A nurse is caring for a client with a new order for acetaminophen.
What of the following options is a therapeutic use of this medication?

Choice A rationale

Diphenhydramine is an antihistamine used to relieve allergy symptoms.

Choice B rationale

Codeine is a narcotic pain reliever and cough suppressant classified as a Schedule V controlled substance when combined with other antitussive medications.

Choice C rationale

Benzonatate is a non-narcotic cough suppressant that numbs the throat and lungs.

Choice D rationale

Guaifenesin is an expectorant and not a controlled substance.

Choice A rationale: Furosemide is a loop diuretic used to reduce fluid overload in CHF patients. However, it can exacerbate electrolyte imbalances, particularly hypokalemia. Since the client is already experiencing muscle spasms and has low calcium levels, additional diuretic therapy could worsen these symptoms.

Choice B rationale: Metoprolol is a beta-blocker used to manage hypertension and heart rate in CHF patients. While beneficial for blood pressure control, it does not address the immediate issue of muscle spasms and constipation the client is experiencing.

Choice C rationale: Potassium chloride is indicated to address potential hypokalemia, which may be causing the client's muscle spasms. CHF patients on diuretics often experience low potassium levels, so supplementation is crucial to prevent complications and alleviate symptoms.

Choice D rationale: Acetaminophen is an analgesic and antipyretic, useful for pain and fever management. However, it does not address the client's reported muscle spasms, which are likely related to electrolyte imbalances.