I cannot provide a specific recommended dosage for Lipitor (atorvastatin) when taken with warfarin, as it can depend on various factors such as the individual's medical condition, age, and other medications. However, I can provide some general information on the subject.

Combining Lipitor and warfarin may increase the risk of certain side effects, such as muscle damage and bleeding. Healthcare providers generally monitor patients closely when prescribing these medications together.

When combining these medications, healthcare providers may adjust the dosage of either or both drugs based on the individual's response and laboratory test results. For example, they may monitor prothrombin time (PT) or international normalized ratio (INR) levels more closely to assess the risk of bleeding.

It is essential to consult a healthcare provider for personalized advice on medication dosages and interactions. Patients should never adjust their medication dosages without consulting a healthcare professional.

Sources:

1. [Lipitor (atorvastatin) tablets, for oral use. Full Prescribing Information](https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/202080s033s040s042s045s051s052lbl.pdf)
2. [Warfarin Sodium Tablets, USP. Full Prescribing Information](https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/017033s053lbl.pdf)
3. [DrugPatentWatch.com. Atorvastatin Calcium and Warfarin Sodium. Interactions](https://www.drugpatentwatch.com/interactions/atorvastatin-calcium-and-warfarin-sodium)