ERAS gabapentin 2 human 2 postoperative pain 2 Article 1 Enhanced recovery after surgery 1 Multimodal analgesia 1 Opioid-sparing analgesia 1 Pain management 1 Postsurgical pain 1 Review 1 United States 1 aged 1 buprenorphine 1 celecoxib 1 clonidine 1 data base 1 dexamethasone 1 dexmedetomidine 1 dose response 1 drug tolerability 1 drug use 1 enhanced recovery pathway 1 epidural analgesia 1 fentanyl 1 hip replacement 1 hospital discharge 1 hospital patient 1 hospitalization 1 hydromorphone 1