Lipitor is a prescription drug that contains atorvastatin, which is used to treat high cholesterol levels in the blood [1]. According to the provided sources, there is no direct link between Lipitor and breathing difficulties during yoga practice. However, it is essential to understand the potential side effects of Lipitor, which can include muscle pain, weakness, and fatigue [1]. These side effects may impact an individual's ability to perform physical activities, including yoga practice.

Breathing difficulties during yoga practice can also be caused by overexertion or improper technique [2][3]. It is essential to practice yoga safely and within one's physical limits. Overdoing yoga practice can lead to muscle strain, fatigue, and even injury [3]. It is recommended to consult with a healthcare professional before starting a yoga practice, especially if you have any pre-existing medical conditions.

In conclusion, there is no evidence to suggest that Lipitor directly affects breathing during yoga practice. However, it is important to be aware of the potential side effects of Lipitor, which may impact physical activity. It is also essential to practice yoga safely and within one's physical limits to avoid overexertion and injury.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/
[3] https://www.everydayhealth.com/yoga/are-you-doing-too-much-yoga-heres-how-to-tell-and-why-it-can-be-risky/