There are no known interactions between Lipitor and avocado. Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels. According to Drug Patent Watch [1], atorvastatin is metabolized by the liver and does not interact with food. Similarly, AARP [2] and Stat News [3] mention that there are no known interactions between atorvastatin and avocado. However, it is important to note that grapefruit and grapefruit juice can interact with atorvastatin and increase the risk of side effects. Therefore, it is recommended to avoid consuming grapefruit or grapefruit juice while taking atorvastatin.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.aarp.org/health/drugs-supplements/info-2022/food-medication-interaction.html
[3] https://www.statnews.com/2016/11/03/medications-food-drug-interactions/