Analgesic Efficacy, Safety and Tolerability of Two Paracetamol-Containing Solutions in Post-Surgical Hip Replacement Pain

Inclusion Criteria: * ASA I, II or III and scheduled for elective total hip replacement, using a standard approach and a cemented implant. * Moderate or severe pain within 4 hours after stopping the PCA in the morning of the first post-operative day. Exclusion Criteria: * Another acute or chronic painful physical condition * Use of any other analgesics (within 24 hours), sedatives, or narcotic drugs as well as microsomal enzyme inducers * Inability to use and understand Visual Analog Scale and Verbal Rating Score