Which knowledge is necessary to teach patients with chronic kidney disease about medications?

• A. The illness may cause accumulation of the drug resulting in toxicity.
• B. The liver metabolism is the sole determinant.
• C. Renal disease speeds drug clearance.
• D. Kidneys do not influence drug toxicity.

Answer: (A)

In patients with chronic kidney disease, the kidneys’ reduced ability to eliminate drugs and their metabolites means medications can accumulate in the body over time. That buildup raises the risk of toxicity, even if the dose hasn’t changed. So the important thing to teach is that kidney disease can cause drug accumulation and potential toxicity, and that doses or dosing intervals may need adjustment based on kidney function. This idea helps patients understand why their healthcare provider may modify their medications or require monitoring tests.

Think about the other statements this way: liver metabolism is not the only factor that determines how a drug behaves in the body—many drugs are cleared by the kidneys, and factors like protein binding and the drug’s active metabolites matter too. Renal disease does not speed up clearance; it slows it, leading to longer-lasting drug levels. And kidneys do influence drug toxicity, since impaired clearance can cause harmful buildup.