TramadolAcetaminophenAnalgesics, Non-NarcoticAnalgesics, OpioidUracilReceptors, Kainic AcidPain, PostoperativeDrug OverdoseDrug-Induced Liver InjuryCodeinePain MeasurementIminesAnalgesicsAnti-Inflammatory Agents, Non-SteroidalHydromorphoneIbuprofenAntipyreticsDouble-Blind MethodAcute PainAnalgesia, Patient-ControlledPainMorphineAdministration, RectalDose-Response Relationship, DrugLiver Failure, AcuteMolar, Third