Does grapefruit interact with Lipitor?
Grapefruit inhibits the CYP3A4 enzyme in the gut, which metabolizes atorvastatin (Lipitor). This raises atorvastatin blood levels by up to 2.5-fold, increasing risks of muscle damage (myopathy or rhabdomyolysis) and liver issues.[1][2]
How much grapefruit causes problems?
Even one glass (200-250 mL) of grapefruit juice daily can boost atorvastatin exposure. Whole grapefruit or juice has the strongest effect; avoid both while on Lipitor.[1][3]
What are the risks of mixing them?
Elevated atorvastatin levels heighten myopathy risk (muscle pain/weakness) from 1 in 10,000 to potentially 1 in 1,000 or higher. Severe cases lead to rhabdomyolysis, kidney failure, or death. Liver enzyme elevations also rise.[1][2][4]
How long does the interaction last?
Enzyme inhibition persists up to 72 hours after grapefruit consumption. Skip Lipitor for 3-4 days after grapefruit or switch statins.[2][3]
Which statins are safe with grapefruit?
Pravastatin, rosuvastatin, and fluvastatin have minimal interaction. Lovastatin and simvastatin carry higher risks like Lipitor.[1][4]
What does the FDA and label say?
FDA warns against grapefruit juice with Lipitor, as it increases side effect risk. Lipitor label advises avoiding grapefruit products.[2][3]
Sources
[1]: FDA Drug Safety Communication on Grapefruit Juice Interactions
[2]: Lipitor Prescribing Information (Pfizer)
[3]: Drugs.com: Grapefruit Drug Interactions
[4]: Mayo Clinic: Statins and Grapefruit