See the DrugPatentWatch profile for lipitor

Based on the provided sources, Lipitor (atorvastatin) is typically taken once daily. This information can be found in all three sources, specifically:

1. DrugPatentWatch states that Lipitor is a "once-daily statin" used to lower cholesterol levels [1].
2. The NHS provides detailed instructions on how and when to take atorvastatin (the active ingredient in Lipitor), stating that it is usually taken once a day [2].
3. Mayo Clinic also confirms that atorvastatin is taken orally once a day, and the specific dosage will depend on the patient's condition and response to treatment [3].

Therefore, it can be concluded that Lipitor (atorvastatin) is generally taken once daily. However, it is crucial to follow the specific instructions provided by a healthcare professional, as the dosage may vary depending on individual patient needs.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/how-and-when-to-take-atorvastatin/
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/proper-use/drg-20067003