Lipitor, also known as atorvastatin, is a medication commonly prescribed to lower cholesterol levels. While it is generally well-tolerated, like any medication, it can have side effects. Some individuals may develop allergic reactions to Lipitor after long-term usage. The NHS website notes that uncommon side effects of atorvastatin include allergic reactions such as swelling of the face, lips, tongue, and throat, which can cause difficulty breathing or swallowing [2]. Medical News Today also highlights that allergic reactions to Lipitor are possible, albeit rare [3]. It is essential for individuals taking Lipitor to be aware of any signs of allergic reactions and seek immediate medical attention if they occur. Regular monitoring and communication with healthcare providers can help manage any potential adverse effects that may arise during long-term use of Lipitor.

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