Lipitor is a brand name for the medication atorvastatin, which is used to lower cholesterol levels and reduce the risk of heart disease. According to the Mayo Clinic [2], some of the common side effects of atorvastatin include muscle pain and damage, liver damage, digestive problems, and rash or flushing. More serious side effects are rare but can include memory loss, confusion, and type 2 diabetes. The NHS [3] notes that atorvastatin can also cause joint pain, sleep disturbances, and sexual dysfunction. Additionally, the NHS advises that anyone experiencing severe side effects should seek medical attention immediately.

It is important to note that not everyone who takes atorvastatin will experience side effects, and the benefits of the medication may outweigh the risks for some individuals. However, it is crucial to speak with a healthcare provider about any concerns or potential side effects before starting or changing the dosage of atorvastatin [2].

Sources:
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/