Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the body. According to the NHS, some of the common side effects of atorvastatin include headache, nausea, diarrhea, constipation, and muscle and joint pain. However, not everyone experiences these side effects and they usually go away after a few days or weeks. More serious side effects are rare but can occur, including liver problems, muscle damage, and an increased risk of diabetes. Patients who experience any of these side effects should consult their doctor immediately.

Drugwatch also notes that some patients may experience cognitive impairment, such as memory loss or confusion, while taking atorvastatin. However, the risk of this is low and the benefits of taking the medication usually outweigh the risks. Additionally, atorvastatin can interact with other medications, such as antibiotics and antifungal drugs, so patients should inform their doctor of any other medications they are taking.

It is important to note that Lipitor should only be taken under the guidance of a healthcare professional and patients should follow their doctor's instructions carefully. Patients should also inform their doctor of any pre-existing medical conditions, such as liver or kidney problems, as these may affect the safety and effectiveness of the medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.drugwatch.com/lipitor/side-effects/