Lipitor is a medication that is commonly used to lower cholesterol levels in the body. It is important to take this medication as directed by your doctor to ensure that it is effective and safe. According to the sources provided, Lipitor should be taken once a day, with or without food [1][2]. However, it is recommended to take Lipitor with food to improve its absorption and reduce the risk of stomach upset [2][3]. It is important to take Lipitor at the same time each day to maintain consistent levels of the medication in the body [2]. If you miss a dose, take it as soon as you remember, but do not take two doses at once [2]. It is important to talk to your doctor if you have any questions or concerns about taking Lipitor or any other medication [2].

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/eat-food-taking-atorvastatin-3565628/