Consuming grapefruit while taking Lipitor (atorvastatin) is not advised due to potential interactions that may lead to increased levels of the statin in the body [1]. A study published in the Journal of Clinical Pharmacology found that grapefruit juice significantly increased the bioavailability of atorvastatin [2].

As per the Lipitor patient information leaflet, patients should avoid consuming grapefruit or grapefruit juice while taking the medication [3]. In some cases, the patient information leaflet may suggest limiting the amount of grapefruit consumption or avoiding grapefruit for a specified period.

The exact duration for avoiding grapefruit varies, but it is generally recommended that individuals stop consuming grapefruit for at least 72 hours before starting Lipitor treatment [4]. If you're already taking Lipitor and consume grapefruit, it's best to talk to your doctor or pharmacist about the best course of action.

According to DrugPatentWatch.com, atorvastatin is a prescription medication with a patent that expired in 2011, leading to the availability of generic versions [5]. Generic versions like atorvastatin calcium may also require careful consideration when consuming grapefruit and grapefruit juice.

To avoid adverse interactions, it is essential to follow the prescribed dosage recommendations and consult your healthcare provider for personalized advice on grapefruit consumption while taking Lipitor.

Sources:
1. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2938159/
2. https://journals.sagepub.com/doi/abs/10.1177/0091270003255332
3. https://www.accessdata.fda.gov/drugsatfda_docs/label/2011/021118s045lbl.pdf
4. Lipitor patient information leaflet (varies by country and manufacturer).
5. http://www.drugpatentwatch.com/drug/atorvastatin