Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to the sources provided, there is no indication that Lipitor can cause allergic reactions to other medications.

However, Lipitor has several side effects, including common ones such as headache, diarrhea, and nausea, and rare ones such as muscle pain, liver problems, and allergic reactions. If someone experiences an allergic reaction to Lipitor, they should stop taking the medication and seek medical attention immediately.

It is also important to note that atorvastatin can interact with other medications, including blood thinners, antibiotics, and antifungal drugs. Therefore, it is essential to inform the doctor about all the medications that a person is taking before starting Lipitor.

In conclusion, there is no evidence that Lipitor can cause allergic reactions to other medications. However, it is crucial to be aware of the potential side effects and drug interactions of Lipitor and to seek medical attention if any adverse reactions occur.

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