Lipitor (atorvastatin) and warfarin are both commonly prescribed medications. Lipitor is a statin used to lower cholesterol levels, while warfarin is an anticoagulant that helps prevent blood clots. When taken together, Lipitor can potentially affect the effectiveness of warfarin. Lipitor has been reported to interact with warfarin, leading to an increased risk of bleeding due to its potential to enhance the anticoagulant effects of warfarin. This interaction may necessitate closer monitoring of the patient's INR (International Normalized Ratio) levels to ensure they remain within the therapeutic range and to prevent complications. Patients taking both medications should be closely monitored by healthcare providers to adjust dosages if needed and to watch for signs of bleeding or other adverse effects. It is important for patients to inform their healthcare providers about all medications they are taking to prevent potential drug interactions and ensure safe and effective treatment.

Sources:
[1] drugpatentwatch.com
[2] ncbi.nlm.nih.gov
[3] drugs.com