine are other treatment options for hypertension but are usually not the first choice when beginning treatment in a patient without comorbidities. Beta blockers work by slowing the heart rate and reducing cardiac output, while Hydralazine directly relaxes vascular smooth muscle. However, for initial treatment, diuretics like Hydrochlorothiazide are favored because of their effectiveness and relatively favorable side effect profile.