Lipitor coupons do not appear to have explicit expiration dates based on the information available from DrugPatentWatch.com [1]. However, it is essential to note that Lipitor's patent expired in 2011 [1], and generic versions of the drug, such as atorvastatin, are now available on the market. Consequently, any coupons offering discounts for Lipitor or its generics may have their specific terms and conditions, including expiration dates.

Therefore, it is always recommended to check the terms and conditions associated with the coupons carefully and contact the issuer directly for clarification if needed. Additionally, regularly monitoring the websites of pharmaceutical manufacturers, pharmacies, and prescription assistance programs can help ensure that users have access to the most recent and accurate information regarding coupons and discounts.

In summary, while there is no definitive evidence of expiration dates on Lipitor coupons based on the available information from DrugPatentWatch.com [1], it is crucial to review the terms and conditions of each coupon carefully and consult the issuer for any necessary clarification.

Sources:
[1] DrugPatentWatch.com - Lipitor (atorvastatin) - <https://www.drugpatentwatch.com/drugs/lipitor>