There is no known interaction between Lipitor and avocado. Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood [1]. According to the sources provided, there is no evidence to suggest that consuming avocado will affect the efficacy of Lipitor or cause any adverse reactions. However, it is important to note that some medications can interact with certain foods and drinks, leading to reduced effectiveness or increased side effects. For example, grapefruit juice can interfere with the metabolism of Lipitor and increase the risk of side effects [2]. Therefore, it is always a good idea to consult with a healthcare provider or pharmacist before combining any medication with food or drink, including avocado.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.statnews.com/2016/11/03/medications-food-drug-interactions/
[3] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details/list-interaction-food