Lipitor is a brand name for atorvastatin, a medication used to treat high cholesterol levels and reduce the risk of heart disease. According to Drugs.com [3], Lipitor may interact with other medications and cause allergic reactions. It is important to inform your doctor of all medications, supplements, and vitamins you are taking before starting Lipitor.

Drug Patent Watch [1] lists several patents related to Lipitor, but does not provide information on allergic reactions. Medical News Today [2] also does not specifically mention allergic reactions with other drugs but does list potential side effects of Lipitor. These side effects include muscle pain, weakness, and tenderness, as well as liver problems.

It is important to note that allergic reactions to medications can be serious and even life-threatening. If you experience symptoms such as difficulty breathing, swelling of the face or throat, or hives while taking Lipitor or any other medication, seek medical attention immediately.

In conclusion, while the sources do not specifically mention allergic reactions with other drugs and Lipitor, it is important to inform your doctor of all medications you are taking before starting Lipitor. Additionally, if you experience any symptoms of an allergic reaction while taking Lipitor or any other medication, seek medical attention immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects
[3] https://www.drugs.com/lipitor.html