A 79-year-old patient on digoxin for heart failure has serum digoxin levels within the therapeutic range of 0.8–2 ng/mL but develops nausea and visual disturbances. The consultant pharmacist should:
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A
Recognize that elderly patients may develop toxicity at lower serum levels and recommend dose reduction
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B
Reassure the care team because the level is within normal range
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C
Increase the digoxin dose to achieve better therapeutic effect
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D
Add a calcium channel blocker to enhance digoxin efficacy