The addition of droperidol or clonidine to epidural tramadol shortens onset time and increases duration of postoperative analgesia

Phase I Safety Assessment of Intrathecal Neostigmine Methylsulfate in Humans 

David D. Hood, James C. Eisenach, Robin Tuttle · Anesthesiology · 1995 · 283 citations · Full text

Contribution of monoaminergic modulation to the analgesic effect of tramadol

Jules Desmeules, Valérie Piguet, L Collart et al. · British Journal of Clinical Pharmacology · 1996 · 238 citations · Full text

Addition of Clonidine Enhances Postoperative Analgesia from Epidural Morphine

J. Motsch, Eva Gräber, Kurt Ludwig · Anesthesiology · 1990 · 176 citations · Full text

Health Sciences, Pain Medicine, Postoperative Pain Management +13

Droperidol Causes a Dose-dependent Prolongation of the QT Interval

V. Lischke, M. Behne, Peter Doelken et al. · Anesthesia & Analgesia · 1994 · 162 citations

Hypertension, Heart Failure, Cardiac Anaesthesia +18

Direct Tramadol Application on Sciatic Nerve Inhibits Spinal Somatosensory Evoked Potentials in Rats

Yu‐Chuan Tsai, Pei‐Jung Chang, I‐Ming Jou · Anesthesia & Analgesia · 2001 · 125 citations