Lipitor is a medication used to lower cholesterol levels and reduce the risk of heart disease. While it is generally considered safe and effective, like all medications, it can cause side effects. According to the sources provided, some of the most common side effects of Lipitor include muscle pain, weakness, and tenderness, nausea, diarrhea, constipation, and headache. However, these side effects are usually mild and go away on their own within a few days or weeks.

One of the more serious side effects of Lipitor is muscle damage, which can lead to a condition called rhabdomyolysis. This condition occurs when muscle tissue breaks down and releases a protein called myoglobin into the bloodstream, which can cause kidney damage. While rhabdomyolysis is rare, it can be life-threatening and requires immediate medical attention.

Other potential side effects of Lipitor include liver damage, memory loss, confusion, and high blood sugar levels. However, these side effects are also rare and usually go away once the medication is stopped.

In terms of which side effects linger longest, it is difficult to say as it can vary from person to person. However, muscle pain and weakness are some of the most commonly reported side effects of Lipitor, and these symptoms can persist for several weeks or even months in some cases.

It is important to note that Lipitor should only be taken under the guidance of a healthcare professional, and any potential side effects should be reported to them immediately. If you experience severe or life-threatening side effects, seek medical attention right away.

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