In kidney failure, medication dosage is typically adjusted in which direction?

In kidney failure, medication dosage is typically adjusted in which direction?

• A. Increase dose
• B. No change
• C. Increase frequency
• D. Decrease dose

Answer: (D)

Renal function directly affects how quickly medicines are cleared from the body. In kidney failure, clearance is reduced, so the same amount of drug stays in the body longer and at higher levels. To avoid toxicity and keep drug exposure within the desired range, the dose is typically lowered (or the dosing interval is extended). That’s why decreasing the dose is the best choice here. Increasing the dose or increasing how often you give the drug would raise blood levels further and raise the risk of adverse effects, while not changing the dose ignores the slower elimination in kidney failure.

Renal function directly affects how quickly medicines are cleared from the body. In kidney failure, clearance is reduced, so the same amount of drug stays in the body longer and at higher levels. To avoid toxicity and keep drug exposure within the desired range, the dose is typically lowered (or the dosing interval is extended). That’s why decreasing the dose is the best choice here. Increasing the dose or increasing how often you give the drug would raise blood levels further and raise the risk of adverse effects, while not changing the dose ignores the slower elimination in kidney failure.