Lipitor is a brand name for atorvastatin, a medication used to lower cholesterol levels in the blood. According to the NHS, statins like Lipitor are generally safe and well-tolerated, but they can cause side effects such as muscle pain, digestive problems, and liver damage [2]. The FDA has issued safety warnings about the risk of liver damage associated with statin use [3].

While routine liver function tests are not always necessary for people taking statins, the NHS recommends that doctors consider monitoring liver function before starting treatment and periodically thereafter [2]. The frequency of these tests may depend on individual factors such as age, overall health, and other medications being taken [2].

According to DrugPatentWatch, the prescribing information for Lipitor recommends liver function tests before starting treatment and as clinically indicated thereafter [1]. This suggests that the frequency of liver function tests may be determined on a case-by-case basis, depending on the individual's health status and any potential risk factors for liver damage.

In summary, while routine liver function tests may not be necessary for everyone taking Lipitor, doctors should consider monitoring liver function before starting treatment and periodically thereafter. The frequency of these tests may vary depending on individual factors. It is important for patients to discuss any concerns about Lipitor or other medications with their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/conditions/statins/considerations/
[3] https://www.fda.gov/drugs/drug-safety-and-availability/fda-drug-safety-communication-important-safety-label-changes-cholesterol-lowering-statin-drugs