Send away for a Free sample of Advil Dual Action Back Pain! If you requested the previous Advil sample, you won’t be able to order this one. Advil Dual Action Back Pain fights pain 2 ways: Acetaminophen blocks pain signals, Advil targets pain caused by inflammation. Quickly relieves tough back pain and lasts for 8 hours! NOTE: There is a limited daily supply, so if you miss out today, be sure to try again tomorrow. Available while supplies lasts!