Xylazine hydrochloride, a non-narcotic compound, is a sedative and analgesic as well as a muscle relaxant. Its sedative and analgesic activity is related to central nervous system depression. Following intramuscular administration, the clinical effects of xylazine hydrochloride are apparent within 10-15 minutes. Clinical effects are observed within 3-5 minutes of intravenous administration. A sleeplike state, the depth of which is dose-dependent, is usually maintained for 1 to 2 hours, while analgesia lasts from 15 to 30 minutes.