How does protein binding influence lipitor's removal via kidneys?

How does protein binding affect Lipitor removal by the kidneys?

Protein binding limits the amount of Lipitor that reaches the kidneys for removal. Atorvastatin, the active ingredient in Lipitor, binds extensively to plasma proteins, leaving only a small unbound fraction available for filtration. The kidneys filter only the unbound portion of a drug through the glomerulus, so high protein binding reduces renal clearance.

What happens if protein binding changes?

Changes in plasma protein levels or binding affinity can alter the free fraction of the drug. Patients with low albumin or other plasma proteins may have more free atorvastatin, potentially increasing renal clearance. In contrast, displacement by other drugs can raise the fre