Lipitor is a prescription drug used to treat high cholesterol levels in the blood. It belongs to a group of drugs called statins, which work by reducing the amount of cholesterol produced by the liver [3]. According to the NHS, statins are generally safe and well-tolerated by most people. However, like all medications, they can cause side effects, and in rare cases, they can cause liver damage [2].

The frequency of liver monitoring while taking Lipitor depends on several factors, including the patient's age, medical history, and the dose of the medication. According to the NHS, liver function tests should be performed before starting treatment with Lipitor and then again at 12 weeks and 12 months after starting treatment. After that, liver function tests should be performed periodically, as recommended by the prescribing doctor [2].

It is important to note that liver damage caused by Lipitor is rare. According to Drug Patent Watch, the incidence of liver damage associated with Lipitor is less than 1 in 10,000 patients [1]. However, if a patient experiences symptoms such as abdominal pain, yellowing of the skin or eyes, or dark urine while taking Lipitor, they should contact their doctor immediately [2].

In conclusion, while taking Lipitor, liver function tests should be performed before starting treatment, at 12 weeks and 12 months after starting treatment, and periodically thereafter, as recommended by the prescribing doctor. Although liver damage caused by Lipitor is rare, patients should be aware of the symptoms of liver damage and contact their doctor immediately if they experience any of them.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/conditions/statins/considerations/
[3] https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/statins