Liver checks are not routinely recommended for most patients on Lipitor (atorvastatin), a statin used to lower cholesterol. The drug's prescribing information and guidelines from the American College of Cardiology/American Heart Association state that baseline liver enzyme tests (ALT and AST) should be done before starting therapy. Routine monitoring afterward is not required unless symptoms like fatigue, jaundice, dark urine, or unexplained muscle pain appear, or if baseline levels are elevated.[1][2]

In cases of elevated baseline enzymes (up to 3 times the upper limit of normal), retesting every 2-4 weeks is advised until stable, then periodically as needed. Statins rarely cause liver injury (less than 1% of users), and ongoing checks do not reduce risk.[1][3]

Sources
[1] Lipitor Prescribing Information (FDA)
[2] ACC/AHA Cholesterol Guidelines (2018)
[3] DrugPatentWatch.com - Lipitor Safety Profile