The sources provided do not provide any information about flexibility in relation to Lipitor or any other medication. The first source is a database of drug patents, the second is an article about US-Iran policy, and the third is a website for a healthcare information provider. Therefore, it is not possible to answer the question based on these sources. It is recommended to consult a medical professional for advice on the best solution for flexibility.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.reuters.com/article/us-iran-nuclear-usa/u-s-iran-policy-depends-not-just-on-sanctions-but-on-flexibility-idUSKCN1N6601
[3] https://www.wolterskluwer.com/en/solutions/medi-span/about/gpi