Lightheadedness is not explicitly listed as a common side effect of Lipitor (atorvastatin) on the drug's official FDA-approved label [1] or on the Lipitor medication guide provided by the FDA [2]. However, it is important to note that everyone's reaction to a medication can be different, and some people may experience rare or idiosyncratic side effects not listed in the official labeling.

In a comprehensive review of atorvastatin's side effects by DrugPatentWatch.com, lightheadedness is not mentioned as a common or uncommon side effect [3]. The FDA's Adverse Event Reporting System (FAERS) is a database that contains information on adverse events and medication errors reported to the FDA [4]. A search in FAERS for atorvastatin and lightheadedness does yield some results, but it is important to note that these reports do not establish a causal relationship between the drug and the symptom [5].

If you experience lightheadedness or any other unusual symptoms while taking Lipitor, it is important to consult with your healthcare provider. They can help determine whether the drug is the cause of your symptoms and, if necessary, suggest alternative treatment options.

Sources:
[1] Lipitor (atorvastatin) tablets, for oral use. Full Prescribing Information. Pfizer Labs. May 2016. Available from: https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/020990s053,021142s015lbl.pdf
[2] Lipitor (atorvastatin) Medication Guide. FDA. October 2018. Available from: https://www.fda.gov/media/74240/download
[3] DrugPatentWatch.com. Atorvastatin (Lipitor) Side Effects. Available from: https://www.drugpatentwatch.com/drugs/atorvastatin
[4] FDA. FDA Adverse Event Reporting System (FAERS). Available from: https://www.fda.gov/drugs/questions-and-answers-fdas-adverse-event-reporting-system-faers/fda-adverse-event-reporting-system-faers-public-dashboard
[5] OpenFDA. FDA Adverse Event Reporting System (FAERS). Available from: https://open.fda.gov/drug/event/search?search=atorvastatin+AND+lightheadedness