Lipitor is a brand name for atorvastatin, a medication used to lower cholesterol levels in the blood. Allergic reactions to Lipitor are rare, but they can occur. Symptoms of a Lipitor allergy may include skin rash, itching, hives, swelling of the face, lips, tongue, or throat, difficulty breathing, and chest tightness [2]. In some cases, an allergic reaction to Lipitor can cause a severe condition called anaphylaxis, which is a medical emergency that requires immediate treatment [3].

It is important to note that not all side effects of Lipitor are caused by an allergy. Common side effects of Lipitor include headache, muscle pain, joint pain, diarrhea, and nausea [1]. These side effects usually go away on their own and do not require medical attention. However, if you experience any of the symptoms of an allergic reaction to Lipitor, you should seek medical help immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.114.013189
[3] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/