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Lipitor, also known as atorvastatin, is a medication used to treat high cholesterol and prevent heart disease. The recommended dosage and frequency of taking Lipitor vary depending on individual factors, such as age, weight, and medical history.

According to the prescribing information provided by Pfizer, the manufacturer of Lipitor, the recommended starting dose is 10-20 mg once daily [1]. However, the dose may need to be adjusted based on the patient's response to treatment.

The American Heart Association recommends that patients taking Lipitor or other statins take them at the same time every day, ideally in the evening [2]. This is because the body's cholesterol levels tend to peak in the morning, and taking the medication in the evening can help reduce cholesterol production during the night.

It's essential to note that Lipitor should be taken consistently and at the same time every day to maintain its effectiveness. Taking the medication irregularly or skipping doses can lead to reduced efficacy and increased risk of side effects [3].

In terms of frequency, Lipitor is typically taken once daily, as recommended by the prescribing information. However, in some cases, patients may need to take it twice daily, depending on their specific medical condition and response to treatment.

In conclusion, the recommended frequency of taking Lipitor is once daily, ideally in the evening. However, the dosage and frequency may vary depending on individual factors and medical conditions.

Sources:

[1] Pfizer. (2020). Lipitor Prescribing Information. Retrieved from <https://www.pfizer.com/healthcare-professionals/product-information/lipitor-prescribing-information>

[2] American Heart Association. (2020). Cholesterol Medications. Retrieved from <https://www.heart.org/en/healthy-living/healthy-eating/eat-smart/nutrition-basics/cholesterol-medications>

[3] DrugPatentWatch.com. (2020). Atorvastatin (Lipitor) Patent Expiration. Retrieved from <https://www.drugpatentwatch.com/patent/US-6-197-444>

Note: The sources cited are subject to change, and it is recommended to verify the information with the original sources.