Based on the information available, there may be certain restrictions when using the Lipitor discount card. However, the specific restrictions are not explicitly stated in the source provided.

The source, DrugPatentWatch.com, mentions that Pfizer, the manufacturer of Lipitor, offers a savings card that can reduce out-of-pocket costs for the medication [1]. The savings card is available to patients with commercial insurance, as well as those without insurance [1].

However, the source does not provide information on any potential restrictions, such as income limits or restrictions on the number of prescriptions that can be filled with the discount card. It is recommended to check the official Lipitor savings card website or contact Pfizer directly for complete and up-to-date information on any potential restrictions.

In summary, while there may be restrictions on using the Lipitor discount card, the specifics are not provided in the source. It is advisable to consult the official Lipitor savings card website or Pfizer for detailed information.

Sources:
[1] DrugPatentWatch.com. (n.d.). Lipitor - Atorvastatin Calcium. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>