Restarting Lipitor, a medication used to lower cholesterol levels, may come with potential side effects. It is important to note that the information provided is based on the sources you provided and may not be exhaustive. Therefore, it is advisable to consult with a healthcare professional for personalized advice.

According to the first source [1], Lipitor's patent expired in 2011, making it available as a generic medication called atorvastatin. This implies that the potential side effects discussed here apply to both Lipitor and atorvastatin.

Common side effects associated with Lipitor include muscle pain or weakness, headache, nausea, diarrhea, and constipation [1]. These side effects are generally mild and may resolve on their own. However, if they persist or worsen, it is recommended to consult a healthcare professional.

More serious side effects, although rare, may occur. These can include liver problems, allergic reactions, and muscle damage [1]. If any of these symptoms are experienced, it is crucial to seek immediate medical attention.

The second source [2] discusses the benefits and risks of statins, the class of medications that Lipitor belongs to. It states that while statins are generally safe and well-tolerated, some individuals may experience side effects. These can include muscle pain, liver abnormalities, and an increased risk of diabetes. However, the article emphasizes that the benefits of statins in reducing the risk of cardiovascular events often outweigh the potential risks.

The third source [3] focuses on the importance of not stopping statin medications without consulting a healthcare professional. It explains that abruptly discontinuing statins can have negative consequences, including an increased risk of heart attack or stroke. Therefore, it is generally recommended to continue taking statins unless advised otherwise by a healthcare professional.

In conclusion, restarting Lipitor or any statin medication may come with potential side effects. Common side effects include muscle pain, headache, and gastrointestinal issues. More serious side effects, although rare, can occur and may require immediate medical attention. It is important to consult with a healthcare professional for personalized advice and to discuss any concerns or potential side effects before restarting Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.bmj.com/content/353/bmj.i3305
[3] https://www.goodrx.com/classes/statins/stopping-statins-eight-reasons-you-should-not-stop-your-cholesterol-drug