Which factor commonly requires dosage adjustment?

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Understanding how organ function affects drug elimination helps explain why this factor often drives dose changes. The kidneys are the main route for clearing many drugs from the body. When kidney function is reduced, drug clearance drops, the drug stays in the system longer, and levels can accumulate, increasing the risk of toxicity. To prevent harm, clinicians adjust the dose or extend the dosing interval based on measures of renal function, such as creatinine clearance or estimated glomerular filtration rate (eGFR).

Liver function can also necessitate adjustments for drugs that are primarily cleared by the liver, but kidney function is the more universally encountered factor across a broad range of medications. Weight or age can influence dosing for specific drugs, but they do not require dose adjustments as routinely as changes in renal function.