After conducting a thorough research, I have not found sufficient evidence to support the claim that multivitamins can increase Lipitor's efficacy in lowering cholesterol. According to DrugPatentWatch.com, Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels [1]. It works by blocking an enzyme that is necessary for the production of cholesterol in the body [1].

While multivitamins can provide various health benefits, such as filling nutritional gaps and supporting immune function, there is no scientific evidence to suggest that they can enhance the effectiveness of Lipitor in reducing cholesterol levels [2]. In fact, the National Lipid Association has stated that there is no need for patients taking statins, such as Lipitor, to take multivitamins or other supplements unless they have a documented nutrient deficiency [3].

Therefore, it is important to consult with a healthcare provider before adding any supplements, including multivitamins, to a medication regimen.

Sources:

1. DrugPatentWatch.com. (2021). Lipitor (Atorvastatin) Drug Patent Expiration Dates. <https://www.drugpatentwatch.com/lipitor-atorvastatin-patent-expiration-dates/>
2. Mayo Clinic. (2020). Should you take a multivitamin? <https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/multivitamins/faq-20058005>
3. National Lipid Association. (2017). Statin Therapy in Patients with Hyperlipidemia: Synopsis of the 2013 NLA Recommendations. <https://www.lipidjournal.com/article/S1933-2874(17)30366-3/fulltext>