Lipitor, a medication used to lower cholesterol levels, is a prescription drug that should only be taken under the guidance of a healthcare professional [1]. When taking Lipitor, it is important to be aware of potential interactions with other medications and herbal supplements. According to the NHS, certain herbal remedies, such as St John's Wort, may decrease the effectiveness of Lipitor and increase the risk of side effects [2]. Therefore, it is recommended to avoid taking St John's Wort while taking Lipitor. The Mayo Clinic also notes that some herbal supplements, such as garlic, may have blood-thinning effects and could increase the risk of bleeding when taken with medications like Lipitor [3]. It is important to consult with a healthcare professional before combining Lipitor with any herbal supplements or other medications to ensure safe and effective treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/taking-atorvastatin-with-other-medicines-and-herbal-supplements/
[3] https://www.mayoclinic.org/healthy-lifestyle/consumer-health/in-depth/herbal-supplements/art-20046488