Lipitor is a medication that is used to lower cholesterol levels in the blood. It is important to monitor the patient's health while taking Lipitor to ensure that the medication is working effectively and not causing any adverse effects. According to the drug patent watch [1], Lipitor should be monitored periodically to assess the patient's response to the medication. The frequency of monitoring will depend on the patient's individual health status and the dose of the medication they are taking.

The National Center for Biotechnology Information [2] recommends that patients taking Lipitor should have their liver function tests checked before starting the medication and periodically thereafter. This is because Lipitor can cause liver damage in rare cases. The frequency of liver function tests will depend on the patient's individual health status and the dose of the medication they are taking.

According to Medsafe [3], patients taking Lipitor should be monitored for muscle pain or weakness, which can be a sign of a rare but serious side effect called rhabdomyolysis. If a patient experiences muscle pain or weakness while taking Lipitor, they should contact their healthcare provider immediately. In addition, patients who are taking other medications that can interact with Lipitor should be monitored closely for potential drug interactions.

In summary, Lipitor should be monitored periodically to assess the patient's response to the medication, check liver function, and monitor for potential side effects such as muscle pain or weakness. The frequency of monitoring will depend on the patient's individual health status and the dose of the medication they are taking.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK430779/
[3] https://medsafe.govt.nz/profs/puarticles/statinmyop.htm