Based on the information available, there is no known adverse reaction between Lipitor (atorvastatin), a cholesterol-lowering medication, and avocado consumption.

Lipitor is a statin drug that works by blocking a substance your body needs to make cholesterol. It's used to treat high cholesterol and to lower the risk of stroke, heart attack, and other heart complications in people with type 2 diabetes or risk factors for heart disease. Avocados, on the other hand, are rich in healthy fats, fiber, and various important nutrients.

While both Lipitor and avocados can interact with other substances or medications, there is no specific adverse reaction identified between the two. However, it's always important to consult with a healthcare provider or pharmacist if you have concerns about potential interactions with medications or dietary changes.

Sources:
[1] <https://www.drugs.com/drug-interactions/atorvastatin.html>
[2] <https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/avocado/art-20045561>
[3] <https://www.drugpatentwatch.com/drugs/lipitor>