“…This effect would possibly be related to a higher side-effect rate shown by some authors 13 , but not confirmed by this study or by other authors 3,6 . As to analgesic and motor block onset, our results are in line with other studies 12,13,29,30 , which obtained similar results with spinal clonidine. Clonidine's hemodynamic effects, usually hypotension and bradycardia, result from the activation of a 2 pre-synaptic receptors of peripheral nervous terminations, as well as from its action on brain stem and spinal cord, decreasing sympathetic outflow 1,14,33,34 .…”