Upadhyay, D.K., S. Palaian, P.V. Kishore, R. Paudel, M. Prabhu, P.R. Shankar, and p Mishra. 2006. “Tramadol”. Journal of Institute of Medicine Nepal 28 (3): 57-61. https://doi.org/10.59779/jiomnepal.268.