<prompt> The following statements regarding ketamine are true except:It acts on the reticular activating system in the brain stem.It produces dissociative anaesthesia.It is useful agent in patients with hypovolemia.Its use is contraindicated in pregnancy before term.  <response>: Ketamine on intramuscular or intravenous administration produces sedation, immobility, amnesia, analgesia and a strong feeling of dissociation from the environment termed as dissociative anaesthesia. It acts on the cerebral cortex and limbic system. It can increase sympathetic activity; myocardial contractility and the cardiac output hence the blood pressure rises by 25 hence useful in hypovolemic patients. It has oxytocic action hence is contraindicated in pregnancy before term. 