Log dose–response curves for antinociception induced by IBU, CEL, PAR, and LEV in a visceral nociception model in mice. Each point represents the mean ± SEM obtained in 6–10 animals. %AN = percentage of antinociceptive activity; CEL = celecoxib; IBU = ibuprofen; LEV = levetiracetam; PAR = paracetamol.