After reviewing the available information, there is no definitive evidence to suggest that Lipitor (atorvastatin) causes new side effects upon restarting the medication. Lipitor is a statin drug used to treat high cholesterol and prevent cardiovascular disease [1].

According to the prescribing information provided by the U.S. Food and Drug Administration (FDA), the most common side effects of Lipitor include diarrhea, upset stomach, and muscle and joint pain [2]. However, the FDA does not specify whether these side effects are more likely to occur upon restarting the medication.

DrugPatentWatch.com, a website that tracks drug patents and pharmaceutical market trends, does not provide information on the side effects of Lipitor upon restarting the medication [3].

It is important to note that individual responses to medication can vary, and some people may experience side effects when restarting a medication that they did not experience before. If you have concerns about restarting Lipitor or are experiencing new or worsening side effects, it is important to speak with your healthcare provider [1].

In summary, while there is no evidence to suggest that Lipitor causes new side effects upon restarting, individual responses to medication can vary. If you have concerns or are experiencing side effects, speak with your healthcare provider.

Sources:
[1] Mayo Clinic. Lipitor (Atorvastatin). <https://www.mayoclinic.org/drugs-supplements/lipitor-atorvastatin/description/drg-20063058>.
[2] U.S. Food and Drug Administration. Lipitor (Atorvastatin Calcium) Tablets, for Oral Use. <https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/021367s043lbl.pdf>.
[3] DrugPatentWatch.com. Lipitor (Atorvastatin) Drug Profile. <https://www.drugpatentwatch.com/drugs/lipitor>.