DR. ARJUN GOTAGUNAKI; DR. VARSHA PATIL; DR. JYOTHSNA PARANJAPE; DR. KUNAL UDAY PATIL. A Comparative Study on the Efficacy of Epidural Tramadol versus Fentanyl as Adjuvants to Ropivacaine in Postoperative Pain Management. International Journal of Pharmacy Research & Technology (IJPRT), [S. l.], v. 16, n. 2, p. 5018–5023, 2026. Disponível em: https://www.ijprt.org/index.php/pub/article/view/3133. Acesso em: 19 sep. 2026.