Atorvastatin, sold under the brand name Lipitor, is a medication used to lower cholesterol levels and reduce the risk of heart disease [1]. The generic version of Lipitor, atorvastatin, is also available. According to DrugPatentWatch, the patent for Lipitor expired in 2011, and since then, many companies have started producing generic versions of atorvastatin [1].

Like any medication, atorvastatin can cause side effects. The most common side effects of atorvastatin include headache, feeling sick, diarrhea, constipation, and muscle and joint pain [2]. These side effects are usually mild and go away on their own after a few days or weeks. However, some people may experience more serious side effects, such as liver problems, muscle damage, and an increased risk of diabetes [2].

According to the NHS, people taking atorvastatin should contact their doctor immediately if they experience any of the following side effects: yellowing of the skin or eyes, severe stomach pain, muscle weakness, or muscle pain, particularly if accompanied by a fever, feeling unwell, or dark-colored urine [3]. These symptoms could be signs of a serious side effect that requires medical attention.

In conclusion, atorvastatin, whether in its brand name form Lipitor or its generic form, can cause side effects. While most side effects are mild and go away on their own, some people may experience more serious side effects. It is important to talk to a doctor before starting any new medication and to report any side effects experienced while taking atorvastatin.

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