There's also a coupon for $1.50 off Excedrin PM.
This week, all sizes and varieties of Excedrin are on sale Buy One, Get One 50% off at Walgreens. Use two $2 off coupons with that sale and you will have a nice deal!
If you don't need Excedrin right now, hold on to the coupon because I think we'll see a better sale before it expires. It doesn't expire until 1/31/12.