Lipitor is a prescription drug used to treat high cholesterol levels in the blood. It is a widely used drug and has been on the market for over two decades. While it has been effective in reducing cholesterol levels, it has also been associated with some side effects.

According to DrugPatentWatch [1], Lipitor's patent expired in 2011, and the drug is now available in generic form. The expiration of the patent has led to a decrease in the price of the drug, making it more accessible to patients.

However, Lipitor has been associated with some side effects. Medical News Today [2] reports that common side effects of Lipitor include muscle pain, weakness, and tenderness, as well as nausea, stomach pain, and constipation. In rare cases, Lipitor has been associated with serious side effects such as liver damage, memory loss, and type 2 diabetes.

DrugWatch [3] also notes that Lipitor has been associated with an increased risk of developing muscle-related side effects, including rhabdomyolysis, a serious condition that can cause kidney damage and even death. The risk of developing muscle-related side effects is higher in patients who take higher doses of Lipitor or who take the drug in combination with other medications.

In conclusion, while Lipitor has been an effective drug in reducing cholesterol levels, it has been associated with some side effects. Patients who experience any side effects while taking Lipitor should consult their healthcare provider immediately. It is important to weigh the benefits and risks of taking Lipitor with a healthcare provider before starting the medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects
[3] https://www.drugwatch.com/lipitor/side-effects/