Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels and reduce the risk of heart disease. As with any medication, there are potential side effects that patients should be aware of.

According to the NHS [2], common side effects of atorvastatin include headache, nausea, diarrhea, constipation, and abdominal pain. These side effects are usually mild and go away on their own, but patients should contact their doctor if they become severe or persistent.

More serious side effects of atorvastatin, while rare, can include muscle pain, weakness, and tenderness, which can be signs of a condition called rhabdomyolysis [2]. Rhabdomyolysis can cause kidney damage and is a medical emergency that requires immediate treatment. Patients should seek medical attention if they experience unexplained muscle pain or weakness while taking atorvastatin.

Other potential side effects of atorvastatin, as listed by the Mayo Clinic [3], include liver damage, memory loss or confusion, and an increased risk of developing type 2 diabetes. However, these side effects are very rare and occur in less than 1% of patients taking the medication.

It is important for patients to discuss any concerns they have about atorvastatin side effects with their doctor before starting the medication. Patients should also inform their doctor of any other medications they are taking, as some drugs can interact with atorvastatin and increase the risk of side effects [1].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003