Lipitor is a brand name for atorvastatin, which is a type of medication called a statin. Statins are commonly used to lower cholesterol levels in the blood, which can reduce the risk of heart disease and stroke. While Lipitor is generally considered safe and effective, like all medications, it can cause side effects in some people.

According to the National Health Service (NHS) [2], the most common side effects of atorvastatin include headache, feeling sick, diarrhea, constipation, and muscle and joint pain. These side effects are usually mild and go away on their own within 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 developing type 2 diabetes.

Drugwatch [3] reports that Lipitor may also cause memory loss, confusion, and other cognitive problems, although these side effects are rare. In addition, the website notes that atorvastatin can interact with other medications, such as blood thinners and antibiotics, which can increase the risk of side effects.

It is important to note that not everyone who takes Lipitor will experience side effects, and many people find that the benefits of the medication outweigh any potential risks. However, if you are concerned about the side effects of Lipitor or are experiencing any unusual symptoms while taking the medication, you should speak to your doctor or pharmacist.

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