Lipitor (atorvastatin) is a medication used to lower cholesterol levels, while Warfarin is a blood thinner used to prevent blood clots. Taking both drugs together can increase the risk of bleeding and bruising [3]. The interaction between these drugs can lead to a higher concentration of Warfarin in the blood, which can increase the risk of bleeding [2]. Patients taking both medications should be monitored closely for signs of bleeding, such as easy bruising, nosebleeds, or blood in the urine or stool. In some cases, the dosage of Warfarin may need to be adjusted to avoid complications [1]. It is important to talk to a healthcare provider before taking Lipitor and Warfarin together, as they can help determine the appropriate dosage and monitor for any potential side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8861410/
[3] https://www.drugs.com/drug-interactions/lipitor-with-warfarin-276-128-2311-0.html