atorvastatin Drug Interactions
Also known as: atorvastatin calcium, Lipitor, Atorvastatin Calcium
Atorvastatin (Lipitor) is a medication that belongs to a class of drugs called statins. It is primarily used to lower high cholesterol levels in the blood and reduce the risk of serious heart problems like heart attack and stroke. It works by helping your body produce less cholesterol.atorvastatin has 2 documented drug interactions in our database, including 0 contraindicated, 1 major, 1 moderate, and 0 minor interactions.
0
Contraindicated
1
Major
1
Moderate
0
Minor
Clarithromycin significantly increases atorvastatin exposure, raising the risk of myopathy and rhabdomyolysis.
Mechanism
Clarithromycin is a potent CYP3A4 inhibitor, reducing atorvastatin first-pass metabolism and increasing plasma levels up to 4-fold.
Clinical Management
Temporarily suspend atorvastatin during short courses of clarithromycin, or use a non-CYP3A4 statin (pravastatin, rosuvastatin).
Concomitant use of atorvastatin and rosuvastatin is generally not recommended as it significantly increases the risk of dose-dependent statin-related adverse effects, particularly myopathy and rhabdomyolysis, without providing substantial additional lipid-lowering benefit. While both drugs lower cholesterol, combining them primarily elevates safety concerns.
Mechanism
Both atorvastatin and rosuvastatin are HMG-CoA reductase inhibitors, and their co-administration leads to an additive pharmacological effect, increasing systemic exposure to statins. This heightened exposure saturates metabolic pathways and increases the likelihood of dose-related toxicities, especially muscle-related adverse events.
Clinical Management
The co-administration of atorvastatin and rosuvastatin should generally be avoided. If a patient requires more intensive lipid lowering than a single statin can provide, alternative strategies such as increasing the dose of a single statin (within recommended limits), or adding a non-statin lipid-lowering agent (e.g., ezetimibe, PCSK9 inhibitor) should be considered. Monitor patients closely for muscle pain, tenderness, or weakness if this combination is inadvertently used.
For complete prescribing information:
View full atorvastatin monograph →Medical Disclaimer
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