To determine the eligibility requirements for Lipitor discounts, we can refer to the provided sources. The first source, Drug Patent Watch, provides information about the patent status of Lipitor but does not mention anything about discounts or eligibility requirements [1]. The second source, the official Lipitor website, offers a savings program for eligible patients. However, the specific eligibility requirements are not mentioned on the website [2]. The third source, Pfizer RxPathways, is a patient assistance program provided by Pfizer, the manufacturer of Lipitor. This program offers assistance to eligible patients who are uninsured or underinsured and meet certain income criteria. However, the income criteria are not specified on the website [3].

Based on the information provided in the sources, it is clear that the eligibility requirements for Lipitor discounts are not explicitly mentioned. It is recommended to directly contact Pfizer or consult with a healthcare professional to obtain accurate and up-to-date information on the eligibility requirements for Lipitor discounts.

Sources:
[1] Drug Patent Watch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Lipitor. Savings. Retrieved from https://www.lipitor.com/en/savings
[3] Pfizer RxPathways. Retrieved from https://www.pfizerrxpathways.com/%3Cfront%3E