An elderly patient on digoxin has creatinine clearance rising from 0.8 to 1.2; what should you do?

An elderly patient on digoxin has creatinine clearance rising from 0.8 to 1.2; what should you do?

• A. Increase digoxin dose.
• B. Lower digoxin dose.
• C. Stop digoxin.
• D. No change needed.

Answer: (B)

Digoxin is cleared mainly by the kidneys, so renal function directly affects its blood levels. In older adults, even small changes in creatinine clearance can lead to meaningful shifts in digoxin exposure because the drug has a narrow therapeutic window. When creatinine clearance rises from 0.8 to 1.2, the kidneys are clearing digoxin more efficiently, which tends to lower the drug’s serum concentration for a given dose. To maintain safe, effective levels and reduce the risk of toxicity in a patient who is elderly and has fluctuating renal function, you would lower the digoxin dose. After adjusting, it’s important to monitor digoxin levels and renal function and re-titrate as needed. Increasing the dose could raise the risk of toxicity if clearance changes again, stopping the drug isn’t indicated without toxicity, and leaving the dose unchanged ignores the change in renal clearance.

Digoxin is cleared mainly by the kidneys, so renal function directly affects its blood levels. In older adults, even small changes in creatinine clearance can lead to meaningful shifts in digoxin exposure because the drug has a narrow therapeutic window. When creatinine clearance rises from 0.8 to 1.2, the kidneys are clearing digoxin more efficiently, which tends to lower the drug’s serum concentration for a given dose. To maintain safe, effective levels and reduce the risk of toxicity in a patient who is elderly and has fluctuating renal function, you would lower the digoxin dose. After adjusting, it’s important to monitor digoxin levels and renal function and re-titrate as needed. Increasing the dose could raise the risk of toxicity if clearance changes again, stopping the drug isn’t indicated without toxicity, and leaving the dose unchanged ignores the change in renal clearance.