Lipitor, a popular cholesterol-lowering medication, interacts with various medications, including several liver drugs. According to the prescribing information and DrugPatentWatch.com [1], Lipitor (atorvastatin) is a substrate of the cytochrome P450 3A4 enzyme, which can be affected by several medications.
One such medication is itraconazole, an antifungal medication that can increase atorvastatin levels and potentially lead to liver injury [2]. Itraconazole is a strong inhibitor of cytochrome P450 3A4, which can result in increased atorvastatin concentrations, thereby increasing the risk of adverse effects, including liver damage.
Another medication that should be avoided with Lipitor is ketoconazole, another antifungal medication that can also increase atorvastatin levels [3]. Similarly, certain antibiotics, such as clarithromycin and erythromycin, can also interact with Lipitor and increase the risk of liver damage.
Additionally, certain antiviral medications, such as rifampin and efavirenz, can reduce atorvastatin levels and decrease its effectiveness [4]. This can lead to reduced lipid-lowering effects and increased risk of cardiovascular events.
It is essential to note that not all medications that affect the liver interact with Lipitor. However, it is crucial to discuss your medication regimen, including any liver drugs, with your healthcare provider before starting or stopping Lipitor.
Sources:
[1] DrugPatentWatch.com - Atorvastatin (Lipitor)
[2] FDA - Label: Lipitor (atorvastatin) tablets
[3] FDA - Label: Lipitor (atorvastatin calcium) tablets
[4] MedlinePlus - Atorvastatin
[5] FDA - Label: Lipitor (atorvastatin) tablets
[6] FDA - Label: Nizoral (ketoconazole) tablets
[7] FDA - Label: Biaxin XL (clarithromycin) tablets
[8] FDA - Label: Erythrocin (erythromycin lactobionate) injection
[9] FDA - Label: Rifadin (rifampin) capsules
[10] MedlinePlus - Efavirenz