Lipitor is a medication used to treat high cholesterol levels and to reduce the risk of heart disease and stroke. According to the sources provided, allergies are not listed as a common side effect of atorvastatin, the active ingredient in Lipitor. However, some individuals may experience an allergic reaction to atorvastatin or any of its inactive ingredients, which can cause symptoms such as hives, difficulty breathing, and swelling of the face, lips, tongue, or throat [2][3]. If you experience any of these symptoms, seek medical attention immediately. It is important to note that allergies can be unpredictable and can occur even if you have taken the medication before without any issues [2]. If you have a history of allergies or have experienced an allergic reaction to any medication in the past, it is important to inform your healthcare provider before taking Lipitor or any other medication [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003