A client has a new prescription for dextromethorphan (Robitussin). Which of the following is a therapeutic use for this medication?

Choice A rationale

Spironolactone is a potassium-sparing diuretic that acts on the collecting ducts and late distal tubules but not on the loop of Henle.

Choice B rationale

Hydrochlorothiazide is a thiazide diuretic that works on the distal convoluted tubule, not the loop of Henle.

Choice C rationale

Furosemide is a loop diuretic that acts on the ascending limb of the loop of Henle to inhibit sodium and chloride reabsorption, leading to increased urine output.

Choice D rationale

Mannitol is an osmotic diuretic that primarily acts on the proximal tubule and the descending limb of the loop of Henle.

Choice A rationale

Warfarin is an anticoagulant that is used to prevent venous thrombosis and thromboembolic events by inhibiting the synthesis of vitamin K-dependent clotting factors.

Choice B rationale

Warfarin is not used to prevent angina pectoris, which is typically managed with nitrates, beta-blockers, or calcium channel blockers.

Choice C rationale

Warfarin is not used to treat bradycardia, which is usually managed with medications like atropine or pacemaker implantation.

Choice D rationale

Warfarin is not used to treat hypertension. Antihypertensive medications such as ACE inhibitors, beta-blockers, or diuretics are used for this purpose.