Lipitor is a brand name for atorvastatin, a medication used to lower cholesterol levels in the blood. According to the Drug Patent Watch [1], there are no known interactions between Lipitor and herbs. However, the use of herbal supplements can have side effects that may interact with Lipitor.

Ginkgo biloba is an herbal supplement that is used to improve memory and cognitive function. According to the Mayo Clinic [3], Ginkgo biloba can cause bleeding when taken with blood-thinning medications, such as aspirin, warfarin, and heparin. Lipitor is not a blood-thinning medication, but it is important to note that Ginkgo biloba can increase the risk of bleeding, which may be a concern for individuals taking Lipitor who are also taking other medications that increase the risk of bleeding.

Another potential side effect of Ginkgo biloba is its effect on liver enzymes. A study published in the Journal of Clinical Pharmacology [2] found that Ginkgo biloba can increase the activity of liver enzymes, which can affect the metabolism of drugs such as Lipitor. This may lead to increased levels of Lipitor in the blood, which can increase the risk of side effects.

It is important to consult with a healthcare provider before taking any herbal supplements, especially if you are taking medications such as Lipitor. Healthcare providers can advise on potential interactions and monitor for any side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4593660/
[3] https://www.mayoclinic.org/drugs-supplements-ginkgo/art-20362032