Based on the information provided, it seems possible that you could use a coupon for Lipitor at Walmart, but it is not guaranteed. Here's why:

Walmart offers a 4-tier prescription program, which allows customers to access medications at reduced costs. However, the program does not specifically list Lipitor in its formulary [${2}]. This means that Walmart may not offer Lipitor at a discounted price through its prescription program.

However, there are independent services like GoodRx that provide coupons for prescription medications, including Lipitor [${3}]. These coupons could potentially be used at Walmart or other pharmacies to reduce the cost of Lipitor. It's important to note that the effectiveness of these coupons can vary and may depend on factors such as your insurance coverage and the specific pharmacy's policies.

In conclusion, while Walmart's prescription program may not offer a discount on Lipitor, you might be able to use a coupon from a service like GoodRx to reduce the cost. However, this is not guaranteed and would depend on individual circumstances.

Sources:
[1] - https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] - https://www.walmart.com/cp/4-prescriptions/1078664
[3] - https://www.goodrx.com/atorvastatin