Why is renal function monitoring important for patients on bisphosphonates?

• A. They are hepatically cleared; monitor liver enzymes
• B. Bisphosphonates are renally cleared and can cause renal toxicity; dosing may need adjustment or avoidance in CKD; monitor creatinine clearance
• C. They have no renal concerns; monitoring not needed
• D. They improve kidney function

Answer: (B)

Renal safety is the focus here because bisphosphonates are cleared by the kidneys and can cause renal toxicity. When kidney function is reduced, the drug can accumulate, increasing the risk of nephrotoxic effects. That’s why dosing may need to be adjusted or the drug avoided in chronic kidney disease, and why monitoring creatinine clearance or eGFR is essential. Start with a baseline renal assessment and periodically recheck as therapy continues to catch any early signs of kidney impact. For IV forms, ensure proper hydration and appropriate infusion rates to minimize risk, and be cautious with other nephrotoxic factors. In short, checking renal function guides safe use and dosing of bisphosphonates. The other statements aren’t correct because these drugs are not primarily cleared by the liver, there are real renal concerns with their use, and they do not improve kidney function.