Abstract
This evaluation of the sedative effects of medetomidine on general anesthesia of thoroughbreds used 12 horses. For sedation purposes, group A (6 horses) was injected with xylazine and midazolam; group B (6 horses) was injected with medetomidine. Recovery took longer in group B than in group A. For general anesthesia of thoroughbreds, therefore medetomidine is considered more effective than the combination of xylazine and midazolam.