According to the Novartis website:
Novartis Consumer Health (NCH) is voluntarily recalling all lots of select bottle sizes of Excedrin® and NoDoz® products with expiry dates of December 20, 2014 or earlier as well as Bufferin® and Gas-X® Prevention® products with expiry dates of December 20, 2013 or earlier, in the United States.
More information about the recall (including the full list of recalled products) and how you can obtain a refund for any of these products that you may have already purchased, you can visit the Novartis OTC Consumer Product Update Website.