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Knowledge of kidney function is important for dosage of medications that are excreted by the kidneys. Food and Drug Administration (FDA)-approved drug-labeling guides provide adjustments of drug dosages for patients with impaired kidney function. On these labels, serum creatinine; measured creatinine clearance (CrCl); or, most commonly, estimated creatinine clearance using the Cockcroft-Gault equation (eCrCl) are used to estimate kidney function. For most drugs, these labels were developed prior to standardized calibration of creatinine assays and reporting estimated glomerular filtration rate (eGFR) calculated using the Modification of Diet in Renal Disease (MDRD) Study equation or Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation. CKD and Drug Dosing: Information for Providers describes NIDDK's suggestions and rationales for assessment of kidney function for drug-dosing purposes.