Analgesics/pharmacology; Anti-Inflammatory Agents/pharmacology; Pain/drug therapy; Pyrazoles/pharmacology; Analgesics/administration & dosage; Analgesics/chemistry; Analgesics/therapeutic use; Animals; Anti-Inflammatory Agents/administration & dosage; Anti-Inflammatory Agents/chemistry; Anti-Inflammatory Agents/therapeutic use; Arthritis, Experimental/drug therapy; Arthritis, Experimental/enzymology; Arthritis, Experimental/metabolism; Arthritis, Experimental/pathology; Body Weight/drug effects; Chronic Disease/drug therapy; Creatinine/blood; Dipyrone/administration & dosage; Dipyrone/pharmacology; Disease Models, Animal; Dose-Response Relationship, Drug; Edema/blood; Edema/drug therapy; Edema/enzymology; Edema/pathology; Haptoglobins/metabolism; Inflammation/blood; Inflammation/drug therapy; Inflammation/enzymology; Inflammation/pathology; Leukocytes/drug effects; Leukocytes/metabolism; Male; Organ Size/drug effects; Pain/blood; Pain/enzymology; Pain/pathology; Pyrazoles/administration & dosage; Pyrazoles/chemistry; Pyrazoles/therapeutic use; Rats; Rats, Wistar; Reference Standards; Stomach/drug effects; Stomach/pathology; Time Factors; Tumor Necrosis Factor-alpha/metabolism; Urea/blood