Lipitor is a brand name for the medication atorvastatin, which is used to lower cholesterol levels and reduce the risk of heart attack and stroke [1]. According to the National Health Service (NHS) in the UK, Lipitor should be taken once a day, at the same time each day, with or without food [2]. It is important to take Lipitor as directed by a doctor, and not to stop taking it without consulting a healthcare professional.

The timing of when Lipitor is taken may also have an impact on its effectiveness. According to Drugs.com, taking Lipitor at night may be more effective than taking it in the morning, as cholesterol production is highest at night [3]. However, this is not a universal recommendation, and patients should follow the dosing instructions provided by their doctor or pharmacist.

In summary, Lipitor should be taken once a day, at the same time each day, with or without food. The timing of when Lipitor is taken may impact its effectiveness, but patients should follow the dosing instructions provided by their healthcare professional [1-3].

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/