Here is what the Walgreens coupon policy says:
When purchasing a single item, Walgreens accepts one manufacturer coupon and applicable Walgreens coupon(s) for the purchase of a single item.
This means that when you purchase one item, you can use more than one Walgreens coupon! For the following deal, track down two Walgreens coupons. The first is found in the Walgreens Cold and Flu booklet on page 56. I found the Cold and Flu books in my store on the medicine aisle. The second coupon comes from page 29 of the Walgreens Allergy Book. In my store, these booklets were located on the main medicine aisle, near the allergy medicines. Note that you may not be able to find both booklets in every store.
Here’s how the deal will work if you have both coupons: