Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the blood. According to the drug patent watch [1], Lipitor is a statin drug that works by blocking an enzyme in the liver that is responsible for producing cholesterol. While there is no direct evidence that Lipitor can interfere with flexibility in yoga, some side effects of the medication can affect muscle function, including muscle pain, weakness, and stiffness [2].

It is important to note that muscle pain and stiffness can also be caused by overexertion or incorrect form during yoga practice. However, these side effects of Lipitor can make it more difficult to perform certain yoga poses and may require modifications to the practice.

It is also worth noting that yoga is a safe and effective form of exercise for people taking Lipitor or other cholesterol-lowering medications. In fact, regular exercise, including yoga, can help improve cholesterol levels and overall cardiovascular health [3].

In conclusion, while there is no direct evidence that Lipitor can interfere with flexibility in yoga, some of its side effects can affect muscle function. However, yoga can still be a safe and beneficial form of exercise for people taking Lipitor or other cholesterol-lowering medications, as long as modifications are made as necessary and proper form is maintained.

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/myths-about-yoga-that-shouldnt-stop-you-from-doing-it/