Grapefruit, including segments, significantly increases statin blood levels by inhibiting their metabolism, raising the risk of severe side effects like muscle damage.
Interaction affects whole grapefruit segments, not just juice, due to furanocoumarin content.
Most severe with simvastatin (avoid >1 small fruit daily).
Even small amounts can interact; effects may last up to 72 hours.
Safer alternatives: fluvastatin, pravastatin, or rosuvastatin have minimal interaction.
Grapefruit contains furanocoumarins that irreversibly inhibit the CYP3A4 enzyme in the intestines and liver, which is responsible for metabolizing statins such as simvastatin, atorvastatin, and lovastatin, leading to elevated plasma concentrations of the drug.
Heightened risk of statin-induced myopathy, rhabdomyolysis, liver toxicity, and kidney issues; symptoms may include muscle pain, weakness, dark urine, and fatigue.
Avoid grapefruit and its products entirely while on CYP3A4-metabolized statins (e.g., simvastatin, atorvastatin); opt for unaffected statins like pravastatin or rosuvastatin if possible; monitor CK levels and symptoms closely; consult a healthcare provider before any grapefruit consumption.
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