Ketamine is a intravenous /intramuscular/oral/epidural anaesthetic drugs .it has significant analgesic effect among all the general anaesthetic ketamine doesn’t depress cardiovascular and respiratory system .it is also a sedative drug .it is a drug for pain management .ketamin raises blood pressure : So it is also a very useful drug In severe hypotension /shock.it is a central nervous system depressant Ketamine separate perception from sensation .other drug in this class is nitrous oxide.