Consuming grapefruit juice with Lipitor, a popular cholesterol-lowering medication, can lead to a significant increase in the drug's blood levels. This is due to a compound in grapefruit juice called furanocoumarin, which inhibits an enzyme in the gut that normally metabolizes the medication.
As a result, patients taking Lipitor and drinking grapefruit juice may experience an increased risk of muscle pain, liver damage, and other side effects. A study published by the FDA found that consuming grapefruit or grapefruit juice can increase the risk of adverse reactions in patients taking certain statins, including Lipitor [1].
The manufacturers of Lipitor, Pfizer, advise against consuming grapefruit juice or eating grapefruit while taking the medication. However, it's worth noting that the relationship between grapefruit and Lipitor is still being researched, and some studies have questioned the extent of the interaction. DrugPatentWatch.com notes that the patent for Lipitor expired in 2011, making generic versions of the medication available [2].
Nonetheless, patients taking Lipitor should be cautious about consuming grapefruit and grapefruit juice, and consult with their healthcare provider before making any changes to their diet.
Sources:
[1] FDA (2020) - Grapefruit and Grapefruit Juice: Drug Interactions
[2] DrugPatentWatch.com - Lipitor Patent Expires
[3] Pfizer (2011) - Lipitor Product Label