Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the body [1]. According to the National Health Service (NHS), atorvastatin can be taken at any time of the day, but it is recommended to take it at the same time each day to help you remember to take it [2]. It can be taken with or without food, but it is suggested to take it with a glass of water [2].

While there is no specific time of day recommended for taking Lipitor, some studies suggest that taking it at night may be more effective. According to Drugs.com, taking atorvastatin at night may be more effective in reducing the risk of heart attack and stroke, as cholesterol production is higher at night [3]. However, more research is needed to confirm this finding, and ultimately the best time to take Lipitor may vary depending on individual circumstances and medical advice.

In summary, Lipitor can be taken at any time of the day, but it is recommended to take it at the same time each day to help with consistency. While some studies suggest taking it at night may be more effective, this has not been definitively proven and should be discussed with a healthcare provider [1][2][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/