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In renal impairment, the kidneys’ ability to eliminate drugs is reduced, so medications that rely on the kidneys for clearance can accumulate in the body. This accumulation raises the risk of toxicity and unwanted adverse effects, and the drug’s effect may be prolonged. Because of this, dosing often needs adjustment—either lowering the dose or extending the interval between doses—guided by renal function tests like creatinine clearance or estimated GFR. It’s also important to consider whether dialysis will remove a given drug, since some drugs are cleared by dialysis and others are not; timing around dialysis can influence drug levels and effectiveness.

Liver metabolism isn’t automatically increased in renal impairment, so assuming faster clearance from the liver isn’t accurate. Hydration status does matter because dehydration and reduced renal perfusion can further decrease clearance. And not all drugs are cleared by dialysis, so dialysis does not automatically eliminate all medications.