There is currently no definitive scientific evidence to suggest that the effectiveness of Lipitor, a medication used to treat high cholesterol, is altered by the use of multivitamins. Lipitor, also known as atorvastatin, works by reducing the amount of cholesterol produced by the body, thereby helping to reduce the risk of heart attack and stroke [1].

Multivitamins, on the other hand, contain various vitamins and minerals that are essential for the body's normal growth and development. They are typically used to provide nutrients that may be lacking in a person's diet [2].

While both Lipitor and multivitamins can be important for maintaining good health, there is no published research indicating an interaction between the two. The drug information website, Drugs.com, does not list multivitamins as an interacting drug with Lipitor [3]. Similarly, a search on DrugPatentWatch.com, a website that provides information on drug patents and related news, does not yield any results suggesting an interaction between Lipitor and multivitamins [4].

However, it is always important to consult with a healthcare provider or pharmacist before starting any new medication or supplement, including multivitamins, to ensure that it is safe and appropriate for your individual health situation.

Sources:
[1] Mayo Clinic. (2021). Atorvastatin (Oral Route). Retrieved from https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/description/drg-20063096
[2] National Institutes of Health. (2021). Multivitamin/Mineral Supplements. Retrieved from https://ods.od.nih.gov/factsheets/MVMS-Consumer/
[3] Drugs.com. (2021). Atorvastatin. Retrieved from https://www.drugs.com/atorvastatin.html
[4] DrugPatentWatch.com. (2021). Lipitor. Retrieved from https://www.drugpatentwatch.com/drugs/lipitor