According to the sources provided, there is no specific time of day that is recommended for taking Lipitor (atorvastatin). The NHS website [2] suggests that Lipitor can be taken at any time of day, with or without food, but it is best to take it at the same time each day. The website also advises against drinking grapefruit juice while taking Lipitor, as it can increase the risk of side effects.

The DrugPatentWatch website [1] provides information about the drug patent for Lipitor, but does not offer any guidance on the best time of day to take the medication.

The Drugs.com website [3] explains that some studies have suggested that taking Lipitor at night may be more effective at lowering cholesterol levels than taking it during the day. However, the website notes that this is not a universal recommendation and that Lipitor can be taken at any time of day, as directed by a healthcare provider.

In conclusion, while some studies suggest that taking Lipitor at night may be more effective, there is no specific time of day that is recommended for taking the medication. Patients should follow the dosing instructions provided by their healthcare provider and take Lipitor at the same time each day.

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.drugs.com/medical-answers/does-lipitor-work-better-if-you-take-it-at-night-416127/