Lipitor is a medication used to lower cholesterol levels in the body. According to the sources provided, it is recommended to take Lipitor once a day, preferably at the same time each day [2]. The medication can be taken with or without food [2][3]. However, it is important to note that taking Lipitor with a meal may help to reduce the risk of stomach upset or other gastrointestinal side effects [3]. It is important to follow the dosage instructions provided by your doctor or pharmacist and not to take more or less than prescribed. Additionally, it is important to inform your doctor or pharmacist of any other medications you are taking, as well as any medical conditions you may have, as this may affect the safety and effectiveness of Lipitor [1].

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/