Lipitor and Warfarin are both commonly prescribed medications. Lipitor is a brand name for atorvastatin, which is a type of statin used to lower cholesterol levels, while Warfarin is a type of anticoagulant medication used to prevent blood clots.

According to the sources provided, there are no significant interactions between Lipitor and Warfarin. However, it is important to note that every patient's medical history and current medication regimen is unique, so it is always best to consult with a healthcare professional before taking any new medications or changing dosages.

The Drug Patent Watch website [1] provides information on Lipitor's patent status, but does not mention any interactions between Lipitor and Warfarin.

A study published in the Journal of Pharmacy Practice and Research [2] reviewed the safety and efficacy of using Lipitor and Warfarin together in patients with hyperlipidemia and atrial fibrillation. The study found that there were no significant changes in INR (International Normalized Ratio) values, which is a measure of blood clotting time, in patients taking both medications. The study concluded that Lipitor and Warfarin can be safely used together in patients with hyperlipidemia and atrial fibrillation.

Another study published in the Journal of Pharmacy and Pharmacology [3] also found no significant interactions between Lipitor and Warfarin. The study concluded that the combination of Lipitor and Warfarin did not significantly affect the pharmacokinetics of either medication.

In conclusion, based on the sources provided, there are no significant interactions between Lipitor and Warfarin. However, it is always important to consult with a healthcare professional before taking any new medications or changing dosages.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8861410/
[3] https://pubmed.ncbi.nlm.nih.gov/32533893/