Inclusion Criteria:  Adults (age 18-65 years) of American Society of Anaesthesiologists (ASA) physical status I-II Traumatic multiple fracture ribs 3 ribs or more, who will be subjected to thorough assessments including chest 3D-CT Undergoing conservative treatment (chest strappings) Intractable pain with visual analogue scale (VAS) over 6 after traditional therapies Glasgow Coma Scale (GCS) ≥ 13.  Exclusion Criteria:  Multiple traumas to body parts other than chest with an abbreviated injury scale over 3 Serious head trauma with a Glasgow coma scale lower than 13 Mechanically ventilated patients Massive hemothorax Injury to the trachea or bronchus with requirement for immediate surgery Dementia Use of corticosteroids during ICU stay Sepsis Continued use of neuromuscular blocking agents and aminoglycosides antibiotic use as they are known risk factors for ICU-acquired weakness and any known hypersensitivity Contraindication to the study drugs.