Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to the sources provided, allergic reactions to Lipitor are rare but possible.

Medical News Today [1] reports that while allergic reactions to atorvastatin are rare, they can occur in some individuals. The symptoms of an allergic reaction can range from mild to severe and can include hives, itching, rash, swelling of the face, lips, tongue, or throat, difficulty breathing, and chest tightness. If an individual experiences any of these symptoms, they should seek medical attention immediately.

The NHS [2] also lists allergic reactions as a possible side effect of atorvastatin. They recommend that individuals should stop taking the medication and seek medical attention immediately if they experience symptoms of an allergic reaction.

Drug Patent Watch [3] does not specifically mention allergic reactions as a side effect of Lipitor, but it does list several other potential side effects of the drug, including muscle pain, liver problems, and gastrointestinal problems.

In conclusion, while allergic reactions to Lipitor are rare, they are possible. If an individual experiences any symptoms of an allergic reaction, they should seek medical attention immediately.

Sources:
[1] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.drugpatentwatch.com/p/tradename/LIPITOR