1Horan P,Ho I K.Comparative pharmacological and blocheml-calstudles between butorphanol and morphine[].PharrnacolBlochem Behav.1989
2Jaw SP,Hoskins B,Ho IK.Opioid antagonists and butorphanoldependence[].Pharmacol Biochem Behav.1993
3Tabedar S,Maharjan SK,Shrestha BR et al.A comparison of haemodynamic response with pethidine vs. butorphanol in open cholecystectomy cases[].Kathmandu Univ Med J(KUMJ).2004
4Laffey DA,Kay NH.Premedication with butorphanol,a comparison with morphine[].British Journal of Anaesthesia.1984
