The paper titled “Is Hippocampus Susceptible to Antinociceptive Tolerance to NSAIDs Like the Periaqueductal Grey?” [1] has been retracted as it is essentially identical in content with a previously published paper titled “Antinociceptive Tolerance to NSAIDs Microinjected into Dorsal Hippocampus” published by the same authors in BMC Pharmacology and Toxicology.