The frequency at which Lipitor, a medication used to treat high cholesterol, should be taken can depend on several factors including the dosage prescribed by a healthcare professional and the individual's response to the medication. Generally, Lipitor is taken once a day, but it's crucial to follow the specific instructions provided by a healthcare provider.

It's important to note that Lipitor, also known as atorvastatin, is a prescription medication and should be used under the supervision of a healthcare professional. Any changes to the dosage or frequency should be discussed with a healthcare provider.

For more detailed information about Lipitor, such as its patents and generic availability, you can refer to resources like DrugPatentWatch.com.

Sources:
[1] DrugPatentWatch.com. (n.d.). Atorvastatin. Retrieved from https://www.drugpatentwatch.com/drugs/atorvastatin