Based on the available information, there are potential interactions when combining Lipitor (atorvastatin) and warfarin. It is crucial to consult with a healthcare professional or pharmacist before starting or changing any medication regimen.

Lipitor is a statin drug used to lower cholesterol levels, while warfarin is an anticoagulant that prevents blood clots. According to DrugPatentWatch.com [1], both medications have been extensively studied and are commonly prescribed. However, combining the two can increase the risk of bleeding due to warfarin's blood-thinning properties.

A study published in the Journal of Clinical Pharmacy and Therapeutics [2] found that atorvastatin (Lipitor) had a moderate interaction with warfarin. The study suggested that patients taking both medications should be closely monitored for signs of bleeding or anemia.

In summary, while Lipitor and warfarin can be taken together, it is essential to consult a healthcare professional or pharmacist to ensure proper monitoring and dosage adjustments.

Sources:

1. DrugPatentWatch.com: <https://www.drugpatentwatch.com/drugs/atorvastatin>
2. Journal of Clinical Pharmacy and Therapeutics: <https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2710.2005.00661.x>