Based on the information available, there is no definitive evidence to suggest that individuals taking Lipitor, a medication used to treat high cholesterol, should avoid probiotic yogurt.

Probiotics, often referred to as "good" bacteria, are live microorganisms that are believed to provide health benefits when consumed, particularly for the digestive system [1]. Yogurt is a common food source of probiotics.

Lipitor, on the other hand, is a statin medication that works by reducing the amount of cholesterol your body absorbs [2]. There are no known interactions between Lipitor and probiotics that would warrant avoiding probiotic yogurt [3].

However, it's always important to consult with a healthcare provider or pharmacist if you have specific concerns about medication interactions. They can provide personalized advice based on your medical history and current medications.

Sources:
[1] Mayo Clinic. (2021). Probiotics. Retrieved from https://www.mayoclinic.org/healthy-lifestyle/consumer-health/in-depth/probiotics/art-20046057
[2] MedlinePlus. (2021). Atorvastatin. Retrieved from https://medlineplus.gov/druginfo/meds/a601249.html
[3] DrugPatentWatch. (2021). Lipitor. Retrieved from https://www.drugpatentwatch.com/drugs/lipitor