Atorvastatin, the generic name for Lipitor, is a medication used to lower cholesterol levels in the body. While it is generally well-tolerated, there are potential side effects that users should be aware of.

Common side effects of atorvastatin include headache, diarrhea, constipation, nausea, and muscle and joint pain [2]. These side effects are usually mild and go away on their own after a short period of time. However, if they persist or become severe, it is important to speak with a healthcare provider.

In rare cases, atorvastatin can cause more serious side effects. These include liver problems, muscle damage, and an increased risk of diabetes [1]. Signs of liver problems include yellowing of the skin or eyes, dark urine, and abdominal pain. Signs of muscle damage include unexplained muscle pain, tenderness, or weakness. If any of these symptoms occur, it is important to seek medical attention right away.

Additionally, atorvastatin can interact with other medications, so it is important to inform a healthcare provider of all medications being taken. It is also important to avoid drinking grapefruit juice while taking atorvastatin, as it can increase the risk of side effects.

In summary, while atorvastatin is generally well-tolerated, there are potential side effects that users should be aware of. Common side effects include headache, diarrhea, constipation, nausea, and muscle and joint pain. More serious side effects, although rare, include liver problems, muscle damage, and an increased risk of diabetes. It is important to seek medical attention if any of these symptoms occur. [1][2][3]

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